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techtalk:evo:carb01 [2019/08/04 18:39]
hippysmack [Aftermarket Idle Mixture Screw and Mods]
techtalk:evo:carb01 [2019/10/27 17:38] (current)
hippysmack [Sub Documents]
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 [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]] [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]]
 ====== EVO: Carburetor, Intake Manifold & Exhaust ====== ====== EVO: Carburetor, Intake Manifold & Exhaust ======
 +===== Sub Documents =====
 +
 +  * [[techtalk:​evo:​carb01a|Rebuilding the Keihin CV Carb]]
 +  * [[:​techtalk:​evo:​carb02|Keihin CV40 Carb Functions, Adjustments,​ Tuning]]
  
  
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 \\ \\
  
-====== Keihin non-CV Carburetor (Stock on 1976L-1987) ======+====== Keihin ​Butterfly (non-CVCarburetor (Stock on 1976L-1987) ======
   * 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))
   * The throttle body casting contains an integral venturi and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a boss. The main jet screws into the boss and holds the bleed tube in place.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM))    * The throttle body casting contains an integral venturi and a fuel valve seat that is pressed into the body. The underside of the throttle body contains a boss. The main jet screws into the boss and holds the bleed tube in place.((1970-1978 HD XL/​XLH/​XLCH/​XLT 1000 FSM)) 
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     * **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))
 +  * Dual throttle cables
   * Integral Float Chamber   * Integral Float Chamber
   * Manual Choke   * Manual Choke
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   * Fixed jets   * Fixed jets
   * Factory preset idle mixture   * Factory preset idle mixture
-  * For those sold for use in California (as part of the evaporative emissions kit) the fuel overflow fitting was capped and the overflow line was removed. ((HD Service Bulletin #M-905 dated August 26, 1985)) +  * VOES port 
 +  * Evaporative port \\ **Note**: \\ For those sold for use in California (as part of the evaporative emissions kit) the fuel overflow fitting was capped and the overflow line was removed. ((HD Service Bulletin #M-905 dated August 26, 1985))
  
  
-===== Factory Keihin non-CV 34mm Carb by Sportster Model/Year ===== 
  
-^Sportster Model^Year^Keihin Non-CV 34mm \\ Carb Serial # ^Main / Slow \\ Jet Size ((Cross-reference numbers by Folkie ​ from the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2006132&​page=7))^Main / Slow \\ Jet Part #s| +===== Factory Keihin Butterfly (non-CV) 34mm Carb by Sportster Model/Year ===== 
-|**XLH 883, '87 XLH 883/​Hug** ​(50 States)|1986-1987|27501-86A ​(B83H)|155((1986-1990 HD XLH FSM pg 4-1)) 52((1986-1990 HD XLH FSM pg 4-1))|(27089-78) - (27329-83)|  +Note: Carb B83H was also used on 1983 Sportster models. \\ 
-|**XLH 1100** (50 States)|1986|27502-86B (B83H)|155((1986-1990 HD XLH FSM pg 4-1)) 52((1986-1990 HD XLH FSM pg 4-1))|(27089-78) - (27329-83)+See a full list of all known Harley Keihin butterfly carbs here [[techtalk:​ih:​carb01#​sportster_keihin_butterfly_carburetors_by_year_model|Sportster Keihin Butterfly Carburetors by Year Model]] in the ironhead section of the Sportsterpedia. 
-|**XLH 1100** (50 States)|1987|27502-86B ​(B83H)|150((1986-1990 HD XLH FSM pg 4-1)) / 52((1986-1990 HD XLH FSM pg 4-1))|(27087-80) - (27329-83)|  +^Sportster Model^Year \\ Carb Used^HD Part Number^Flange \\ Number^  ​Main Jet \\ Size  ^Low Speed \\ Jet Size^Initial Mixture \\ screw setting^Accel Pump \\ spring position^ 
-|Main & Slow jet sizes are the same (86-87) 883 & (86) 1100. BUT - Due to internal differences,​ the carbs are not interchangeable ((1986-1990 HD XLH FSM pg 4-1))|||||+|XL 883 (50 state)|1986-1987|27501-86A ((1986-1987 HD Sportster Parts Catalog ​pg 21))|B83H|155|52| 
 +|XL 1100 (50 state)|1986|27502-86A ((1986-1987 HD Sportster Parts Catalog ​pg 21))|B83H|155|52| 
 +|XL 1100 (50 state)|1987|27502-86B ((1986-1987 HD Sportster Parts Catalog ​pg 21))|B83H|150|52|
  
 +  * Main & Slow jet sizes are the same (86-87) 883 & (86) 1100. BUT - Due to internal differences,​ the carbs are not interchangeable ((1986-1990 HD XLH FSM pg 4-1)) \\
 +  * Main Jet
 +    * 27087-80 - 1.50mm
 +    * 27098-78 - 1.55mm (std)
 +  * Slow Jet
 +    * 27329-83 - .52mm
  
-  * Note: Main and slow jet sizes are the same for the 86-87 883 and the 86 1100 carbs. But, due to internal differences,​ the carbs are not interchangeable.((1986-1990 HD XLH FSM)) 
    
 |Carb Idle Speed| 900 RPM ((Clymer Sportster Repair Manual 1959-1985))|| |Carb Idle Speed| 900 RPM ((Clymer Sportster Repair Manual 1959-1985))||
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-===== Pics of Keihin non-CV Carbs ===== 
-(Factory Installed Carbs) 
  
-|{{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))| 
  
 \\ \\
  
  
-====== Keihin BD ======+====== Keihin BD / Screaming Eagle Carb ====== 
 +//​Harley-Davidson motorcycles equipped with some Screamin’ Eagle® high-performance engine parts may not be used on public roads. \\ 
 +(and in some cases must be restricted to closed course competition) \\ 
 +This engine related performance part is intended for racing applications and is not legal for sale or use in California on pollution controlled motor vehicles. \\ 
 +//
   * Used in the Screaming Eagle Package line from HD as an Evolution XLH HI-FLO Carburetor & Air Cleaner. The carb was a (27001-88)   * Used in the Screaming Eagle Package line from HD as an Evolution XLH HI-FLO Carburetor & Air Cleaner. The carb was a (27001-88)
 +  * The kit Number is 29081-90C for 86 and later Sportsters.
   * Adjustable Accelerator Pump stroke   * Adjustable Accelerator Pump stroke
   * Incorporated a special intake manifold to carb spacer that had to be drilled and tapped (1/4 x 28) in the side for included Voes connection adapter ​     * Incorporated a special intake manifold to carb spacer that had to be drilled and tapped (1/4 x 28) in the side for included Voes connection adapter ​  
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  ​((http://​xlforum.net/​forums/​showthread.php?​t=132922)) ​   ​  ​((http://​xlforum.net/​forums/​showthread.php?​t=132922)) ​   ​
                                                                                                                            
 +
 +{{:​techtalk:​evo:​carb:​se_carb_functions.jpg?​direct&​300|}}
 +
 +{{:​techtalk:​evo:​carb:​se_high_flow_carb_1_by_88hugger.jpg?​direct&​300|}} ((photo by 88hugger of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=1906502#​post1906502)) ​ {{:​techtalk:​evo:​carb:​se_high_flow_carb_2_by_88hugger.jpg?​direct&​300|}} ((photo by 88hugger of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=1906502#​post1906502)) \\
  
 \\ \\
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 ====== Keihin CV 40mm Carb (1988-2006) ====== ====== Keihin CV 40mm Carb (1988-2006) ======
   * Constant velocity, gravity fed - has a float-operated inlet valve and a vacuum-operated variable venturi (movable slide).   * Constant velocity, gravity fed - has a float-operated inlet valve and a vacuum-operated variable venturi (movable slide).
 +  * Both the CV40 and CVK carbs are made by Keihin in Japan. But only the CV is specific to a Harley and has the bar and shield and HD name on the side. ((CVPerformance of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1729649&​page=2)) \\ CVK is for Kawasaki and various other makes that contracted Keihin for that carburetor. \\ There is also a CV40 making the rounds that is distributed by a Florida company that looks identical but not all the specs match up. \\ There is no guarantee that any part (original or CVP) will fit those knock-off carburetors. \\ If your CV carb does not have the name Harley Davidson cast above the bowl on each side it is a knock-off. ​
  
 ^Torque Specs ^^^ ^Torque Specs ^^^
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 |{{:​techtalk:​evo:​carb:​cv-3_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-4_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-5_27498-96a_by_blackbikedave.jpg?​direct&​300|}}| |{{:​techtalk:​evo:​carb:​cv-3_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-4_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-5_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|
  
 +====== Enrichment Cable ======
 +===== Sub Documents =====
  
-====== Aftermarket Idle Mixture Screw and Mods ======+  * [[techtalk:​evo:​carb01f|Repairing a Broken Enrichener Knob]] \\ 
 +\\
  
-The EZ-Just is easy to adjust the idle mixture by hand without ​screwdriver. \\ +The CV40 has an Enrichener Circuit ​The knob is labeled '​Choke'​ but that is a misnomer. **It is not a choke**. \\ 
-But, if you've gone 3 to 3-1/2 turns out, then change ​to the next biggest slow jet. ((Folkis of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=183642)) \\ +A choke sends less air into the venture when closed thus richening the mix. \\ 
-===== L76-87 =====+An enrichener shoots gas into the venture thus richening the mix. \\ 
 +It may seen more semantic ​to call them different names but it is important ​to realize that the two have different functions to the same end\\ 
 +(to richen ​the mix for better starting)\\
  
-An aftermarket kit (like E-Z-just for L76-87 models ((https://​cv-performance.com/​ez-just-mixture-screw-81-87-harley-keihin)) ) can be purchased with an extended screw head for hand tuning. \\ It comes with the "​packing"​ 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 noteit 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)) \\+{{:techtalk:evo:​carb:​enrichener_cable_1_by_hippysmack.jpg?​direct&​300|}} ​((photo by Hippysmack)) \\
  
-|  Stock idle mixture screw ((photo by sifty of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1592463&​page=48)) ​ |  Stock mixture screw (top) compared to the \\ E-Z-Just mixture screw (bottom) ((photo by sifty of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1592463&​page=48)) ​ | +The enrichener knob should stay open and remain open when pulled out and close without binding when pushed in. \\ 
-|{{:​techtalk:​evo:​carb:​idle_mixture_screw_1_by_sifty.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​idle_mixture_screw_2_by_sifty.jpg?​direct&​300|}}| +Pulled out engages ​the enrichment circuit and adds extra fuel into the venture. \\ 
- +Pushed in closes ​off the enrichment circuit stopping extra fuel from enteringRead more about it's function [[techtalk:​evo:​carb02#​enrichener_function_choke|here]]\\ 
-|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))|||  +To adjust the knob, gently pull it out to the full length and let goDo not pull hard or at an angle or it could break the knob. \\ 
-|{{:techtalk:​evo:​carb:​idle_mixture_screw_3_by_sifty.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​idle_mixture_screw_4_by_sifty.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​idle_mixture_screw_5_by_sifty.jpg?​direct&​300|}}| +Tension from the plastic nut behind the knob keeps it from pulling back in. If it tries to pull back in on it's own, the plastic nut isn't tight enough. \\ 
- +You can tighten it with one hand by hold the knob all the way out with your finger and using you thumb and next finger ​to tighten. \\ 
-===== 88-06 ===== +There is no need to take it off the bracket ​for this. You just want to create enough resistance to keep the knob from pulling ​in on it's own. \\ 
- +**Caution**, ​the plastic nut fits onto plastic threads and should not be tightened too much or the threads will strip\\ 
-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)) ​\\ +  
-However, ​it is easier ​to count the turns by hand with this mod. \\ +{{:​techtalk:​evo:​carb:​enrichener_cable_3_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack)) {{:​techtalk:​evo:​carb:​enrichener_cable_2_by_hippysmack.jpg?​direct&​300|}} ​((photo by Hippysmack))  
-A spigot was added to the face of the knob. \\ +{{:​techtalk:​evo:​carb:​enrichener_cable_4_by_hippysmack.jpg?​direct&​300|}} ​((photo by Hippysmack)) ​\\
-The needle was screwed in all the way to gentle seat. \\ +
-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)) ​\\ +
- +
-|  Spigot installed to count the turns. ((photo by Folkie of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=183642)) ​ | +
-|{{:​techtalk:​evo:​carb:​idle_mixture_screw_mod_by_folkie.jpg?​direct&​300|}}+
- +
-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))  || +
-|{{:​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|}}+
- +
- +
- +
-\\+
  
 +If the plastic nut has stripped out, you can cut a piece of rubber tubing, ​ slit it long ways and stick it between the nut and the knob when needed. ((cantolina of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=447983)) \\
 +Then when you remove it, slip it on the throttle cable until the next cold startup. \\
 ====== Discrepancies in the FSM(s) / Parts Catalog(s) ====== ====== Discrepancies in the FSM(s) / Parts Catalog(s) ======
 Upon perusing 1986-2006 Parts Catalogs for carburetor information,​ it's clear that the MoCo was trying to save space in these books at the expense of legibility. Below is a chart showing the initial intentions on the top and the MoCo's mis-interpretations on the bottom. They give no notations (from year to year book) on any changes to the nomenclature. I.E. one way to display a year/ model number is displayed differently in other year books. This chart is not complete nor factual in numbering but as an example only.  Upon perusing 1986-2006 Parts Catalogs for carburetor information,​ it's clear that the MoCo was trying to save space in these books at the expense of legibility. Below is a chart showing the initial intentions on the top and the MoCo's mis-interpretations on the bottom. They give no notations (from year to year book) on any changes to the nomenclature. I.E. one way to display a year/ model number is displayed differently in other year books. This chart is not complete nor factual in numbering but as an example only.