Differences

This shows you the differences between two versions of the page.

--- techtalk:ih:carb01r [2023/12/29 21:29]
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+++ techtalk:ih:carb01r [2023/12/29 22:29] (current)
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@@ Line 21: / Line 21: @@
 To find out which later carb you have; \\
-On 79 or later Keihin butterfly carbs, measure the venturi. 34mm = Sportster, 38mm = big twin. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1791419)) \\
+On 79 or later Keihin butterfly carbs, measure the venturi. 34mm = Sportster, 38mm = big twin. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/166738-carb-id-and-jetting-question?t=1791419)) \\
 You can cut two pieces of cereal/Kleenex box cardboard, 34mm and 38mm wide and each a few inches long each. \\
 See which best fits the most narrow part (throat) of the venturi. \\
@@ Line 47: / Line 47: @@
 ====== Low Speed System (idle circuit) ======
 The low speed system affects idle up thru about half throttle (idle, low and intermediate speeds when the throttle valve is closed or only partially open). ((1970-1978 HD Sportster FSM pg 3-60)) \\
 **76 only**; At idle, fuel enters the slow jet where it is metered. \\
@@ Line 118: / Line 117: @@
     * Turning the screw in (clockwise) leans the mixture.
     * Turning the screw out (counter-clockwise) richens the mixture.
-The pilot screw tuning is dependent on your slow speed jet size. ((83XLX of the XLFORUM http://xlforum.net/forums/showthread.php?t=770330&page=2)) \\
+The pilot screw tuning is dependent on your slow speed jet size. ((83XLX of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93436-keihin-free-flow-problem/page2?t=770330&page=2)) \\
 Needing it too far in or out for proper mixture will indicate the need for a smaller or larger low speed jet.
-|Idle Mixture Screw: L76-78 ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=2))|79 Idle Mixture Screw ((photo by spuggy of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?p=5694195&highlight=keihin#post5694195))|Idle Mixture Screw: 80-up ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=2))|
+|Idle Mixture Screw: L76-78 ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page2?t=276157&page=2))|79 Idle Mixture Screw ((photo by spuggy of the XLFORUM, annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194516-choices-choices-what-carb-for-69-xlch?highlight=keihin#post4226385))|Idle Mixture Screw: 80-up ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194516-choices-choices-what-carb-for-69-xlch?highlight=keihin#post4226385))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_1_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_buttefly_3_by_spuggy_-_annotated.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_20_by_county_fair.jpg?direct&300|}}|
 ===== Idle Speed Adjustment =====
-The idle speed adjuster is just a butterfly stop screw and it adjusts the movement on the return of the throttle cable. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=1383309&page=3)) \\
+The idle speed adjuster is just a butterfly stop screw and it adjusts the movement on the return of the throttle cable. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-spehttps://www.xlforum.net/showthread.php?t=1383309&page=3cific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194516-choices-choices-what-carb-for-69-xlch?highlight=keihin#post4226385)) \\
 Adjust the throttle stop screw to make the engine idle at the desired speed with the throttle closed. ((1970-1978 HD Sportster FSM pg 3-61)) \\
 **Notes**: \\
@@ Line 147: / Line 146: @@
     * Turn the fast idle adjusting screw in or out to set the fast idle at 1500 RPM.
-|Throttle Stop Screw (idle speed adjuster): ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=2))|
+|Throttle Stop Screw (idle speed adjuster): ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page2?t=276157&page=2))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_2_by_hopper.jpg?direct&300|}}|
 ==== Choke Shaft and Plastic Parts (76-E78) ====
 Kits were available from the MoCo for 76-78 FX & FL carbs to adapt for a fast idle cam. It was also available as a replacement for 79-up carbs. \\
 The Choke Shaft Kit is (27045-78) and the Plastic Parts kit (27046-78) as shown below (with the parts list including 3 springs, 2 clips and 2 washers). \\
 {{:techtalk:ih:carb:keihin_choke_shaft_kit_27045-78.jpg?direct&300|}} {{:techtalk:ih:carb:keihin_plastic_parts_kit_27046-78.jpg?direct&300|}} \\
 The ball under the choke lever drive must ride in the detents on the bottom of the choke lever drive. \\
 ==== Fast Idle Cam (79-up) ====
 The fast idle cam operates in conjunction with the choke to progressively raise the idle speed as the choke disc closes. ((1979-1985 Hd FSM pg 4-3)) \\
 Engine speed is increased as the choke knob is pulled out. \\
 By moving the choke knob, the choke and fast idle can be adjusted for a cold or warm engine. \\
 This should be set to 1500 RPM with the bike fully warmed up. \\
-When the choke lever is pulled out 1/4" to 1/2", it is in the fast idle position. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=71361&page=2)) \\
+When the choke lever is pulled out 1/4" to 1/2", it is in the fast idle position. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/36692-setting-the-pilot-screw-on-your-ironhead/page2?t=71361&page=2)) \\
 After starting with full choke you push it in to this setting until it is warmed up [a few minutes] then push it in the rest of the way. \\
-{{:techtalk:ih:carb:keihin_butterfly_by_mickey_t.jpg?direct&250|}} ((photo by mickey t of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073560&highlight=keihin&page=3)) {{:techtalk:ih:carb:kehien_fast_idle_cam_by_racedvl_-_annotated.jpg?direct&300|}} ((photo by racedvl of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=1791419)) \\
+{{:techtalk:ih:carb:keihin_butterfly_by_mickey_t.jpg?direct&250|}} ((photo by mickey t of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196994-this-is-the-no-name-carb-i-purchased-n-hoping-it-will-work-dor-this-season/page3?t=2073560&highlight=keihin&page=3)) {{:techtalk:ih:carb:kehien_fast_idle_cam_by_racedvl_-_annotated.jpg?direct&300|}} ((photo by racedvl of the XLFORUM, annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/166738-carb-id-and-jetting-question?t=1791419)) \\
 ===== Slow Jet =====
 Other notable names include the pilot jet or idle jet. \\
 ==== Rubber bung ====
 **L76 Sportster carbs**; \\
-The very first 1976 style Keihin carbs do not use the rubber plug beneath the slow jet. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?p=4091515&highlight=float+level#post4091515)) \\ They do not have the tiny hole going sideways through the carb body from the slow jet housing to the main jet housing. \\ So they need to suck gas up direct from the float bowl though the exposed slow jet. The slow jet was a 100 and the main was a 140 ((HD Service Bulletin #M-713 dated June 10, 1977)). \\ Check if your carb has that small hole drilled in the body. \\ If you look down into the hole where the slow jet sits it will be visible in the wall on the side where it can lead to the main jet. \\ If it does not have that hole, that carb does not use the rubber plug and can cause you to have to screw the idle mix too far open. \\
+The very first 1976 style Keihin carbs do not use the rubber plug beneath the slow jet. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140198-carb-issues-not-starting-again?highlight=float+level#post2988746)) \\ They do not have the tiny hole going sideways through the carb body from the slow jet housing to the main jet housing. \\ So they need to suck gas up direct from the float bowl though the exposed slow jet. The slow jet was a 100 and the main was a 140 ((HD Service Bulletin #M-713 dated June 10, 1977)). \\ Check if your carb has that small hole drilled in the body. \\ If you look down into the hole where the slow jet sits it will be visible in the wall on the side where it can lead to the main jet. \\ If it does not have that hole, that carb does not use the rubber plug and can cause you to have to screw the idle mix too far open. \\
 **77-up carbs**; \\
-The slow jet is under the rubber bung in the pic above. You take out the rubber bung, then unscrew the small brass jet with a screw driver that is a tight fit. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=2)) \\
+The slow jet is under the rubber bung in the pic above. You take out the rubber bung, then unscrew the small brass jet with a screw driver that is a tight fit. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page2?t=276157&page=2)) \\
 The rubber bung is essential. The bike will run really rough if it comes loose or falls out. \\
-Looking at the carb upside down the passage will be drilled below the main jet and above the pilot jet. ((ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1423900)) \\
+Looking at the carb upside down the passage will be drilled below the main jet and above the pilot jet. ((ryder rick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/132811-rubber-plug-covering-slow-jet?t=1423900)) \\
 With the plug installed, the pilot jet draws fuel from and through the main jet. \\
 You must run with the plug in place or the main jet will be bypassed by the drilled passage and it will run very rich. \\
 **Correction of Lean Mixture Problems Due to the Rubber Bung** \\
-Sometimes, the black plug in the low speed jet is too long and should be trimmed off to allow more fuel in the low speed side. ((oldnavy of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2)) \\
+Sometimes, the black plug in the low speed jet is too long and should be trimmed off to allow more fuel in the low speed side. ((oldnavy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2)) \\
 Trim off as much as needed to still hold it in without falling out. Per TSB #707, correct by either modifying or replacing the plug. ((HD TSB #M707 dated December 1, 1976)) \\
 Either cut a plug so it is 5mm (.20") from shoulder to tip or replace it with a new plug (27385-76). Refer to bulletin 694 for disassembly and assembly procedure to remove and replace plug. \\
@@ Line 190: / Line 187: @@
 Interestingly, the original big twin models all had this plug when they swapped from the Bendix to the Keihin carb.  ((HD TSB #694 dated November 7, 1975)) \\
 It is not clear why the L76 Sportster carb was different. \\
-{{:techtalk:ih:carb:keihin_butterfly_carb_3_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=2)) {{:techtalk:ih:carb:77-78_keihin_carb_1_by_pala_-_annotated.jpg?direct&200|}} ((photo by pala of the XLFORUM http://xlforum.net/forums/showthread.php?t=1771280&highlight=keihin+bowl&page=2)) \\
+{{:techtalk:ih:carb:keihin_butterfly_carb_3_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page2?t=276157&page=2)) {{:techtalk:ih:carb:77-78_keihin_carb_1_by_pala_-_annotated.jpg?direct&200|}} ((photo by pala of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/164694-keihin-carb-issues/page2?t=1771280&highlight=keihin+bowl&page=2)) \\
 ==== Slow jet ====
 You might have to grind the sides off a screwdriver to get it to go up inside the hole to the jet. \\
 If you have anything other than factory original exhaust and air filter, you will most likely need to go up one or two sizes in slow speed jet. \\
 If your idle mixture screw works best more than 1-1/4 turns open, you need a bigger low speed jet. \\
 If your bike spits back through the carb at all, you need a bigger low speed jet. \\
-If your slow jet is too small, the engine misfires on acceleration. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=4)) \\
+If your slow jet is too small, the engine misfires on acceleration. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page4?t=276157&page=4)) \\
 Click here for [[techtalk:ih:carb01#carburetors_by_bike_year_model|Keihin butterfly carb standard jet sizes]] installed in Sportster carbs in the Sportsterpedia.  \\
 Fitting an 80 model carb, for instance, will make it run much better. Later 79-onwards and those with 34mm carbs have smaller jets. \\
@@ Line 209: / Line 205: @@
 You drill the jet very carefully, one size at a time by hand, twirling the jet down over the drill gradually. \\
 Do not use an electric drill, it will make a big hole and possibly break the drill bit. \\
-Buy 2 small jets, and a good drill index (number, letter, fractional or the metric equivalent). ((forqueue of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=5)) \\
+Buy 2 small jets, and a good drill index (number, letter, fractional or the metric equivalent). ((forqueue of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page5?t=276157&page=5)) \\
 Drill out the small jet one size at a time until you become too rich. Drill out the remaining jet 1 size down. \\
 The right size slow speed jet is the most important factor in getting a good idle, starting, running up to half throttle and stopping carb farts. \\
 This is a slow jet and jet hand-drill (or pin vise). \\
-{{:techtalk:ih:carb:keihin_butterfly_carb_4_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=2)) \\
+{{:techtalk:ih:carb:keihin_butterfly_carb_4_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page2?t=276157&page=2)) \\
 ====== Mid-range Circuit / Idle Transfer Ports ======
 As the throttle valve opens, the air / fuel mixture from the slow jet is drawn into the venture through the idle transfer ports. \\
 When the throttle valve uncovers the midrange port, raw fuel from the float chamber is also drawn into the engine. \\
-Another thing that affects low speed running, mostly as you crack the throttle open from idle, is the bypass ports. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3)) \\
+Another thing that affects low speed running, mostly as you crack the throttle open from idle, is the bypass ports. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3)) \\
 This is a row of four tiny holes in the top of the carb, just in front of the idle mixture hole, directly below the idle mixture screw. \\
@@ Line 226: / Line 221: @@
 So as the throttle opens from idle, more gas is allowed in to match the extra air flowing in. \\
-The ports in the carb venturi are made active as follows as you open the throttle: ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=93242)) \\
+The ports in the carb venturi are made active as follows as you open the throttle: ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/40980-carb-tuning-the-andrews-high-flow-accelerator-pump-kit?t=93242)) \\
   - Idle port, controlled by pilot screw
   - 1st of 4 idle transfer ports are active at idle.
@@ Line 244: / Line 239: @@
 Apply a minimal amount only to the joints between the edges of the plugs and the casting. \\
-|Idle transfer ports inside. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Idle transfer ports outside. ((photo by Civil War Harley of the XLFORUM, annotated by Hippysmack  http://xlforum.net/forums/showthread.php?t=2002662&highlight=keihin+accelerator+pump&page=2))|
+|Idle transfer ports inside. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Idle transfer ports outside. ((photo by Civil War Harley of the XLFORUM, annotated by Hippysmack  https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187542-keihin-carb-repair/page2?t=2002662&highlight=keihin+accelerator+pump&page=2))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_5_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:welch_plug_3_by_civil_war_harley.jpg?direct&200|}}|
@@ Line 251: / Line 246: @@
 Fuel is metered by the main jet and enters the main jet bleed tube where it mixes with air entering through the main jet air passage. \\
 This air/fuel mixture then enters the venture from the main nozzle. \\
 ===== Main Jet =====
 The main jet has no adjustment. Fuel is metered by the main jet during high speed operation. \\
@@ Line 260: / Line 256: @@
 All year Keihin jet locations: \\
-{{:techtalk:ih:carb:keihin_10_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\
+{{:techtalk:ih:carb:keihin_10_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?s=9e387afdd8bddbd4444d18324d2d215c&t=1760294&page=3)) \\
 ===== Installing an Adjustable Main Jet (L76-87) =====
 There is an adjustable main jet available from J&P Cycles or others. \\
 These work great and you don't have to fool around jet guessing whether you have the right size main jet or not. \\
-They are simple to adjust. Just wind it up to about 65 MPH and run it in until it misses and back it out about a full turn. ((oldnavy of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2)) \\
+They are simple to adjust. Just wind it up to about 65 MPH and run it in until it misses and back it out about a full turn. ((oldnavy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2)) \\
 This kit can be purchased online. It comes with an installation guide and index pointer. \\
@@ Line 279: / Line 275: @@
 The bowl is once again removed and a 1/16"-1/8" pilot hole is drilled followed by a 15/64" bit. \\
 After checking for burrs, removing the index tool and guide and cleaning up, the adjustable jet is installed in the float bowl. \\
-(partially unscrew the small 'T' handle so that the needle in the adjustable jet is not exposed to accidental damage) \\
+(partially unscrew the small "T" handle so that the needle in the adjustable jet is not exposed to accidental damage) \\
 Remove the nut from the adjustable jet, insert the jet through the 15/64" hole drilled earlier. \\
-Then re-tighten the bowl and gently screw in the 'T' handle to the needle seat and then back it out 4 turns. \\
+Then re-tighten the bowl and gently screw in the "T" handle to the needle seat and then back it out 4 turns. \\
 Finer tuning can be achieved by reading the spark plugs and small adjustments to the “T” handle. \\
 This adjustable jet eliminates the chore of carrying and continually changing different main jets with every change in exhaust system or air cleaner. \\
-The hole in the bowl for the 'T' handle jet has to be indexed correctly in order for this to work. \\
+The hole in the bowl for the "T" handle jet has to be indexed correctly in order for this to work. \\
 The adjustable main jet is designed to operate in conjunction with a 1.80 main jet included with the kit. \\
-Make sure you record or remember the number of turns off the seat and back off the 'T' handle before removing the float bowl later. \\
+Make sure you record or remember the number of turns off the seat and back off the "T" handle before removing the float bowl later. \\
 This will help prevent needle / jet interference when the float bowl is reinstalled. \\
 For initial adjustment (standard pipes and A/C) it's recommended that the adjustment needle be backed out four (4) turns from the seat.
@@ Line 293: / Line 289: @@
 |{{:techtalk:ref:carb:kehien_butterfly_carb_1_by_leucadiaguit_-_cropped.jpg?direct&300|}}|{{:techtalk:ref:carb:kehien_butterfly_carb_2_by_leucadiaguit_-_cropped.jpg?direct&300|}}|
 ======  Accelerator Pump System ======
@@ Line 328: / Line 323: @@
 \\
 ===== Accel Pump Check Valves =====
-Keihin carbs have 2 check valves in the accel pump circuit. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1964931)) \\
+Keihin carbs have 2 check valves in the accel pump circuit. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/182361-keihin-check-valve?t=1964931)) \\
   - The inlet check ball. \\ It's captive in the pump cover pn (27364-76}. You can hear it when you shake the cover.
   - The outlet weighted needle (this is the one that resembles a float inlet valve). \\ This valve is captive in the bowl casting (inside the spray nozzle). You can hear it when you shake the bowl.
@@ Line 341: / Line 336: @@
 You can see a little hole in the passage from the pump to the nozzle. It's on -76 and -76A bowls only. The -77 don't have that hole.
 Additionally, -76 bowls use a #100 (.040") discharge nozzle, -76a bowls use a #80 (.032") and -77 bowls use a #45 (.018") nozzle. \\
-{{:techtalk:ih:carb:keihin_bowl_accel_check_valves_1_by_dr_dick.jpg?direct&300|}} ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1964931)) {{:techtalk:ih:carb:keihin_bowl_accel_check_valves_2_by_dr_dick.jpg?direct&300|}} ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1964931)) \\
+{{:techtalk:ih:carb:keihin_bowl_accel_check_valves_1_by_dr_dick.jpg?direct&300|}} ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/182361-keihin-check-valve?t=1964931)) {{:techtalk:ih:carb:keihin_bowl_accel_check_valves_2_by_dr_dick.jpg?direct&300|}} ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/182361-keihin-check-valve?t=1964931)) \\
 ===== Accel Pump Jet =====
 How fast the pump's gas is delivered to the carb depends on the strength of the spring pushing on the pump rod and the size of the pump jet. \\
 You can control the rod throw, and therefore the volume with the limit screw (or the one you've added on later carbs). \\
@@ Line 356: / Line 350: @@
 And you can't get the earlier -77 anymore (outside of occasional NOS or Ebay items). But you can solder up the 80 and re-drill to a smaller size. \\
 A #76 drill bit will give you an app size 50 jet. You may have to clean the solder out of the large hole but that's easily done. \\
-|Accelerator pump jet location: ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Note hole in jet. ((photo by Brendan of the XLFORUM, cropped by Hippysmack http://xlforum.net/forums/showthread.php?p=5759323&highlight=keihin+butterfly#post5759323))|
+|Accelerator pump jet location: ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Note hole in jet. ((photo by Brendan of the XLFORUM, cropped by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197291-help-identifying-which-keihin-butterfly-version-i-have-and-necessary-jetting?highlight=keihin+butterfly#post5759323))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_11_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb6_by_brendan_-_cropped.jpg?direct&300|}}|
@@ Line 378: / Line 372: @@
 The accelerator pump adjusting screw is missing in the second pic below. Once removed, it gives full pump stroke all the time. \\
-|Early accelerator pump adjusting screw. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Accelerator pump adjusting screw removed. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=247853))|Later pump mech assembly, no screw.|
+|Early accelerator pump adjusting screw. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Accelerator pump adjusting screw removed. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/53546-keihin-carburetor-idle-adjust-accelerator-pump-pics?t=247853))|Later pump mech assembly, no screw.|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_10_by_hopper.jpg?direct&300 |}}|{{:techtalk:ih:carb:keihin_butterfly_carb_22_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:later_keihin_butterfly_accelerator_pump_mech.jpg?direct&300|}}|
 ===== Check the pump nozzle aim =====
@@ Line 387: / Line 380: @@
 -78 float bowl (27395-77) with short accel pump nozzle. \\
 -85 float bowl (27890-78) with tall accel pump nozzle. \\
-==== 79 and later 34mm Keihin butterfly carbs ====
-Do not re-aim the 79-up accelerator pump as recommended in Joe Minton's magazine article below. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?p=2003742#post2003742)) \\
+==== 79 and later 34mm Keihin butterfly carbs ====
+Do not re-aim the 79-up accelerator pump as recommended in Joe Minton's magazine article below. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page6#post1575878)) \\
 The accel pump jet in 79-up carbs is taller and right up to the height of the choke plate. \\
 So there is no need for the extra notch in the plate and or to adjust the aim of the nozzle. \\
@@ Line 399: / Line 392: @@
 As long as the jet is aimed directly at the rear cylinder roughly equal amounts of fuel will be directed to each cylinder by the force of the air stream. \\
 So, if you are running a Keihin butterfly carb, the fuel should go thru the middle of the cutout in the choke plate with the choke fully open. \\
-{{:techtalk:ih:carb:accpumpaim_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack, redrawn from IronMick's drawing http://xlforum.net/forums/showthread.php?p=2003742#post2003742)) \\
+{{:techtalk:ih:carb:accpumpaim_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack, redrawn from IronMick's drawing https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page6#post1575878)) \\
 ==== 76-78 38mm Keihin's ====
@@ Line 419: / Line 412: @@
 **Caution**: \\
 It is possible to break the nozzle when trying to remove it. Replacements from J&P etc. may still be available. \\
-As a precaution, you can heat the float bowl gently and evenly. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=247853&page=3)) \\
+As a precaution, you can heat the float bowl gently and evenly. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/53546-keihin-carburetor-idle-adjust-accelerator-pump-pics/page3?t=247853&page=3)) \\
 The aluminum will expand more than the brass nozzle, so the fit will become loose and make it easier to turn the nozzle. \\
 You can heat it with a heat gun, a good hairdryer or even drop the float bowl in a pot of boiling water for a few minutes to heat it up. \\
-|Choke butterfly notch. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Accel pump spray path. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|
+|Choke butterfly notch. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Accel pump spray path. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_12_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_13_by_hopper.jpg?direct&300|}}|
@@ Line 429: / Line 422: @@
 The pencil shows the direction the jet hole was facing before adjustment. \\
-|Before adjusting (factory position). ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|
+|Before adjusting (factory position). ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_14_by_hopper.jpg?direct&300|}}|
@@ Line 441: / Line 434: @@
 Any wiring that that may get too hot / catch fire doesn't need gas nearby. \\
-|After adjusting. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Accelerator pump from the outside. \\ (see caution above) ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|
+|After adjusting. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Accelerator pump from the outside. \\ (see caution above) ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_15_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_16_by_hopper.jpg?direct&300|}}|
 ===== Andrews High Flow Accelerator Pump (Keihin butterfly) =====
 -up 34mm Keihin carbs will not fill there accelerator pumps as quickly as the 76-78 38mm ones. ((Joe Minton Article "Tuning HD's Keihin Carburetors")) \\
 The earlier pump would refill in about 1/2 second. The later one takes three seconds. \\
@@ Line 453: / Line 445: @@
 Actually, if you can find a 38mm pump and drill the hole in your carb body, you'll have the old style accel pump. \\
-On 1980-1988 Keihin carbs, the stock accelerator pump is restricted by eliminating the check valves in the pump. A high flow accelerator pump puts them back. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=93242)) \\
+On 1980-1988 Keihin carbs, the stock accelerator pump is restricted by eliminating the check valves in the pump. A high flow accelerator pump puts them back. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/40980-carb-tuning-the-andrews-high-flow-accelerator-pump-kit?t=93242)) \\
 The result is increased fuel flow through the pump and greatly improved low end and mid range throttle response. \\
-The Keihin butterfly carb already has an accelerator pump, so the Andrews high-flow pump body just replaces the stock one on the bottom of the float bowl. ((83XLX of the XLFORUM http://xlforum.net/forums/showthread.php?t=2064358)) \\
+The Keihin butterfly carb already has an accelerator pump, so the Andrews high-flow pump body just replaces the stock one on the bottom of the float bowl. ((83XLX of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/192675-andrews-accelerator-pump-for-keihin-carb-butterfly?t=2064358)) \\
 There is one on the [[https://vtwin.parts/index.php?_route_=supplier/v-twin/sportster-1952-up/fuel-air-system/carburetor/rebuild-kits/harley-davidson-indian-motorcycle-keihin-carburetor-accelerator-pump-kit-35-9050&limit=50|V-twin website]] called the Flowmaster accelerator pump. \\
 It has a V-twin part number of 35-9050, Manufacturer Keihin, Part Number: 269050. \\
@@ Line 474: / Line 466: @@
   * Dimensions: 5"x3"x1"; 0.3 pounds
-A high flow accelerator pump is also a great all around upgrade for these carbs. ((oldnavy of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2)) \\
+A high flow accelerator pump is also a great all around upgrade for these carbs. ((oldnavy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2)) \\
-{{:techtalk:ref:carb:andrews_accel_pump_1_by_paraord.jpg?direct&300|}} ((photo by paraord of the XLFORUM http://xlforum.net/forums/showthread.php?p=3908971)) {{:techtalk:ref:carb:andrews_accel_pump_2_by_paraord.jpg?direct&300|}} ((photo by paraord of the XLFORUM http://xlforum.net/forums/showthread.php?p=3908971)) \\
+{{:techtalk:ref:carb:andrews_accel_pump_1_by_paraord.jpg?direct&300|}} ((photo by paraord of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/134111-so-i-guess-i-already-had-an-andrews-accelerator-pump-kit#post2863274)) {{:techtalk:ref:carb:andrews_accel_pump_2_by_paraord.jpg?direct&300|}} ((photo by paraord of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/134111-so-i-guess-i-already-had-an-andrews-accelerator-pump-kit#post2863274)) \\
 **How the High Flow Accelerator Pump should be installed**: ((Andrews Products, Inc. INSTALLATION INSTRUCTIONS
@@ Line 482: / Line 474: @@
   - Clean any fuel residue from the bowl assembly and remove the stock accelerator pump housing. \\ It is held in place with three screws but one of them already has been removed with the bowl.
   - Position the bowl upside down for drilling a single hole through the bottom.
-  - Any drill of approximately 1/16 diameter will be quite satisfactory. \\ The exact location for this hole is already marked with a dimple on the bottom of the float bowl casting as shown in photo below. \\ {{:techtalk:ref:carb:keihin_butterfly_carb5.2_by_brendan_-_annotated.jpg?direct&300|}} ((photo by brendan of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?p=5759323&highlight=keihin+butterfly#post5759323))
+  - Any drill of approximately 1/16 diameter will be quite satisfactory. \\ The exact location for this hole is already marked with a dimple on the bottom of the float bowl casting as shown in photo below. \\ {{:techtalk:ref:carb:keihin_butterfly_carb5.2_by_brendan_-_annotated.jpg?direct&300|}} ((photo by brendan of the XLFORUM, annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197291-help-identifying-which-keihin-butterfly-version-i-have-and-necessary-jetting?highlight=keihin+butterfly#post5759323))
   - Feed the drill through until it breaks out into the float chamber. \\ Don’t worry if the hole breaks into either a cross drilled passage or through the actual bottom of the bowl. \\ The location is not critical as long as fuel can feed through into the accelerator pump.
   - Thoroughly clean any drill chips from the bowl. There is a small bypass hole in the bottom of the bowl which does not have to be plugged. \\ Several earlier magazine articles have recommended plugging this hole but there will be no measurable benefit from doing so.
@@ Line 490: / Line 482: @@
 ===== Alternative using CV accelerator pump =====
+It looks like Keihin made all these covers so any of the basic raw castings can have additional operations incorporated to be used in any of their many configurations. ((chevelle of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/188693-keihin-andrews-accelerator-pump-high-flow-cover?t=2009248)) \\
-It looks like Keihin made all these covers so any of the basic raw castings can have additional operations incorporated to be used in any of their many configurations. ((chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=2009248)) \\
 The stock pump cover for non CV Harley carbs (2-2) uses the same passage for supply and pump shot. \\
 The high flow cover uses separate passages for supply and pump shot (4-2). \\
@@ Line 504: / Line 495: @@
 Note: All orifices in covers are the same. \\
-{{:techtalk:ref:carb:acel_pumps_1_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=2009248)) {{:techtalk:ref:carb:acel_pumps_2_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=2009248)) {{:techtalk:ref:carb:acel_pumps_3_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM http://xlforum.net/forums/showthread.php?t=2009248)) \\
+{{:techtalk:ref:carb:acel_pumps_1_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/188693-keihin-andrews-accelerator-pump-high-flow-cover?t=2009248)) {{:techtalk:ref:carb:acel_pumps_2_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/188693-keihin-andrews-accelerator-pump-high-flow-cover?t=2009248)) {{:techtalk:ref:carb:acel_pumps_3_by_chevelle.jpg?direct&300|}} ((photo by chevelle of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/188693-keihin-andrews-accelerator-pump-high-flow-cover?t=2009248)) \\
 ====== Float Level Adjustment ======
@@ Line 524: / Line 515: @@
 ==== 76-78 Sportster carbs ====
 Two positions of the float valve must be set; The valve fully closed and The valve fully open. \\
 Setting the closed position lower will tend to make the carb act lean at low speed. \\
@@ Line 538: / Line 528: @@
 The actual adjustments are made by carefully bending the two tabs of the metal clip on the float assembly until these two dimensions are achieved. \\
-|Setting 'fully closed' position. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|Setting 'fully open' position. ((photo by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=276157&page=3))|
+|Setting 'fully closed' position. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|Setting 'fully open' position. ((photo by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/55576-how-to-tune-keihin-carbs-links/page3?t=276157&page=3))|
 |{{:techtalk:ih:carb:keihin_butterfly_carb_18_by_hopper.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_carb_19_by_hopper.jpg?direct&300|}}|
@@ Line 546: / Line 536: @@
 The valve should be fully closed with a measurement of .63"-.67" (16mm-17mm) from the top of the float to the bowl mounting surface. ((1979-1985 HD Sportster FSM pg 4-8)) \\
-{{:techtalk:ih:carb:keihin_7_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM http://xlforum.net/forums/showthread.php?t=1760294&page=3))
+{{:techtalk:ih:carb:keihin_7_by_county_fair.jpg?direct&300|}} ((photo by County Fair of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/163764-rebuilding-the-stock-keihin/page3?t=1760294&page=3))
 ====== Heat Spacer ======
 [[techtalk:ih:carb01#heat_spacer_insulator_block|Click here to see Heat Spacer / Insulator Block]] on the main IH carb page. \\
 ====== Vacuum Ports (83-up) ======
 **VOES port**. \\
@@ Line 575: / Line 566: @@
 The line to the gas tank on XLX and XLH models is hooked to the vent tube on the bottom of the tank. \\
 On XLS models, it's hooked to the vent on the gas filler neck. \\
-|1983 Keihin butterfly - single vacuum port. ((photo by RatRodder of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=1670881))|1984-up Keihin butterfly - dual vacuum ports. ((photo by froddy of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=861684&page=2))|
+|1983 Keihin butterfly - single vacuum port. ((photo by RatRodder of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/155987-1980-carburetor-help?threadid=1670881))|1984-up Keihin butterfly - dual vacuum ports. ((photo by froddy of the XLFORUM, annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/100199-84-kiehin-carb-not-cv-exploded-view/page2?t=861684&page=2))|
 |{{:techtalk:ih:carb:83_keihin_butterfly_carb_by_ratrodder.jpg?direct&300|}}|{{:techtalk:ih:carb:keihin_butterfly_off_84_pic_1_by_froddy_-_annotated.jpg?direct&300|}}|
@@ Line 583: / Line 574: @@
 ===== Altitude and Ambient Temps =====
-A Carb works by mixing air and fuel into a vaporous mixture. We want the ideal mixture so the bike runs well. ((stevo of the XLFORUM http://xlforum.net/forums/showthread.php?t=49078)) \\
+A Carb works by mixing air and fuel into a vaporous mixture. We want the ideal mixture so the bike runs well. ((stevo of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/29446-read-this-first-jetting-101?t=49078)) \\
 Unfortunately it's not quite simple as a carburetor mixes air by a set volume to set the amount of fuel. \\
 The amount of oxygen density in that set amount of air varies and this is what gives variations in mixture due to differing conditions. \\
@@ Line 612: / Line 603: @@
 The opposite is also true. \\
-Hotter Air = Less Oxygen → Richer Mix ((stevo of the XLFORUM http://xlforum.net/forums/showthread.php?t=49078)) \\
+Hotter Air = Less Oxygen → Richer Mix ((stevo of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/29446-read-this-first-jetting-101?t=49078)) \\
 Colder Air = More Oxygen → Leaner Mix \\
 Higher Barometric Pressure (Low Altitude) = More Oxygen → Leaner Mix \\
@@ Line 618: / Line 609: @@
 Higher Humidity = Less Oxygen → Richer Mix \\
 Lower Humidity = More Oxygen → Leaner Mix \\
 ===== Fuel overflow =====
-The overflow tube is a safety feature in case the float needle does not prevent flow and the bowl gets full. ((IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071025)) \\
+The overflow tube is a safety feature in case the float needle does not prevent flow and the bowl gets full. ((IXL2Relax of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/194773-carburetor-plug?t=2071025)) \\
 It prevents the fuel from being pushed out of the carb float bowl, into the carb / manifold, and filling the cylinders (or crankcase) with the overflowing fuel. \\
@@ Line 628: / Line 620: @@
 Then watch for gas to rise in the hose with the engine running at different throttle levels. \\
-{{:techtalk:ih:carb:b83b_keihin_float_bowl.jpg?direct&250|}} ((B83B Keihin Float Bowl)) {{:techtalk:ih:carb:overflow_fitting_by_blackace.jpg?direct&300|}} ((photo by BlackAce of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071025)) \\
+{{:techtalk:ih:carb:b83b_keihin_float_bowl.jpg?direct&250|}} ((B83B Keihin Float Bowl)) {{:techtalk:ih:carb:overflow_fitting_by_blackace.jpg?direct&300|}} ((photo by BlackAce of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/194773-carburetor-plug?t=2071025)) \\
 **Check for**: \\
   * **Worn or stuck or improper float valve**.
-    * If gas overflows when you turn the gas on, rap the side of the float bowl sharply with a small wrench or pliers. \\ This may dis-lodge what is causing the hang up.  If that does not work, remove the float bowl and float and do a close inspection. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=770330))
+    * If gas overflows when you turn the gas on, rap the side of the float bowl sharply with a small wrench or pliers. \\ This may dis-lodge what is causing the hang up.  If that does not work, remove the float bowl and float and do a close inspection. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93436-keihin-free-flow-problem?t=770330))
-    * Replacing the float needle is usually one of the first thoughts but that may not always be the answer. \\ If you replaced the float needle with a new one from a kit, that could be the problem. Try re-installing the old one. \\ It's good to check the float height every time you remove the float bowl, as the last step before re-installing. \\ It is too easy to touch the float a little too hard and set it off. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=770330))
+    * Replacing the float needle is usually one of the first thoughts but that may not always be the answer. \\ If you replaced the float needle with a new one from a kit, that could be the problem. Try re-installing the old one. \\ It's good to check the float height every time you remove the float bowl, as the last step before re-installing. \\ It is too easy to touch the float a little too hard and set it off. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93436-keihin-free-flow-problem?t=770330))
-    * If the problem is crud, then it can often be fixed at least temporarily by partially emptying the float bowl. ((Ironmick of the XLFORUM http://xlforum.net/forums/showthread.php?t=507935&page=2)) \\ While running, shut off the fuel valve, run the bike until it begins to sputter, then turning on the fuel. \\ The sudden rush of fuel may dislodge the crud and you are good to go for a while. This can be done either while riding or while just idling. \\ This should wash out debris in the float valve / seat.
+    * If the problem is crud, then it can often be fixed at least temporarily by partially emptying the float bowl. ((Ironmick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/73165-tube-running-from-carb-leaking/page2?t=507935&page=2)) \\ While running, shut off the fuel valve, run the bike until it begins to sputter, then turning on the fuel. \\ The sudden rush of fuel may dislodge the crud and you are good to go for a while. This can be done either while riding or while just idling. \\ This should wash out debris in the float valve / seat.
   * **Damage or debris around valve seat**.
   * **Too high float level**. \\ See [[techtalk:ih:carb01r#float_level_adjustment|Float level adjustment]] above.
   * **Worn float mounting tabs, float pin or loose float retaining screw**.
   * **Cracked or damaged overflow tube in the float bowl**.
-    * Check for a leak at the bottom of the stand tube in the float bowl. ((Wedge of the XLFORUM http://xlforum.net/forums/showthread.php?t=1383344)) \\ With the float bowl in hand, fill the bowl with anything (water if you don't want gas in your mouth) and blow into the stand tube. \\ Look for bubbles around the base of it. If it bubbles, you can epoxy it. \\ Get it good and clean first, and rinse it off with alcohol before epoxy, and it will hold up for a decent amount of time. \\ If the tube will come out then you can epoxy it even easier. Just put a ring of epoxy around the end of the tube. \\ While holding the bowl upside down, insert the tube upwards so you do not drip epoxy into the hole. \\ Twist it a bit, stand the bowl upright and make sure you have a good ring of epoxy around the tube at the bottom.
+    * Check for a leak at the bottom of the stand tube in the float bowl. ((Wedge of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/130863-keihin-carb-problem-heavy-fuel-leak?t=1383344)) \\ With the float bowl in hand, fill the bowl with anything (water if you don't want gas in your mouth) and blow into the stand tube. \\ Look for bubbles around the base of it. If it bubbles, you can epoxy it. \\ Get it good and clean first, and rinse it off with alcohol before epoxy, and it will hold up for a decent amount of time. \\ If the tube will come out then you can epoxy it even easier. Just put a ring of epoxy around the end of the tube. \\ While holding the bowl upside down, insert the tube upwards so you do not drip epoxy into the hole. \\ Twist it a bit, stand the bowl upright and make sure you have a good ring of epoxy around the tube at the bottom.
   * **Damaged bowl gasket / O-ring**.
   * **Loose bowl screws**.
@@ Line 656: / Line 648: @@
   * **Excess or sloppy fuel from accelerator pump**.
   * **Improper fast idle adjustment on 79-up carbs**:
-    * A fast idle can be caused by the idle not being set when the bike is HOT. ((ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2))
+    * A fast idle can be caused by the idle not being set when the bike is HOT. ((ryder rick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2))
     * A fast idle can also be caused by an advance mechanism that is not functioning correctly. \\
   * **Mechanical issues with choke or throttle shaft / parts**.
@@ Line 662: / Line 654: @@
     * Insure the fuel hose isn't touching a head / cylinder to add extra heat to the fuel.
     * Consider installing a heat spacer between the carb and manifold. \\ See [[techtalk:ih:carb01#heat_spacer_insulator_block|Heat Spacer / Insulator Block]]
 ===== Poor acceleration =====
@@ Line 683: / Line 674: @@
 ===== Rich or Lean? =====
-A lean idle mixture will have idle hang before settling in after a throttle blip. ((xl2000883/1200 of the XLFORUM http://xlforum.net/forums/showthread.php?p=4889745#post4889745)) \\
+A lean idle mixture will have idle hang before settling in after a throttle blip. ((xl2000883/1200 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/166496-timing-with-voes#post3553920)) \\
 A rich idle mixture will have idle dip low and then increase after a throttle blip. \\
 A good setting will have rpm drop to idle and just sit there. \\
@@ Line 689: / Line 680: @@
 ===== Running Lean =====
-The main causes of carb farts are lean mixture, retarded spark and tight pushrod clearances. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=71361)) \\
+The main causes of carb farts are lean mixture, retarded spark and tight pushrod clearances. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/36692-setting-the-pilot-screw-on-your-ironhead?t=71361)) \\
 During the mid 1979 model season, HD makes a recommendation to dealers for corrective measures regarding the carburetion and [[techtalk:ih:engctl01#prestolite_electronic_ignition_system|ignition system]] on (1100, 1200 and 1340cc) models with emissions control design changes. They operate with leaner air/fuel mixtures and are more sensitive to carburetor mixture settings / ignition spark. ((HD Service Bulletin #M-739 dated November 3, 1978)). \\
@@ Line 700: / Line 691: @@
   * **Symptoms**:
     * Spitting / backfire thru the carb.
-    * Inconsistent idle. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1526333&highlight=float+level&page=8))
+    * Inconsistent idle. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140763-kiehin-buttetfly-tune/page8?t=1526333&highlight=float+level&page=8))
-    * Slow return to idle. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1526333&highlight=float+level&page=11)) \\
+    * Slow return to idle. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140763-kiehin-buttetfly-tune/page11?t=1526333&highlight=float+level&page=11)) \\
     * Increasing idle. \\  Once it heats up a bit the leak starts and without countering it with more gas it dies. \\ If the mixture thins, the engine starves and tries to pull more fuel and the leaner it gets the faster the idle until it quits.
-    * Backfiring can be caused by bad plugs. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?p=4091515&highlight=float+level#post4091515)) \\ Use standard OEM style plugs and buy a box of them until you get it sorted out. \\ If you have electronic ignition, you must use resistor plugs. \\ Start with a small gap, .025 and increase gap as you are able, electronic can go as high as .045.
+    * Backfiring can be caused by bad plugs. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140198-carb-issues-not-starting-again?highlight=float+level#post2988746)) \\ Use standard OEM style plugs and buy a box of them until you get it sorted out. \\ If you have electronic ignition, you must use resistor plugs. \\ Start with a small gap, .025 and increase gap as you are able, electronic can go as high as .045.
-    * Air / exhaust gas blowing out the carb is a timing issue. An intake valve may be open when it should be closed. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1520303&highlight=float+level&page=3)) \\ You'll need to pull the gearcase (cam) cover and check the timing marks on the cams. \\ If you have not had this cover off before, be sure to remove the pushrods first.
+    * Air / exhaust gas blowing out the carb is a timing issue. An intake valve may be open when it should be closed. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/140198-carb-issues-not-starting-again/page3?t=1520303&highlight=float+level&page=3)) \\ You'll need to pull the gearcase (cam) cover and check the timing marks on the cams. \\ If you have not had this cover off before, be sure to remove the pushrods first.
     * Running hot can be caused by vacuum leaks or bad ignition events.
   * **Causes**:
@@ Line 715: / Line 706: @@
     * Stopped up or poor flowing air cleaner. Make sure it's getting plenty of air. \\ If you are running the 72 air cleaner backing plate, the outside of it should fit to the size of the air cleaner. \\ The 77 and later backing plates had an air horn and they weren't getting enough air.
     * Retarded spark timing is usually from a worn out auto advance unit in the ignition allowing too much retard at idle.
-      * Running the ignition timing slightly advanced is good. ((oldnavy of the XLFORUM http://xlforum.net/forums/showthread.php?t=877868&page=2)) \\ With points, we used to run them advanced up to 8-10 degrees so that when the points wore, they would still be in an acceptable running time. \\ With electronic ignition, the timing never changes so 2-4 degrees advanced is about right. \\ Time it with a light and run the motor up to full advance (about 2500 RPM).
+      * Running the ignition timing slightly advanced is good. ((oldnavy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/101363-keihin-butterfly-accelerator-adjustments/page2?t=877868&page=2)) \\ With points, we used to run them advanced up to 8-10 degrees so that when the points wore, they would still be in an acceptable running time. \\ With electronic ignition, the timing never changes so 2-4 degrees advanced is about right. \\ Time it with a light and run the motor up to full advance (about 2500 RPM).
     * Pushrod adjustment can also cause it and is easy to check.
   * **Testing for air leaks**.
@@ Line 723: / Line 714: @@
     * Propane is the cleanest choice.
       * You have to spray a lot of WD-40 and it will leaves a mess.
-      * For a test, spray some into the air cleaner. \\ The idle speed will go down, perhaps stall the engine, right away. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=71361&page=3))
+      * For a test, spray some into the air cleaner. \\ The idle speed will go down, perhaps stall the engine, right away. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/36692-setting-the-pilot-screw-on-your-ironhead/page3?t=71361&page=3))
       * If there is a leak you will get a slow down of the idle speed.
       * Technically, any change (increase or decrease) in RPM would indicate an air leak.
       * The propane is nice and neat, and has finer particles so it should find smaller leaks.
-      * If the idle raises on it's own then let the engine warm up before doing the test. ((brianbbs67 of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769275&highlight=air+leaks#post5769275)) \\ When the rpms start to tic up, start spraying around every carb and intake connection to see if you can find the leak.
+      * If the idle raises on it's own then let the engine warm up before doing the test. ((brianbbs67 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/197613-xlch-idle-issues-weird?highlight=air+leaks#post4327603)) \\ When the rpms start to tic up, start spraying around every carb and intake connection to see if you can find the leak.
 ===== Poor road performance =====
@@ Line 791: / Line 781: @@
 ====== Helpful Links ======
 **Video**: \\
-Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs: ((Used by permission - SportsterPaul at the XLForum - http://xlforum.net/forums/showthread.php?t=2055701))
+Here are some excellent videos of servicing the pre-CV Keihin Butterfly carbs: ((Used by permission - SportsterPaul at the XLForum - https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/192176-keihin-butterfly-carb-rebuild-videos?t=2055701))
   * [[https://youtu.be/f_Ek37GEEN4|#1 - Tips and tricks.]]\\

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