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techtalk:ih:carb01 [2019/05/20 16:36]
hippysmack [Keihin non-CV Carb (Late 1976-1987)]
techtalk:ih:carb01 [2020/05/10 18:43] (current)
hippysmack [Mikuni (general application)]
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 [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]] [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]]
-====== IH: Carburetor, Intake Manifold & Exhaust ​Systems ​====== +====== IH: Carburetor, Intake Manifold & Exhaust ======
- +
  
 \\ \\
  
 ====== FACTORY CARBURETORS ====== ====== FACTORY CARBURETORS ======
 +===== Linkert Model M and DC Carbs (1957-1965) =====
 +==== Sub Documents ====
  
-===== Links to Carb Diagrams and Parts ===== +  ​* [[techtalk:ih:carb01a|Linkert ​Carb Identification]] 
-  +  * [[techtalk:ih:carb01b|Rebuilding the Linkert Carb]] 
-  ​* [[http://​www.linkertcarbs.com/​| Linkert ​Carbs.com]] +  * [[techtalk:​ih:​carb01c|Linkert Carb Functions, Adjustments,​ Tuning]].
-  * [[https://​www.demonscycle.com/​manuals_diagrams|Demons Cycle website of useful manuals]] +
-  * [[techtalk:​ih:​carb01#​parts_and_services_for_your_tillotson_carb|Tillotson exploded parts view and service manual]]+
  
  
-===== Linkert Model M and DC Carbs (1965 and Earlier) ===== 
   * Three different carburator families were used on the K and Sportsters through 1969. Three models of the venerable Linkert Model M carbs were used on K and KH. Sportsters used various incarnations of the Linkert DC and M carbs from 1957 through 1965. ((http://​www.harleykmodel.com/​technical/​carbs/​index.html))   * Three different carburator families were used on the K and Sportsters through 1969. Three models of the venerable Linkert Model M carbs were used on K and KH. Sportsters used various incarnations of the Linkert DC and M carbs from 1957 through 1965. ((http://​www.harleykmodel.com/​technical/​carbs/​index.html))
-  ​ 
- 
- 
- 
  
 ==== The Linkert Model M ==== ==== The Linkert Model M ====
Line 40: Line 33:
     * New carburetor support bracket (basically an "​L"​ bracket on the bottom of the float bowl.) ((1952-1959 HD Spare Parts Catalog pgs 15,​16)) ​     * New carburetor support bracket (basically an "​L"​ bracket on the bottom of the float bowl.) ((1952-1959 HD Spare Parts Catalog pgs 15,​16)) ​
   * Most K models ran a Linkert M model Carb up until around 1965.   * Most K models ran a Linkert M model Carb up until around 1965.
- 
- 
- 
  
 ==== The Linkert Model DC ==== ==== The Linkert Model DC ====
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     * Adjustable high and low speed nozzles, and a fixed jet.     * Adjustable high and low speed nozzles, and a fixed jet.
  
 +All except DC2 are the same body. NOS bodies actually were shipped blank and the dealer stamped the number needed on them. ((http://​linkertcarbs.com/​linkert.html)) \\
 +If you have a larger bore body using a 9X throttle disc, this is from the modification bulletin Harley put out on the DC carbs many years ago. \\
 +Differences on all except the DC2 were in jet sizes, needle & seats, bowl lettering, etc, all minor. \\
 +They did not make a DC3, DC5, DC8, DC9, or DC11. ("​real"​ DC11 "​race"​ carbs were modified versions of other DC models as per the race mod bulletin Harley put out) \\
 +Here is a link to that drawing at [[http://​linkertcarbs.com/​dc%20carb%20modification.html|Into The Wilderness Trading]].
 +(whether by Harley themselves for the XLR or by a particular dealer) \\
 +Linkert did not make DC11 carbs as such, and you will also find these mods on every model out there except DC2. \\
 +A few are well done and re-stamped as DC11 ( probably by Harley for racers). Some very poor quality backyard jobs with the idle ports ruined, so look them over carefully. \\
  
-^Carb Model^HD Bike Used On^Idle Bleed^Idle Tube Feed^Fixed Jet^Throttle Disc^Turns (high speed setting)^Turns (idle speed setting)+^Sportster \\ Carb Model^Idle Bleed^Idle Tube \\ Feed^Fixed Jet^Throttle ​\\ Disc^High \\ Speed \\ Setting^Idle Speed \\ Setting
-|(27155-57) was the first Sportster carburetor then replaced with (27155-57A) both introduced for 1957-1959 Sportsters ​((1952-1959 HD Spare Parts Catalog pg 16))|||||||| +|**27155-57** ((1952-1957 HD Spare Parts Catalog pg 15 for all Sportster and K models)) **1957-1958 Sportster**||||||| 
-|DC-1|1957-1958 Sportster XL Early Style ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#53 .0595|#69 .0293|#9 .067|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 3/4" to 1" ​ ((HD 1959-1964 Sportster FSM))| +|DC-1 ((HD TSB #389 dated 5-1-57)) \\ Standard \\ 1957 (only)|#53 .0595|#69 .0293|#9 .067|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 3/4" to 1" ​ ((HD 1959-1964 Sportster FSM))| 
-|DC-1L|1959-1960 Sportster ​XL ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) |#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))|  +|**27155-57A** ((1952-1959 HD Spare Parts Catalog pg 16 for all Sportster and K models)) **1959-1960 Sportster**|||||||  
-|DC-1M|1959-1960 Sportster XL ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#53 .0595|#69 .0293|#1 .052|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 1" ((HD 1959-1964 Sportster FSM))|  +|DC-1L ​((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) ​\\ Standard \\ 1958-1960|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))|  
-|DC-2|1959-65 Servicar ​(smaller venturi, opposite float bowl)((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#51 .067|#70 .028|#20 .0452|12 ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) ​3/4" to 1-1/​4" ​1" to 1-1/4" ((HD 1959-1964 Sportster FSM))|  +|DC-1M ((HD TSB #389 dated 5-1-57)) \\ Miltary XLA|#53 .0595|#69 .0293|#1 .052|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 3/4" to 1-1/4" | 1" ((HD 1959-1964 Sportster FSM))|  
-|DC-6|1961 Sportster XLH and XLCH ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#​53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | +|**27155-57B** ((1959-1961 HD Spare Parts Catalog Supplement for all Sportster and K models)) **1961-1965 Sportster**||||||| 
-|DC-7|1966 Big-Twin FL and FLH (larger venturi) ​((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#53 .0595|#69 .0293| ​   .070|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2))| +|DC-6 ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) ​\\ Standard \\ 1961|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2)) | 
-|DC-10|1962 and mid-63 Sportster XLH and XLCH ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2))| 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))|  +|DC-10 ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) ​\\ Standard \\ 1962-E1963|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&​highlight=Linkert&​page=2))| 3/4" to 1-1/4" | 1" to 1-1/4" ((HD 1959-1964 Sportster FSM))|  
-|DC-12|1966 Big-Twin FL and FLH \\ mid-1963 1964 1965 Sportster XLH and XLCH ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html))|#​53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​=691253&​highlight=Linkert&​page=2))|+|DC-12 ((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) ​\\ Standard \\ L1963-1965|#53 .0595|#69 .0293|#4 .0625|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​=691253&​highlight=Linkert&​page=2))|
  
- +^Other HD Carb Model^Idle Bleed^Idle Tube \\ Feed^Fixed Jet^Throttle \\ Disc^High \\ Speed \\ Setting^Idle Speed \\ Setting
- +|DC-2 ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html)) \\ 1959-65 Servicar \\ (smaller venturiopposite float bowl)|#51 .067|#​70 ​.028|#20 .0452|12 ​((thefrenchowl ​from the XLFORUM http://​xlforum.net/​forums/​showthread.php?t=691253&highlight=Linkert&page=2)) | 3/4" ​to 1-1/4" | 1" ​to 1-1/4" ​((HD 1959-1964 Sportster FSM)) 
----- +|DC-((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) \\ 1966 Big-Twin FL and FLH \\ (larger venturi)|#53 .0595|#69 .0293   .070|9A ((thefrenchowl from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=691253&highlight=Linkert&​page=2))| 
- +|DC-12 ((http://www.classic-motorcycle-build.com/linkert-dc-carb.html)) \\ 1966 Big-Twin FL and FLH|#53 .0595|#​69 ​.0293|#4 .0625|9A ((thefrenchowl ​from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​=691253&​highlight=Linkert&​page=2))|
- +
- +
- +
- +
- +
-   +
-   +
-    +
-   +
-==== Adjusting the Linkert DC ==== +
-  +
-^Carb Idle Speed^ +
-|Adjust until engine idles and runs smoothly| ​((Clymer Sportster Repair Manual 1959-1985)) +
- +
- +
-  * A properly adjusted carburetor requires little re-adjustment according to the FSM. It shouldn'​t be necessary to change the adjuster of the low speed needle more than 1/8 turn or the high speed adjuster more than 1/4 turn richer or leaner to obtain correct mixture for a change in altitude unless there are some worn or obstructed parts to consider.((1959-1969 HD Sportster FSM)) +
-  * Before attempting to correct faulty engine performance through carb adjustment, eliminate all other possible causes for poor engine performance such as bad spark plugs, poor timing, mal-adjusted tappets, dirty air cleaner, leaking gaskets and poor manifold connections.((1959-1969 HD Sportster FSM)) +
-  * The fuelair mixture for low engine speed is regulated by the low speed needle only. The fuel supply for high speed is regulated by a combination of the adjustable needle and the fixed jet (which dominates the regulation of high speed fuel supply). The high speed needle provides a supplement, to a degree, of the fuel supplied by the fixed jet when it is found that slightly enrichening the mixture improves engine performance. ((1959-1969 HD Sportster FSM))     +
-  +
-<​blockquote>​  +
-  * Both, high speed and low speed, needles turn inward (clockwise) for leaner or outward (counterclockwise) for richer mixtures at the respective speeds for which they adjust. +
-    * Adjust idle (low speed): Make sure the carb control wire is adjusted so the throttle lever fully closes and opens with handlebar movement.((1959-1969 HD Sportster FSM)) +
-    * Turn both the high and low needles all the way in (clockwise) to a light seat position but do not close off either too tight as it may damage needle and/ or seat. ((1959-1969 HD Sportster FSM)) +
-    * Turn low speed needle out app. 1 1/2 turns (in this positionengine will start but low speed idle will probably be too rich).((1959-1969 HD Sportster FSM)) +
-    * Start the engine, let it reach operating temp, choke off (open) then correct the position of the low speed needleTurn the low speed needle in (clockwise) 1/8 turn at a time until engine leans out and misses and is inclined to stop. Then, back low speed needle out 1/8 turn at a time (allow a few seconds in between turns to allow engine to adjust) until engine hits regularly with spark advanced, throttle closed and engine running at idle speed. Starting and all around performance will be better with low speed adjustment slightly rich, rather than lean. ((1959-1969 HD Sportster FSM)) +
-    * Adjust throttle lever stop screw as needed to make engine idle at proper speed with throttle fully closed. Turn screw clockwise for faster or counterclockwise for slower idle speed. Be careful not to idle engine at the slowest possible speed because an extreme low idle position will cause hard starting. Changing the idle speed with the throttle screw may also alter the low speed fuel/ air mixture so remember to go back and check that adjustment and correct if needed using the above method.((1959-1969 HD Sportster FSM)) +
-    * Turn high speed needle out app. 3/4 turns. Check high speed adjustment by running the  motorcycle on the road at various speeds between ​20 mph and max speed with spark fully advancedRe-adjust high speed needle until optimum performance is achieved. Best all around engine performance can usually be found with the high speed needle set between 3/4 and 1 1/2 turns out (open). ​((1959-1969 HD Sportster FSM)) +
-   </​blockquote>​  +
-  * The FSM may be of little use from this point on. +
-    * Its trial and error now to find out what works for you. Idle speed is critical in easy starting. Low idle can make bikes difficult to start and too high is uncomfortable at stops. There is a sweet spot in there somewhere that you must find. 1200 rpm is a good speed to begin your fine tuning. ((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?p=5287605&​postcount=31)) +
-    * When it's warm and it's been off for a minute. I only need to push the kicker through and it starts up. If it's been off for a bit, the first kick without retarding the mag results in a locked up kicker, feeling there is a fuel charge sitting in the combustion chamber. The idle adjustment screw can be backed out as far as I want and it doesn'change much at all. If I go too lean, it will stumble of course. If the idle adj. screw is 1/8th out from stumble as the manual suggests, I have a hard time with starting. ((Zaemo of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&postcount=31)) +
-  * The bigger picture regarding these adjustments for this the throttle plate must be: Positioned (milled notch up facing air cleaner) and registered (even peripheral contact to throttle body at fully closed) correctly.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&​postcount=31)) +
-    * Removing the brass screw plug near idle mix screw exposes the idle well. On the side wall of the well you will see a hole that feeds mixture (note that I didn't say fuel) to the idle mix screw. Mixture that enters this hole is regulated by the adjuster screw, and discharged into air stream thru a hole drilled close to intake manifold. This supplies most of the idle mixture.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&​postcount=31)) +
-    * Then on floor of the well you will see a series of tiny holes. These are the transition holes. The remainder of idle mixture comes from the 1st (one closest ​to manifold) transition hole as its open to low manifold pressure. The other 3 are open to the higher atmospheric pressure because they are on the other side of throttle plate at idle. That means lots of air enters the well thru the 3 hi pressure holes. All that air dilutes the fuel into a '​mixture'​. Because the idle mix screw adjusts the flow of this mixture a funny thing happens as you richen it. Because the air component is so much less dense than the fuel component the mix screw is less a restriction to the air than to the fuelits gets to a point where opening it adds more air then it does fuel. In other words it will only get so rich no matter how far you back it out. This is a DC Linkert anomaly because ​holes spread over a very large throttle plate swing bleed a lot of air into the well on idle. Things change as soon as you begin opening throttle plate. Now the number of transition holes open to low pressure is larger and the number open to atmospheric pressure is less. ie: the air component of the mixture drops. Now the idle mix screw is controlling a more fuel laden mixture. The ratio of air to fuel continuously drops as you open the throttle until the last holes is on downstream of the plate. The mix screw will have a larger effect on low throttle running than idling. You need to set screw where you get good around town manners and then adjust the speed screw to the appropriate speed.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&​postcount=31)) +
-  * This is a delicate balancing act that will change as the properties of the air change: temperature,​ pressure ​(altitude or barometer), and water content ​(humidity). The dc is prone to this fickleness due to the large air bleed variation at different throttle plate positions.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&​postcount=31)) +
-  * The S&S carbs based on the DC Linkert used only two transition holes in the early years and three later on. Both show a marked improvement in weather stability.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showpost.php?​p=5287605&​postcount=31)) +
- +
-  +
-  * These carbs are extremely touchy to float level at just off idle throttle positions. Problems show as spitting / coughing on one end of the spectrum to burbiling / stumbling at the other end. Many owners will report how precise you need to be with float levels to get your bike to run as a fine watch.These guys also eventually learn two things:((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1993187&​highlight=linkert)) +
-    ​Float levels will rise on their own due to the steel inlet needle wearing the brass seat away. This is a mileage thing-- just like tire and chain wear (steel needle carbs only- linkert, orig earlies and orignal L's). ((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1993187&​highlight=linkert)) +
-    - Secondly and more importantly,​ these carbs are very susceptible to errant low speed metering as fuel composition,​ barometric pressure, humidity, and air temperature vary. Trying to hit the sweet spot requires many float adjustments,​ idle mixture settings, idle speed settings and road tests. To do away with that wasted time and aggravation,​ I fit all my side bowl carbs with an externally adjustable float level. Now I can change float level on a whim.((DR DICK of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1993187&​highlight=linkert))  +
-     +
-  +
- +
- +
- +
-==== Linkert ​DC Rebuilding ==== +
-  * A gasket kit (which includes the bowl and body gaskets, seals, and an o-ring for the bowl vent tube instead of a gasket) and some carburetor cleaner is all you need to rebuild a Linkert DC carb. No special tools are required. ​  All DC carbs use the same gaskets and seals. If needed, a larger gasket set is available, and includes the gaskets and seals, plus an assortment of small springs and screws.  ​((http://​www.classic-motorcycle-build.com/​linkert-dc-carb.html)) +
- +
-|Carb Assembly is HD Part Number: 27155-57B((1959-1969 HD Sportster FSM))|||| +
-^Model ​\\ (marked on carb)|Idle Port Hole \\ Drill Sizes^Model ​\\ (marked on carb)|High Speed Hole \\ Drill Sizes| +
-|DC-1, 1L, 1M, 10 \\ DC-2|#70 (0.028 in) \\ #56 (0.0465 in)|DC-1, 1L, 1M, 10, 6, 7, 12 \\ DC-2|#55 (0.052 in) \\ #70 (0.028 in)| +
- +
- +
-==== Linkert DC Pics ==== +
-|{{techtalk:​ih:​carb:​linkert_dc-11_by_xlh59.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​linkert_dc-11_by_xlh59_2.jpg?​direct&​300|}}| +
-| Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1914726&page=2)) | Linkert ​DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1914726&​page=2)) | +
-|{{techtalk:​ih:​carb:​linkert_dc-11_by_xlh59_3.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​linkert_dc-11_by_xlh59_4.jpg?​direct&​300|}}| +
-| Linkert ​DC-11 ((Photos courtesy of xlh59 of the XLFORUM ​http://xlforum.net/​forums/​showthread.php?​t=1914726&​page=2)) | Linkert DC-11 ((Photos courtesy of xlh59 of the XLFORUM http://​xlforum.net/forums/​showthread.php?​t=1914726&​page=2)) |((Photos courtesy of The Doctor71 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1914726&​page=2)) +
-==== Linkert DC Mods ==== +
-   +
- +
-|{{techtalk:​ih:​carb:​linkert_dc_linkage_mod_by_the_french_owl.jpg?​direct&​300|}} \\ Linkage modified for usage with "​snap"​ throttle ​((photo courtesy of thefrenchowl ​of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1993187&​highlight=linkert))| +
- +
-  +
- +
-----+
  
 ===== Tillotson HD Carb (1966-1971) =====  ===== Tillotson HD Carb (1966-1971) ===== 
 +==== Sub Documents ====
  
 +  * [[techtalk:​ih:​carb01e|Tillotson Carb Identification]] 
 +  * [[techtalk:​ih:​carb01f|Rebuilding the Tillotson Carb]] 
 +  * [[techtalk:​ih:​carb01g|Tillotson Carb Functions, Adjustments,​ Tuning]]. \\
  
  
Line 179: Line 113:
 |27804-66|Diaphragm Cover without the ball check valve| |27804-66|Diaphragm Cover without the ball check valve|
 |27804-66A|Diaphragm Cover the ball check valve| |27804-66A|Diaphragm Cover the ball check valve|
- 
- 
  
 **Tillotson Carbs** (1968-1971) ((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968)) ((1970-2010 Haynes Sportster Service and Repair Manual pg 3.1)) **Tillotson Carbs** (1968-1971) ((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968)) ((1970-2010 Haynes Sportster Service and Repair Manual pg 3.1))
- 
  
 ^Serial Number^Main Jet^ ^Serial Number^Main Jet^
 +|27160-66B ((rivethog of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=757993&​page=2)) \\ Big Twin|  |
 |27162-66B((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968))| ​   | |27162-66B((Shop Dope Vol 4 Service Bulletin No 571 May 21, 1968))| ​   |
 |27162-66C((HD Sportster Parts Catalog pg B11-1 (99451-78B) ))|0.053",​ 0.055",​ 0.059",​ 0.057",​ 0.061",​ 0.063"​((HD Sportster Parts Catalog pg B11-1 (99451-78B) ))| |27162-66C((HD Sportster Parts Catalog pg B11-1 (99451-78B) ))|0.053",​ 0.055",​ 0.059",​ 0.057",​ 0.061",​ 0.063"​((HD Sportster Parts Catalog pg B11-1 (99451-78B) ))|
Line 195: Line 127:
 |Carb Idle Speed| 900- 1,100 RPM ((Clymer Sportster Repair Manual 1959-1985))|| ​ |Carb Idle Speed| 900- 1,100 RPM ((Clymer Sportster Repair Manual 1959-1985))|| ​
   ​   ​
- 
----- 
- 
-===== Tillotson Carburetor Pics ===== 
- 
-|{{techtalk:​ih:​carb:​tillotson_carb_1_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​tillotson_carb_4_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​tillotson_carb_2_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| 
-|Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson Carburetor on a 1971 XLCH ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| 
- 
-|{{techtalk:​ih:​carb:​tillotson_carb_6_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​tillotson_inside_view_of_tickler_before_installation_7_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​tillotson_carb_3_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| ​ 
-|Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson- Inside view of tickler before installation ((Pic courtesy of The Doctor71 of the XLFORUM))| Tillotson- Diaphragm ((Pic courtesy of The Doctor71 of the XLFORUM))| ​ 
- 
- 
-|{{techtalk:​ih:​carb:​tillotson_carb_5_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| {{techtalk:​ih:​carb:​tillotson_air_cleaner_backing_cover_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{:​techtalk:​ih:​carb:​66_tillotson_1_by_dr_dick.jpg?​direct&​300|}}| 
-|Tillotson Carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Tillotson Air Cleaner Backing Plate ((Pic courtesy of The Doctor71 of the XLFORUM))|Notes on the 66 throttle shaft:​((photo by Dr Dick of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1567534&​page=4))| 
- 
-|{{:​techtalk:​ih:​carb:​66_tillotson_2_by_dr_dick.jpg?​direct&​300|}}| 
-|The 66 only choke shaft.:​((photo by Dr Dick of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1567534&​page=4))|  ​ 
- 
-===== Parts and Services for your Tillotson Carb ===== 
- 
-  * Parts list for Tillotson HD carbs: 
-      * http://​tillotson.ie/​wp-content/​uploads/​2015/​07/​HD-Series-1-Parts-List.pdf 
-      * http://​tillotson.ie/​wp-content/​uploads/​2015/​07/​HD-Series-2-Parts-List.pdf 
-  * Service manual for Tillotson carbs: 
-      * http://​tillotson.ie/​wp-content/​uploads/​2016/​03/​Tillotson-HD-Series-Carburetor.pdf 
-  * Servicing for Tillotson carbs: 
-      * Tillotson Company http://​tillotson.ie/​market/​vintage/?​filters=product_cat[repair-kits-parts] 
-      * EC Carburetors:​ Specializes in HR, HL and HD carburetors for racing, vintage snowmobiles and Harley-Davidson Motorcycles. http://​eccarburetors.com/​estore/​ 
- 
- 
-|{{techtalk:​ih:​carb:​tillotson_carb_repair_kit_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| 
-|Tillotson Carburetor repair/ refresh kit((Pic courtesy of The Doctor71 of the XLFORUM))| 
- 
- 
----- 
- 
 ===== Mikuni (XR-750 racing engines only) ===== ===== Mikuni (XR-750 racing engines only) =====
  
Line 246: Line 142:
 |38mm Carb Types|Main|Pilot|Needle Jet|Slide| |38mm Carb Types|Main|Pilot|Needle Jet|Slide|
 |TM38-85 (47mm spigot dia.) \\ TM38-86 (43mm spigot dia.)|210-260|20-25|6FM46|Q0,​Q2,​Q4|4.0| |TM38-85 (47mm spigot dia.) \\ TM38-86 (43mm spigot dia.)|210-260|20-25|6FM46|Q0,​Q2,​Q4|4.0|
- 
  
   * Most Mikuni carbs have a backwards Idle mix screw, in to richen, out to lean. ((ryder rick from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​postid=5514564#​post5514564))   * Most Mikuni carbs have a backwards Idle mix screw, in to richen, out to lean. ((ryder rick from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​postid=5514564#​post5514564))
   * The longer carb provides a better signal to the fuel metering business inside. This is why the round slide carb works so well combined with the taper on the slide and needle. The round slide carb will have a wider sweet spot than a flat slide ((ryder rick http://​xlforum.net/​forums/​showthread.php?​threadid=2006195)) and that equates to better low range. ((big_sleezy http://​xlforum.net/​forums/​showthread.php?​t=2006195&​page=2))   * The longer carb provides a better signal to the fuel metering business inside. This is why the round slide carb works so well combined with the taper on the slide and needle. The round slide carb will have a wider sweet spot than a flat slide ((ryder rick http://​xlforum.net/​forums/​showthread.php?​threadid=2006195)) and that equates to better low range. ((big_sleezy http://​xlforum.net/​forums/​showthread.php?​t=2006195&​page=2))
- 
  
 ===== Mikuni (general application) ===== ===== Mikuni (general application) =====
 +Click here for more information on [[techtalk:​ref:​carb01#​mikuni_aftermarket_carbs_and_upgrades|Mikuni Carbs]] in the REF section of the Sportsterpedia. \\ 
  
-|38mm Carb Types|Main|Pilot|Needle Jet|Throttle Valve|Jet Needle|Air Jet| +The VM series carbs are round slide Mikunis, 34, 36, 38 MM etc. Only Mikuni round slide carbs are designated as VM. 
-|VM38-9 (43mm spigot)((IronMick ​http://​xlforum.net/​forums/​showthread.php?​t=2006195&page=2))|330|30|Q-2|2.5|6DP1|0.5|+Mikuni lists the following Vintage Carb Kits: ((piniongear of the XLFORUM ​http://​xlforum.net/​forums/​showthread.php?​t=765846&page=8)) \\ 
 +001-200....HDS-101/​38mm.... Sportster/​Shovelhead \\ 
 +001-204....HDS-101A/​40mm.... Sportster/​Shovelhead \\ 
 +001-202....HDS-101B/​44mm.... Sportster/​Shovelhead \\ 
 +So any of these 3 sizes will work.
  
-----+|**Mikuni** (**XR-750 Racing Engines Only**)|| 
 +|VM-36-1 \\ VM-36-4 \\ VM36/​39|1972-1980 XR-750 / 36 mm with a round slide ((http://​xlforum.net/​forums/​showthread.php?​t=2006195&​page=3))((1972-2003 HD XR-750 Service Manual pg 39))| 
 +|TM38-85 (47mm spigot dia.) \\ TM38-86 (43mm spigot dia.) \\ TM38-85 (47mm spigot dia.) \\ TM38-86 (43mm spigot dia.)|1989-2003 XR-750 / 38 mm with a flat slide((1972-2003 HD XR-750 Service Manual pg 39))| 
 + 
 +The correct version of the VM38 for an ironhead Sportster is the VM38-9. ((IronMick of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1814834&​page=2)) ((piniongear of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=765846&​page=3)) ((piniongear of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=765846&​page=4)) \\ 
 +The VM38-"​9"​ was setup and extensively tested by Jerry Branch for the stock Sportster engine using flow bench tech for the time. ((simeli of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1636803&​page=2)) \\ 
 + 
 +|38mm Carb Types|Main|Pilot|Needle Jet|Throttle Valve|Jet Needle|Air Jet| 
 +|VM38-9 (43mm spigot)((IronMick http://​xlforum.net/​forums/​showthread.php?​t=2006195&​page=2))|330|30|Q-2|2.5|6DP1|0.5 \\ 2.0|
    
 ===== Bendix/ Zenith I6P12 Carb (1972-Early 1976) ===== ===== Bendix/ Zenith I6P12 Carb (1972-Early 1976) =====
-  ​* Model 16P12 (standard) is a horizontal plain tube type carb with a fuel bowl, single ring shaped float, an accelerator pump, idle mixture adjusting needle and a throttle stop screw for idle speed adjustment.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) + 
 +==== Sub Documents ==== 
 + 
 +  * [[techtalk:​ih:​carb01k|Bendix Carb Identification]] 
 +  * [[techtalk:​ih:​carb01l|Rebuilding the Bendix Carb]] 
 +  * [[techtalk:​ih:​carb01m|Bendix Carb Functions, Adjustments,​ Tuning]]. \\ 
 + 
 +---- 
 + 
 +  ​* Model 16P12 sidedraft carb (standard ​for Harley'​s) is a horizontal plain tube type carb with a fuel bowl, single ring shaped float, an accelerator pump, idle mixture adjusting needle and a throttle stop screw for idle speed adjustment.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
   * The throttle body casting contains an integral venture and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a long boss that the main jet and discharge tube assembly screw into with the end of the tube projecting up into the venture.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))    * The throttle body casting contains an integral venture and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a long boss that the main jet and discharge tube assembly screw into with the end of the tube projecting up into the venture.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
   * Note for 1973 and earlier: The change letter (A or B) is stamped near the Basic Bendix carburetor part number (13609) for identifying carburetors with modifications. Idle tube 27749-72 (marked A) is standard on carbs marked with a change letter (A). Idle tube 27750-72 (marked B) is standard on carbs marked with change letter (B).((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))    * Note for 1973 and earlier: The change letter (A or B) is stamped near the Basic Bendix carburetor part number (13609) for identifying carburetors with modifications. Idle tube 27749-72 (marked A) is standard on carbs marked with a change letter (A). Idle tube 27750-72 (marked B) is standard on carbs marked with change letter (B).((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
Line 268: Line 184:
     * **Choke System**: Before cranking the engine, the throttle should be opened to expose all three idle holes. The choke plate should be held fully closed during the cranking. After the engine starts, open the choke slightly. A hole in the choke plate helps prevent over-choking when the engine is started. The choke should be moved to wide open when the engine is partially warmed up.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))      * **Choke System**: Before cranking the engine, the throttle should be opened to expose all three idle holes. The choke plate should be held fully closed during the cranking. After the engine starts, open the choke slightly. A hole in the choke plate helps prevent over-choking when the engine is started. The choke should be moved to wide open when the engine is partially warmed up.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
     * **High Speed metering System**: The fuel for the engine operation from off-idle to full throttle is supplied from the fuel bowl through the main metering jet, metering well and discharge tube. As the fuel flows thru the metering well and tube, it mixes with air entering the well vent to provide the correct fuel/ air mixture ratio for all engine speeds and loads. A series of air bleed holes in the discharge tube permits air from the well vent to enter the bowl below the level of the fuel in the float chamber. This reduces the average density of the fuel and enables it to flow freely at low suction. At high engine speeds, (and high suction), the air to fuel proportion thru the main metering system is reduced to provide a richer mixture needed for peak performance. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))        * **High Speed metering System**: The fuel for the engine operation from off-idle to full throttle is supplied from the fuel bowl through the main metering jet, metering well and discharge tube. As the fuel flows thru the metering well and tube, it mixes with air entering the well vent to provide the correct fuel/ air mixture ratio for all engine speeds and loads. A series of air bleed holes in the discharge tube permits air from the well vent to enter the bowl below the level of the fuel in the float chamber. This reduces the average density of the fuel and enables it to flow freely at low suction. At high engine speeds, (and high suction), the air to fuel proportion thru the main metering system is reduced to provide a richer mixture needed for peak performance. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))   
-  + 
-  * Features: ​ ((1959-1985 Clymer Sportster Service and Repair Manual pg 78))+**Application Dimensions**:​ ((http://​www.zenithfuelsystems.com/​sidedraft_16p12.htm)) \\  
 +  * Engine Size 60-75 CID 
 +  ​* Throttle Bore 1.153"​ 
 +  * Choke Bore 2.0" 
 +  * Venturi Diameter: 38-40 mm range 
 +  * Fuel Inlet Fitting: 1/​8"​-27 pipe thread  
 + 
 +**Features**:  ((1959-1985 Clymer Sportster Service and Repair Manual pg 78)) ((http://​www.zenithfuelsystems.com/​sidedraft_16p12.htm))
     * 38mm((HD XLH,​XLCH-1000 Parts Catalog (99451-78B) ))     * 38mm((HD XLH,​XLCH-1000 Parts Catalog (99451-78B) ))
-    * Integral ​Float Chamber+    * Integral ​float chamber
     * Low speed needle     * Low speed needle
 +    * Stock Bendix carbs for Sportsters have fixed main jets and course threads. \\ Aftermarket Bendix carbs are offered with adjustable mains and fine threads. \\ 
     * Throttle stop screw     * Throttle stop screw
     * Throttle lever     * Throttle lever
-    * Manual ​Choke lever +    * Manual ​choke lever: allows operator to control engine warm-up ​ 
-    * Barrel ​Type Accelerator ​pump+    * Barrel ​type accelerator ​pump 
 +    * Internal bowl venting: minimizes the effects of air cleaner deterioration
     * Bowl drain plug     * Bowl drain plug
     * ID number stamped on top over the butterfly plate     * ID number stamped on top over the butterfly plate
-    * Intake ​Manifold ​( 27021-71A )(( HD Sportster Parts Catalog (99451-78B) )) +    ​* All aluminum die cast construction  
-  +    ​* Intake ​manifold ​( 27021-71A )(( HD Sportster Parts Catalog (99451-78B) )) 
 ^Year Model XLH/ XLCH^Serial Number^Main Jet Sizes (mm)^Low Speed Idle Jet^^ ^Year Model XLH/ XLCH^Serial Number^Main Jet Sizes (mm)^Low Speed Idle Jet^^
-|1972-Early 1975|27155-72 ((http://​xlforum.net/​forums/​showthread.php?​t=1981918))|0.90mm|Part #(27749-72) (( HD Sportster Parts Catalog ​pg 27 (99451-78B) ))|+|**E1972**|27155-72 ((1972,1973 HD Sportster Parts Catalog Supplements (99451-72), (99451-73) ​)) |0.90mm ​(27612-71)|**Early '​72** ​(27749-72) ​\\ **Late '​72-'​74** ​(27750-72)|| 
-|1972-Early 1975|27155-72A ((http://​xlforum.net/​forums/​showthread.php?​t=1981918))|'72-early '75 (0.95), '72-74 (1.00,1.05, 1.10, 1.15, 1.20, 1.25mm)|Late '​72-'​74 Part #(27750-72)(( HD Sportster Parts Catalog pg 28 (99451-78B) ))||  +|**L1972-1974**|27155-72A ​((1973, 1974 HD Sportster Parts Catalog ​Supplements ​(99451-73) (99451-74) ))|**Late '72-'73** \\ 0.95mm (27614-71) \\ 1.00mm (27618-71) \\ 1.05mm (27619-71 standard) \\ **Added in L'​74-E'​76** \\ 1.10mm (27620-71 standard) ​((The Doctor71 of the XLFORUM ​http://​xlforum.net/​forums/​showthread.php?​t=2073320)) \\ 1.15mm (27621-71\\ 1.20mm (27622-71) \\ 1.25mm (27623-71)|:::|:::|  
-|1975-Early 1976 \\ (also used on '​71-'​75 FX models)((1971-1984 HD FX Parts Catalog pg 35))| 27155-72B(( HD Sportster Parts Catalog (99451-78B) ))|0.95, 1.00,1.05, 1.10, 1.15, 1.20 mm (( HD Sportster Parts Catalog ​pg 27 (99451-78B) ))|||+|**1975-Early 1976** \\ Including all '​71-'​75 FX models| 27155-72B ((1975 HD Sportster Parts Catalog ​Supplement ​(99451-75) )) ((1976 HD Sportster Parts Catalog ​Supplement ​(99451-76)) ((1971-1984 HD FX Parts Catalog pg 35)) |:::|:::|:::|
 ^  Bendix Main Jet Identification ((Shop Dope Service Bulletin #697 dated March 29, 1976)) ​ ^^^^^ ^  Bendix Main Jet Identification ((Shop Dope Service Bulletin #697 dated March 29, 1976)) ​ ^^^^^
 ^Model Info^HD Main Jet Part #^Bendix Main Jet Part #^Bendix Main Jet Size^Drill Size^ ^Model Info^HD Main Jet Part #^Bendix Main Jet Part #^Bendix Main Jet Size^Drill Size^
Line 292: Line 218:
 |Carb Idle Speed | 700- 900 RPM ((Clymer Sportster Repair Manual 1959-1985))|||| ​ |Carb Idle Speed | 700- 900 RPM ((Clymer Sportster Repair Manual 1959-1985))|||| ​
  
 +===== Keihin "​butterfly"​ or "​non-CV"​ Carb (Late 1976-1987) =====
  
----- +==== Sub Documents ​====
- +
-===== Bendix / Zenith Carburetor Pics ===== +
- +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_15_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_14_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_13_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_8_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_2_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_3_throotle_plate_screws_removed_by_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_4_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_10_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_11_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_12_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor ((Pic courtesy of The Doctor71 of the XLFORUM))| +
-|{{techtalk:​ih:​carb:​bendix-zenith_carb_7_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}|{{techtalk:​ih:​carb:​bendix-zenith_carb_6_the_doctor71_of_the_xlforum.jpg?​direct&​300|}}| +
-|Bendix / Zenith carburetor on a 1974 XLH ((Pic courtesy of The Doctor71 of the XLFORUM))|Bendix / Zenith carburetor on a 1974 XLH ((Pic courtesy of The Doctor71 of the XLFORUM))|+
  
 +  * [[techtalk:​ih:​carb01p|Keihin Butterfly Carb Identificaton]]
 +  * [[techtalk:​ih:​carb01q|Rebuilding a Keihin Butterfly Carb]]
 +  * [[techtalk:​ih:​carb01r|Keihin Butterfly Carb Function and Tuning]]
 +  * [[techtalk:​ih:​carb01t|Origin of the Keihin BH Carburetor]]
  
 ---- ----
- 
-===== Keihin non-CV Carb (Late 1976-1987) ===== 
-* . . . [[techtalk:​ih:​carb01a|Origin of the Keihin BH Carburetor]] 
- 
  
   * The Keihin non-CV carburetor is a horizontal type with a fuel bowl, single ring-shaped float, an accelerating pump, idle mixture adjusting needle and a throttle stop screw for speed adjustment. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))    * The Keihin non-CV carburetor is a horizontal type with a fuel bowl, single ring-shaped float, an accelerating pump, idle mixture adjusting needle and a throttle stop screw for speed adjustment. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
Line 324: Line 236:
     * **The Accelerating Pump System**: The accelerating pump system works with sudden throttle openings (rapid acceleration) to quickly inject fuel into the carb to provide extra fuel for the engine demand. Rapid throttle action pushes the pump rod down, flexing the diaphragm, which compresses fuel underneath the diaphragm, forcing it up past the check valve and out the pump nozzle into the venturi. The check valve prevents backflow while the pump nozzle meters the flow. Spring action then returns the diaphragm back to it's original position. As the diaphragm returns, a new supply of fuel flows in and under it so the system will be ready to repeat the cycle with the next rapid throttle action detected. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))      * **The Accelerating Pump System**: The accelerating pump system works with sudden throttle openings (rapid acceleration) to quickly inject fuel into the carb to provide extra fuel for the engine demand. Rapid throttle action pushes the pump rod down, flexing the diaphragm, which compresses fuel underneath the diaphragm, forcing it up past the check valve and out the pump nozzle into the venturi. The check valve prevents backflow while the pump nozzle meters the flow. Spring action then returns the diaphragm back to it's original position. As the diaphragm returns, a new supply of fuel flows in and under it so the system will be ready to repeat the cycle with the next rapid throttle action detected. ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
     * **The Choke System**: The choke is manually set by pulling out on the choke button. Pulled all the way out is fully closed (for cold engine), partially open (for warm engine) or pushed all the way in, fully open (for warm engine). ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))     * **The Choke System**: The choke is manually set by pulling out on the choke button. Pulled all the way out is fully closed (for cold engine), partially open (for warm engine) or pushed all the way in, fully open (for warm engine). ((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))
-  * **Additional Tips** on usage: +
-    * Make sure the low speed and main jets are larger than stock to match the more free-flowing aftermarket exhausts and air filters we all seem to run. ((Hopper of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​threadid=659533)) +
-    * Do not run a worn out ignition auto advance unit. It makes carb farts that you would swear were lean low speed mixture.((Hopper of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​threadid=659533)) ​+
   * Integral Float Chamber   * Integral Float Chamber
   * Manual Choke   * Manual Choke
   * 3 different models ​   * 3 different models ​
   * Model Year Changes   * Model Year Changes
-  * **Tuning** 
-  * The usual method to set idle mixture/​speed is: 
-    * First: Set idle MIXTURE screw to 7/8 turns out. Get the bike hot. Set idle at comfortable speed with the idle SPEED screw. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-    * Second: Adjust the idle MIXTURE screw to the point where engine runs the fastest. This is optimum mixture. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-    * Third: Adjust idle SPEED screw again to get desired idle speed. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-  * The spring on the idle speed screw tends to creep the idle speed back up if you try to adjust the idle just that little bit slower. So I adjust the idle speed screw right down too slow, then nudge it up slightly faster until I get the speed I want, then it stays there. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-  * If your bike idles best with the idle mixture screw less than ½ turn open, you need a smaller low speed fixed jet. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-  * If your bike idles best with the idle mixture screw more than 1-1/4 turns open, you need a larger low speed fixed jet. 
-  * This is real important. It also is the way to stop “carb farts” – spitting back or backfiring through the carb. 
-    * If your Ironhead has aftermarket free-flow exhaust and airfilter on it, it will almost certainly need a larger low speed fixed jet, and most likely a bigger main jet too. But it is the low speed jet that affects the dreaded carb farts. Main jet affects mixture at wide open throttle and if left lean can overheat the engine, or burn holes in pistons. ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) 
-==== Late 1976-Early 1978 ==== 
  
-      * Features: +==== Sportster ​Keihin Butterfly Carburetors by Year Model ====
-        * 38mm venture ((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) +
-        * Pump adjusting screw +
-        * Idle mixture Screw +
-        * Throttle stop screw +
-        * Rocker arm +
-        * Intake manifold ( 27021-71A )(( HD Sportster ​Parts Catalog (99451-78B) )) +
-        * Accelerator pump rod attached at throttle cam ((HD XLH XLCH-1000 Parts Catalog (99451-78B) )) +
-        * New diaphragm accelerator pump ((HD XLH XLCH-1000 Parts Catalog (99451-78B) )) +
-        * Optional main jets were made available ((HD Parts and Accessories Bulletin dated February 8, 1977))  +
-       +
  
-==== Late 1978-1980 ​====+^Sportster Model^Year \\ Carb Used^HD Part Number^Flange / \\ Casting \\ Number^ ​ Main Jet \\ Size  ^Low Speed \\ Jet Size^Initial Mixture \\ screw setting^Accel Pump \\ spring position^ 
 +|XLH, XLCH|Late 1976|27153-76((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|B50A ((HD Service Bulletin #M-713 dated June 10, 1977))|(140 std) ((HD Service Bulletin #M713 dated June 10, 1977)) \\ Optional jets ((HD Parts and Accessories Bulletin dated February 8, 1977)) ​ \\ - 130, 135, 145, 150 \\ 155, 160, 165, 170, 175((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|100|7/​8 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| 
 +|XLH, XLCH, XLT|1977-1978 |27153-77 ((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|B50B ((HD Service Bulletin #M-713 dated June 10, 1977)) \\ B50C |(160 std) ((1954-1977 HD Sportster Parts Supplement pg 2)) (165 std) ((HD Service Bulletin #M713 dated June 10, 1977)) \\ Optional jets ((HD Parts and Accessories Bulletin dated February 8, 1977)) ​ \\ - 130, 135, 145, 150 \\ 155, 160, 165, 170, 175((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|75|1-1/​4 ((HD Service Bulletin #M713 dated June 10, 1977))|Center ((HD Service Bulletin #M713 dated June 10, 1977))| 
 +|XL, XLCH, XLS |1979|27469-78 ((1979 Harley Davidson Sportster Parts Catalog)) \\ 27469-78A ((1980 HD Sportster Parts Catalog -80 pg 17))|B83A \\ B83B|165 \\ 160 - above 4000' ((HD Service Buletin #M-730 dated June 15, 1978 - Instruction Sheet pg 2))|65 ((1979 Harley Davidson Sportster Parts Catalog))|  
 +|XL, XLS|1980|27469-80 \\ 27469-80A ((1981 HD Sportster Parts Catalog -81 pg 19))|B83C \\ B83D|160 \\ 165|65 ((1979-1985 HD XL Parts Catalog pg 23))| 
 +|XL, XLS|E81-E82 \\ L81-E82|27469-81 ((1981 HD Sportster Parts Catalog -81 pg 21)) \\ 27469-81A ((1983 HD Sportster Parts Catalog -83 pg 23))|B83E \\ B83F|160 \\ 160|68 ((1979-1985 HD XL Parts Catalog pg 25))| 
 +|XL, XLS|Late 1982|27469-82|B83G|150|68 ((1979-1985 HD XL Parts Catalog pg 25))| 
 +|XL, XLS, XLX|E1983|27469-83|B83H|160|52 ((1979-1983 HD XL Parts Catalog pg 23))|  
 +|XL, XLS, XLX|L1983|27469-83A|B83H|160|52 ((1979-1984 HD XL Parts Catalog pg 27))|  
 +|XL, XLS, XLX|1984|27469-83B|B83K|160|52 ((1979-1984 HD XL Parts Catalog pg 27))| 
 +|XL, XLS, XLX|1985|27469-83C|B83K|160|52 ((1979-1985 HD XL Parts Catalog pg 27))|  
 +|XLCR 1000 ((HD Service Bulletin #M713 dated June 10, 1977))|1977-1978|27148-77|B60A \\ B60B|185|90|1-1/​8 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| 
 +|XLCR 1000 \\ quiet engine ((HD Service Bulletin #M713 dated June 10, 1977))|1977-|27146-77|B75A|175|90|1-1/​2 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| 
 +|XL 883|1986-1987|27501-86A ((1986-1987 HD Sportster Parts Catalog pg 21))|B83H|155|52| 
 +|XL 1100|1986|27502-86A ((1986-1987 HD Sportster Parts Catalog pg 21))|B83H|155|52| 
 +|XL 1100|1987|27502-86B ((1986-1987 HD Sportster Parts Catalog pg 21))|B83H|150|52|
  
-      * Features/ Upgrades: +^  Main Jets ((1954-1976 HD Sportster Parts Catalog pg 19)) ((TSB #694 dated November 7, 1975))  ^^^^^^^ 
-        * Changed to 34 mm venture ​((Hopper http://​xlforum.net/​forums/​showthread.php?​t=276157&​page=2)) +|HD#|27397-76|27398-76|27399-76|27615-76|27400-76|27401-76| 
-        * Fast idle cam screw +|Size|155 \\ 1001-104-155|150 \\ 1001-104-150|145 \\ 1001-104-145|140 \\ 1001-104-140|135 \\ 1001-104-135|130 \\ 1001-104-130| 
-        * Limiter Cap (over idle mixture )-late 1978-1979 +^ ^^^^^^^ 
-        * Idle mixture screw is set and sealed off (1980) at the factory due to EPA regulations  +|HD#​|27356-76|27416-76|27417-76|27418-76|27419-76|27420-76| 
-        * Throttle stop screw, throttle lever +|Size|185|180|175|170|165|160|
-        * Choke plate +
-        * Choke lever shaft +
-        * Mounting flange +
-        * Accelerating pump lever +
-        * Rocker arm +
-        * Intermediate lever +
-        * Fast idle cam +
-        * Accelerator pump housing redesigned in 1979 ((HD Sportster Parts Catalog pg 17)) +
-        * Optional high altitude modification kit (1979)  +
-==== 1981-1983 ====+
  
-      * Accelerator pump  +==== Other HD Keihin Carburetors by Year Model ====
-      * Features/ Upgrades: +
-        * Throttle lever +
-        * Throttle stop +
-        * Fast idle cam +
-        * Fast idle cam adjusting screw +
-==== 1984-1985 ​====+
  
-      * FeaturesUpgrades+^Other HD Model^Year \\ Carb Used^Serial Number^Flange ​\\ Casting \\ Number^ ​ Main Jet \\ Size  ^Low Speed \\ Jet Size^Initial Mixture \\ screw setting^Accel Pump \\ spring position^ 
-        * Throttle lever +|All FX|76|27155-76| 860A ((Hd TSB #M713 dated June 10, 1977)) \\ 860B |185 ((Hd TSB #M713 dated June 10, 1977))|100|7/​8|center| 
-        * Throttle lever stop +|All FL|76-E77|:::​|:::​|:::​|:::​|:::​|:::​| 
-        * Voes vacuum port +|The (860B) had the longer 59.5mm accelerator pump rod. ((1966-1984 HD FL Parts Catalog (99456-84B) pg 33))|||||||| 
-        * Fast idle cam +|All FX \\ All FL|L77-E78|27155-76A ((1941-1978 Hd Electra Glide, Super Glide Parts Catalog pg 17))| 860C ((Hd TSB #M713 dated June 10, 1977)) \\ 860D |175 ((Hd TSB #M713 dated June 10, 1977))|88|1-1/​2|center| 
-        * Fast idle cam adjusting screw +|:::​|:::​|:::​|:::​|:::​|:::​|:::​|:::​| 
-==== Carburetors by Bike Year Model ====+|FX, FXE, FXS|L1978-1979|27468-78A ((1971-1984 HD FX Parts Catalog pg 27))|B81B|160|72| 
 +|FLH-80 \\ Classic|L1978-1979|27466-78A ((1966-1984 HD FL Parts Catalog ​ (99456-84B) pg 33))|B78B|165|70| 
 +|FL, FLH|L1978-1979|27467-78A ((1966-1984 HD FL Parts Catalog pg  (99456-84B) 33))|B80B|165|70| 
 +|FXS-80 \\ FXEF-80|1979|27472-79 ((1971-1984 HD FX Parts Catalog pg 27))|B79A|160|72| 
 +|FXEF|1979|27466-78A ((1971-1984 HD FX Parts Catalog pg 27))|B78A|160|72| 
 +|?​|1980|27467-80| ​ |  |  | 
 +|FLH-80 \\ Classic \\ Sidecar (79-80)|1980|27466-80A ((1966-1984 HD FL Parts Catalog pg  (99456-84B) 33))|B78D|165|68| 
 +|FL, FLH|1980|27467-80A ((1966-1984 HD FL Parts Catalog pg  (99456-84B) 33))|B80D|165|68| 
 +|FXE, FXEF, FXS|1980|27468-80A ((1971-1984 HD FX Parts Catalog pg 27))|B81D|160|72| 
 +|FXWG|1980|27470-80 ((1971-1984 HD FX Parts Catalog pg 27))|B28D|160|72| 
 +|FXS-80 \\ FXEF-80 \\ FXB|1980|27472-80A ((1971-1984 HD FX Parts Catalog pg 27))|B79D|160| 
 +|FLH-80 \\ Classic|1981-1984|27494-81A ((1966-1984 HD FL Parts Catalog pg  (99456-84B) 33))|B78F|165|70| 
 +|FXEF-80 \\ FXE-80|1981-1983|27472-81A ((1971-1984 HD FX Parts Catalog pg 29))|B79F|160 (FXEF-80) \\ 165 (FXE-80)|72| 
 +|FXS-80, FXB \\ FXWG, FXSB|1981-1983|27470-81A ((1971-1984 HD FX Parts Catalog pg 29))|B28H|160 \\ all FX models \\ (except FXE-80)|72| ​ |  | 
 +|All FX models|1984|:::​|:::​|:::​|:::​|:::​|:::​| 
 +|?​|?​|?​|02BP| ​ |  | 
 +|?​|?​|?​|02BQ| ​ |  | 
 +|All FXR, SOFTAIL|1987|27029-86B ((87-89 FLT-FXR-Softail Parts Catalog-Carb Info))|02BR|165|50| 
 +|All FLT|1987|27034-86B ((87-89 FLT-FXR-Softail Parts Catalog-Carb Info))|B88R|170|50| 
 +|All FLT, \\ FXR, SOFTAIL \\ (Ex Cal.)|1988-1989|27029-88 ((87-89 FLT-FXR-Softail Parts Catalog-Carb Info))|F58A|165|52| 
 +|All FLT, \\ FXR, SOFTAIL \\ (Cal. and Swiss only)|1988-1989|27026-88A ((87-89 FLT-FXR-Softail Parts Catalog-Carb Info))|F59B|140|42|
  
-^Model^Year \\ Carb Used^Serial Number^Flange \\ Number^Main Jet Size^Low Speed Jet Size^Idle Mixture \\ turns open^Accel Pump \\ spring position^ +  * HD part numbers are on a sticker on top of the carb on the choke cable side. Over the yearsthey may be not readable or may be missing. ​\\ Refer to the flange or ID casting numbers for specific engines used on. 
-|XLH, XLCH|Late 1976|27153-76((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|B50A ((HD Service Bulletin #M-713 dated June 101977))|(140 std) ((HD Service Bulletin #M713 dated June 10, 1977)) ​\\ Optional jets made available ((HD Parts and Accessories Bulletin dated February 8, 1977)) ​ \\ - 130, 135, 145, 150 \\ 155, 160, 165, 170, 175((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|100|7/​8 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| +  ​* 76-78 model numbers are in the side flange near the manifold
-|XLH, XLCH, XLT|1977-1978 |27153-77 ((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|B50B ((HD Service Bulletin #M-713 dated June 10, 1977)) \\ B50C |(160 std) ((1954-1977 HD Sportster Parts Supplement pg 2)) (165 std) ((HD Service Bulletin #M713 dated June 10, 1977)) \\ Optional jets made available ((HD Parts and Accessories Bulletin dated February 8, 1977)) ​ \\ 130, 135, 145, 150 \\ 155, 160, 165, 170, 175((HD Sportster Parts Catalog XLH/XLCH 99451-78B))|75|1-1/​4 ((HD Service Bulletin #M713 dated June 10, 1977))|Center ((HD Service Bulletin #M713 dated June 10, 1977))| +  * 79-up model numbers are on the lower right side ID casting block
-|XL, XLCH, XLS |1979|27469-78A ((1979 Harley Davidson Sportster Parts Catalog))|B83A|165 (160 - above 4000') ((HD Service Buletin #M-730 dated June 15, 1978 - Instruction Sheet pg 2))|0.65 mm((1979 Harley Davidson Sportster Parts Catalog))| ​ +  * Carburetors with the latest letter stamped on the flange ​had improved sealing on the welch plugs, throttle shaft ends and idle mixture screw. ((HD Service Bulletin #M713 dated June 10, 1977))
-|XL, XLS|1980|27469-80A|B83D|160|0.65 mm ((1979-1985 HD XL Parts Catalog pg 23))| +
-|XL, XLS|1981-Early 1982|27469-81A|B83F|160|0.68 mm ((1979-1985 HD XL Parts Catalog pg 25))| +
-|XL, XLS|Late 1982|27469-82|B83G|150|0.68 mm ((1979-1985 HD XL Parts Catalog pg 25))| +
-|XL, XLS, XLX|1983-1985|27469-83C|B83K|160|0.52 mm ((1979-1985 HD XL Parts Catalog pg 27))|  +
-|XLCR 1000 ((HD Service Bulletin #M713 dated June 10, 1977))|1977-1978|27148-77|B60A \\ B60B|185|90|1-1/​8 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| +
-|XLCR 1000 \\ quiet engine ((HD Service Bulletin #M713 dated June 10, 1977))|1977-|27146-77|B75A|175|90|1-1/​2 ((HD Service Bulletin #M713 dated June 10, 1977))|Upper ((HD Service Bulletin #M713 dated June 10, 1977))| +
- +
-  * Carburetors with the latest letter stamped on the flange ​have improved sealing on the welch plugs, throttle shaft ends and idle mixture screw. ((HD Service Bulletin #M713 dated June 10, 1977))+
   * Carb Idle Speed: 900 RPM ((Clymer Sportster Repair Manual 1959-1985))   * Carb Idle Speed: 900 RPM ((Clymer Sportster Repair Manual 1959-1985))
   * Torque Specs:​((1970-2010 Haynes Sportster Service and Repair Manual pgs 3.1-3.2)) Late 1976-1985, Carburetor Mounting Nuts - 19 ft/lbs (26 Nm)   * Torque Specs:​((1970-2010 Haynes Sportster Service and Repair Manual pgs 3.1-3.2)) Late 1976-1985, Carburetor Mounting Nuts - 19 ft/lbs (26 Nm)
 +  * The original idle mixture setting for E76 Keihin carbs was 1-1/2 turns out and adjust from there. ((TSB #694 dated November 7, 1975)) \\ In December of 1976, that was changed to 7-8 turns out for FL and FX models. ((HD TSB #M-707 dated December 1, 1976)) \\ In June of 1977, L77-up FL and FX models were changed back to 1-1/2 turns out with earlier models remaining at 7/8 turns.
  
 +===== Swapping to a Keihin CV Carb =====
 +See [[techtalk:​ref:​carb09|Ironhead - Installing a Keihin CV Carb]] in the REF section of the Sportsterpedia. \\
  
- +\\
- +
- +
- +
- +
-===== Keihin non-CV pics ===== +
- +
-|{{techtalk:​ih:​carb:​hoppers_77_keihin_carb_pic_1.jpg?​direct&​300|}} |{{techtalk:​ih:​carb:​hoppers_77_keihin_carb_pic_2.jpg?​direct&​300|}} | +
-|1977 Keihin 38mm non-CV pic 1((Hopper from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=247853))|1977 Keihin 38mm non-CV pic 2((Hopper from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=247853))| +
----- +
  
  
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