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--- techtalk:ref:carb07 [2019/10/15 00:00]
hippysmack [EZ-Just Mixture Screws]
+++ techtalk:ref:carb07 [2024/01/12 00:02] (current)
hippysmack
@@ Line 1: / Line 1: @@
 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
 ====== REF: Carburetor, Intake Manifold & Exhaust ======
-====== Keihin Carb Upgrades - Butterfly and CV Types ======
+====== Keihin Carb Upgrades & Aftermarket - For Butterfly and CV Types ======
 \\
-====== Extended Idle Speed Screw ======
+====== Idle Speed Screw ======
+**Factory Idle Speed Screw - Modding**\\
+You can stick a dime in the adjuster screw slot and braze it to the screw to make future adjustments by hand. \\
+{{:techtalk:ref:carb:keihin_carb_1_by_ddddylan_-_annotated.jpg?direct&300|}} ((photo by DDDDylan of the XLFORUM, annotated by Hippysmack))
+**CVP Extended Idle Speed Screw**\\
 Below is a CVP stainless steel idle speed screw for Harley CV and Keihin butterfly style carburetors. \\
 With the extended thumbscrew, idle speed can be adjusted by hand. \\
@@ Line 13: / Line 20: @@
 |{{:techtalk:ref:carb:cv_carb_with_extended_idle_speed_screw_by_hippysmack.jpg?direct&300|}}|
-====== Aftermarket Idle Mixture Screws and Mods ======
 \\
-===== EZ-Just Mixture Screws =====
+====== Needle & Emulsion Tube ======
+\\
+Changes in the needle and emulsion tubes from aftermarket vendors may modify the (stock/oem) AFR from just off idle thru wide-open throttle. The length and size of the needle as it moves thru the needle jet along with the size and placement of the holes in the emulsion tube, will determine the air-fuel ratio of the fuel. Along with the other operating parts of the carb, they affect how well the engine operates under each varying condition.
+CV Performance offers two aftermarket needles, Velocity & N65, and one emulsion tube, Velocity. The CVP N65 is designed as an equivalent alternative to the Keihin N65C needle, which HD & Keihin have stopped producing. The Velocity Needle & Velocity Emulsion tube are designed to provide a different AFR.
+Using unknown parts or parts designed to radically alter the carb operation to favor one specific enhancement will often complicate or degrade the overall smooth operation of the carb.
+{{:techtalk:ref:carb:cvp-partsforcv40-1.jpg?600|}} ((pics from BestCoastXL at https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/202758-should-i-buy-carb-parts-from-amazon-rather-than-cv-performance-no-you-should-not?t=2079965 - Annotated by IXL2Relax))
+====== Idle Mixture Screw - IMS - Aftermarket & Mods ======
+\\
+**CVP EZ-Just IMS**\\
 The EZ-Just mixture screw (for L76-87 or 88-06 models) ((https://cv-performance.com/ez-just-mixture-screw-81-87-harley-keihin)) ) can be purchased with an extended screw head for hand tuning. \\ You can buy packing from CVP also in case yours has been damaged or is not functioning properly. \\ But, check your local regulations before changing this out to an aftermarket part. \\ You can also find, buy or barter for used parts. \\ ("Please note: it is a violation of federal law to tamper with or disable any emission or noise control device. That is your PSA for the day"). ((XLForum member - chrishajer)) \\
@@ Line 22: / Line 41: @@
 Then pry the plug out using a pick or you could twist a small sheet metal screw into the hole to pull the plug out. \\
 With the plug removed clean the area around the mixture screw so no metal fragments remain. \\
-{{techtalk:evo:carb:cv40-imscap-drillbit.jpg?300|}} ((photo by cantolina of the XLFORUM http://xlforum.net/forums/showthread.php?t=14949)) Circled area is where you drill out the plug. {{:techtalk:ref:carb:cv_carb_bottom_by_cantolina.jpg?direct&300|}} ((photo by cantolina of the XLFORUM http://xlforum.net/forums/showthread.php?t=14949))
+{{techtalk:evo:carb:cv40-imscap-drillbit.jpg?300|}} ((photo by cantolina 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/9621-carb-adjusting-where-are-the-jets-and-the-mixture-screw?t=14949)) Circled area is where you drill out the plug. {{:techtalk:ref:carb:cv_carb_bottom_by_cantolina.jpg?direct&300|}} ((photo by cantolina 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/9621-carb-adjusting-where-are-the-jets-and-the-mixture-screw?t=14949))
 The EZ-Just mixture screw must be threaded in completely (lightly seated) prior to backing out and making final adjustments. \\
@@ Line 35: / Line 54: @@
 {{:techtalk:ref:carb:ez_just_idle_mixture_screw_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\
-===== 88-06 =====
+**CVP EZ-Just IMS Used on 1988-06 CV40 Carbs**
 This screw is billed as "Easily tune and adjust your idle mixture without burning your hands or fumbling with a screwdriver." ((https://cv-performance.com/ez-just-mixture-screw)) \\
 This is not entirely true as you have to get your hand between the exhaust and air cleaner. \\
@@ Line 45: / Line 64: @@
 If you take off the bowl, be sure to check the float setting before reinstalling the bowl. \\
-|  EZ-Just Screw in it's 'lightly seated' position. ((photo by Matt Black of the XLFORUM http://xlforum.net/forums/showthread.php?t=2068828&page=6))  ||
+|  EZ-Just Screw in it's 'lightly seated' position. ((photo by Matt Black 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/193103-newbie-cv-rebuild/page6?t=2068828&page=6))  ||
 |{{:techtalk:ref:carb:ez_screw_lightly_seated_1_by_matt_black.jpg?direct&300|}}|{{:techtalk:ref:carb:ez_screw_lightly_seated_2_by_matt_black.jpg?direct&300|}}|
@@ Line 51: / Line 70: @@
 |{{:techtalk:ref:carb:ez-just_88-06_a-f_mixture_screw_1_by_hippysmack.jpg?direct&300|}} ((photo byHippysmack))| {{:techtalk:ref:carb:ez-just_88-06_a-f_mixture_screw_2_by_hippysmack.jpg?direct&300|}} ((photo byHippysmack))|{{:techtalk:ref:carb:ez-just_88-06_a-f_mixture_screw_3_by_hippysmack.jpg?direct&300|}} ((photo byHippysmack))|
-===== Idle Mixture Thumbscrew Mods =====
+**CVP Easy-Just IMS - Modding**\\
+From RandallM of the XLForum((Post#80 - https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/203772-jet-hole-size-chart?t=2081062)) - Here is how I indexed my screw. I filed some small flats on a small nail, and JB Welded it in the slot. I left the small end sticking out a bit so I can feel both ends.
+{{techtalk:ref:carb:cvp-easyjust-ims-mod6.jpg?direct&300|}}
+**Factory IMS - Modding**\\
 Several mods to the thumbscrew have been done to make counting turns while turning the screw easier. \\
-|The aftermarket thumb screw head doesn't a slot for a screwdriver (which also serves as a visual for position). \\ A small hole drilled off center will give a visual position of the screw for adjustment later. ((photos by sifty of the XLFORUM http://xlforum.net/forums/showthread.php?t=1592463&page=48))||
+|The aftermarket thumb screw head doesn't have a slot for a screwdriver (which can serve for visual positioning). \\ A small hole drilled off center will give a visual position of the screw for adjustment later. ((photos by sifty of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/146604-first-harley-1975-xl1000-caf%C3%A9-project/page48?t=1592463&page=48))||
 |{{:techtalk:evo:carb:idle_mixture_screw_3_by_sifty.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_4_by_sifty.jpg?direct&300|}}|
-This replacement needle makes it so much easier to adjust the idle mixture. ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=183642)) \\
+This replacement needle makes it so much easier to adjust the idle mixture. ((Folkie 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/47776-idle-mixture-needle-mod?t=183642)) \\
 However, it is easier to count the turns by hand with this mod. \\
 A spigot was added to the face of the knob. \\
@@ Line 63: / Line 91: @@
 Then the side nearest the air cleaner (right of bike) was marked to index when to stop turning to the right. \\
 The needle was then removed, drilled and tapped (10 BA) for the spigot. \\
-You can also drill hole through the knob from side to side and Superglue a screw in it. ((Hot Rod Sporty of the XLFORUM http://xlforum.net/forums/showthread.php?t=183642)) \\
+You can also drill hole through the knob from side to side and Superglue a screw in it. ((Hot Rod Sporty 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/47776-idle-mixture-needle-mod?t=183642)) \\
 The EZ-Just makes it easy to adjust the idle mixture by hand without a screwdriver. \\
-But, if you've gone 3 to 3-1/2 turns out, then change to the next biggest slow jet. ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=183642)) \\
+But, if you've gone 3 to 3-1/2 turns out, then change to the next biggest slow jet. ((Folkie 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/47776-idle-mixture-needle-mod?t=183642)) \\
-|  Spigot installed to count the turns. ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=183642))  |
+|  Spigot installed to count the turns. ((photo by Folkie 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/47776-idle-mixture-needle-mod?t=183642))  |
 |{{:techtalk:evo:carb:idle_mixture_screw_mod_by_folkie.jpg?direct&300|}}|
-===== Modding a Factory Mixture Screw =====
+**Factory IMS - Modded Head**
 This was done to extend the factory idle mixture screw. \\
 A piece of 3/16" brass tubing and a knurled nut from the hardware store. \\
-|  Factory idle mixture screw extended. ((photos by tchuck of the XLFORUM http://xlforum.net/forums/showthread.php?t=183642))  ||
+|  Factory idle mixture screw extended. ((photos by tchuck 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/47776-idle-mixture-needle-mod?t=183642))  ||
 |{{:techtalk:evo:carb:idle_mixture_screw_mod_2_by_tchuck.jpg?direct&300|}}|{{:techtalk:evo:carb:idle_mixture_screw_mod_3_by_tchuck.jpg?direct&300|}}|
 \\
-===== Modding a Factory Idle Speed Screw =====
-You can stick a dime in the adjuster screw slot and braze it to the screw to make future adjustments by hand. \\
-{{:techtalk:ref:carb:keihin_carb_1_by_ddddylan_-_annotated.jpg?direct&300|}} ((photo by DDDDylan of the XLFORUM, annotated by Hippysmack))
 ====== Velocity Stack ======
@@ Line 91: / Line 116: @@
 "Bolt-on performance that installs in minutes" although no performance enhancements have been found while using them. \\
 Aluminum type velocity stacks like the "V-Ductor" from CV Performance have been used and tested to find no HP gains from them.
-Some may still cite 'peace of mind' and there is no downside to using it other than the price.
+Some may still cite 'peace of mind' and there is no downside to using it other than the price. \\
 It requires a total of 2 gaskets (included) to install. ((photos by Hippysmack)) \\
+This is a "V-Ductor" from CV Performance. ((https://cv-performance.com/v-ductor-installation)) \\
 |{{:techtalk:ref:carb:velocity_stack_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:carb:velocity_stack_2_by_hippysmack.jpg?direct&300|}}|
+  * Remove the air cleaner backing plate.
+  * Place a gasket onto the backing plate, then the V-Ductor and another gasket (2 supplied in the kit).
+  * The smaller end of the cone faces into the carb.
+  * Install the new assembly onto the carb and torque to factory specs.
+  * backing plate with as normal against the V-Ductor. Installation of your air box will vary depending upon the
 |{{:techtalk:ref:carb:velocity_stack_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:carb:velocity_stack_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:carb:velocity_stack_5_by_hippysmack.jpg?direct&300|}}|
 ====== Replacing the Plastic Fuel Inlet Fitting with a Brass 90 Degree Fitting ======
@@ Line 110: / Line 140: @@
 |{{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_7_by_hippysmack.jpg?direct&300|}}|
-|  Keihin butterfly (non CV). Here is on way to do it. Break the plastic off and run a hose on the factory brass nipple. ((photos by Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=209347&highlight=float+level&page=21))  |||
+|  Keihin butterfly (non CV). Here is on way to do it. Break the plastic off and run a hose on the factory brass nipple. ((photos by Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page21?t=209347&highlight=float+level&page=21))  |||
 |{{:techtalk:ref:carb:keihin_butterfly_carb_23_by_hopper.jpg?direct&300|}}|{{:techtalk:ref:carb:keihin_butterfly_carb_24_by_hopper.jpg?direct&300|}}|{{:techtalk:ref:carb:keihin_butterfly_carb_25_by_hopper.jpg?direct&300|}}|
 Replacing the the hipple with a brass elbow is detailed below. \\
 ===== Tools =====
@@ Line 126: / Line 157: @@
 {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_tools_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack))
 ===== Part Considerations =====
   * Brass 90° elbow
@@ Line 211: / Line 241: @@
 I pre-made puller was bought for the pics below. \\
 But you can also use a 1/4'x20 threaded rod about a foot long screwed into the fitting. \\
-Then slip a thin piece of pipe nipple over the rod with a washer and nut onto the end of the rod. ((tgrover of the XLFORUM http://xlforum.net/forums/showthread.php?t=501871)) \\
+Then slip a thin piece of pipe nipple over the rod with a washer and nut onto the end of the rod. ((tgrover of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/72657-what-carb-is-this-and-how-do-i-set-it-up?t=501871)) \\
 Place the spacer (or deep socket) over the brass nipple. \\
@@ Line 223: / Line 253: @@
 A socket may be used as a spacer with the appropriate length bolt. \\
-{{:techtalk:ref:carb:socket_as_spacer_for_removing_cv_carb_inlet_by_matt_black.jpg?direct&300|}} ((photo by Matt Black of the XLFORUM http://xlforum.net/forums/showthread.php?p=5685578&highlight=fuel+inlet+elbow#post5685578)) \\
+{{:techtalk:ref:carb:socket_as_spacer_for_removing_cv_carb_inlet_by_matt_black.jpg?direct&300|}} ((photo by Matt Black 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/193103-newbie-cv-rebuild/page7?highlight=fuel+inlet+elbow#post4213142)) \\
 {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_17_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_18_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_19_by_hippysmack.jpg?direct&300|}}
@@ Line 252: / Line 282: @@
 Blow the passage out again to ensure of no debris before installing the bowl. ((photos by Hippysmack)) \\
 {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_40_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_41_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:carb:cv_fuel_inlet_elbow_mod_42_by_hippysmack.jpg?direct&300|}} \\
-====== 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)) \\
-This kit can be purchased online. It comes with an installation guide and index pointer. \\
-The tool marks inside of the float bowl (as installed) for drilling the proper sized hole to thread in the adjustable main jet.\\
-The kit can be purchased online. \\
-PDF instructions - [[http://www.vtwinmfg.com/instructions/35/35-0369.pdf]] \\
-{{:techtalk:ref:carb:keihin_butterfly_adjustable_main_jet_35-0369.jpg?direct&300|}} \\
-This replaces the main jet (has to be removed). \\
-The float bowl has to be removed to install the adjustable main jet. \\
-A guide tool is included with the kit to install the new jet to properly index the carburetor float bowl. \\
-A index pointer is installed in the guide, bowl reinstalled and the pointer is pushed down from inside the venture to dimple the bowl. \\
-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) \\
-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. \\
-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 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. \\
-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.
-The adjustable jet set screw is turned in, towards the float bowl to lean the fuel/air mixture and out from the float bowl to richen the mixture. \\
-Check plugs frequently after jet adjustment, exhaust or A/C to avoid too lean or too rich conditions. \\
-|{{: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|}}|

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