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techtalk:evo:carb01 [2019/10/27 17:38]
hippysmack [Sub Documents]
techtalk:evo:carb01 [2020/05/17 20:41] (current)
ixl2relax
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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]] 
- 
- 
-\\ 
  
 ====== Overview ====== ====== Overview ======
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 From 1986-1987, the stock Sportster carburetor was a Keihin 34mm, fixed-venturi "​butterfly"​ model, as used on the Ironhead models from 1979 onward (BT models still used the 38mm version). Contrary to popular folklore, all Keihin non-CV carbs did come with accelerator pumps. From 1986-1987, the stock Sportster carburetor was a Keihin 34mm, fixed-venturi "​butterfly"​ model, as used on the Ironhead models from 1979 onward (BT models still used the 38mm version). Contrary to popular folklore, all Keihin non-CV carbs did come with accelerator pumps.
  
-In 1988, the stock Sportster carburetor was upgraded to a Keihin 40mm, slide-type, constant-velocity model. It was quickly discovered that the lack of an accelerator pump was a shortcoming. To help that situation, a special needle, identified as 27094-88 or N65C, was used to help off-idle performance in the 1988 models.+In 1988, the stock Sportster carburetor was upgraded to a Keihin 40mm, slide-type, constant-velocity model. It was quickly discovered that the lack of an accelerator pump was a shortcoming. To help that situation, a special needle, identified as 27094-88 or N65C, was used to help off-idle performance in the 1988 models, which still had no accelerator pump.
  
 In 1989 and thru 2006, the Keihin CV40 carburetors were produced with an accelerator pump to smooth out initial throttle response. In 1989 and thru 2006, the Keihin CV40 carburetors were produced with an accelerator pump to smooth out initial throttle response.
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 \\ \\
  
-====== Keihin Butterfly (non-CV) Carburetor (Stock on 1976L-1987) ======+====== Keihin Butterfly (non-CV) Carburetor (Stock on L1976-1987 Sportsters) ======
   * 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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 ====== Keihin CV 40mm Carb (1988-2006) ====== ====== Keihin CV 40mm Carb (1988-2006) ======
 +\\
 +===== Sub Documents =====
 +
 +  * [[techtalk:​evo:​carb01b|Keihin CV Carb Identification]]
 +  * [[techtalk:​evo:​carb01a|Rebuilding the Keihin CV Carb]]
 +  * [[:​techtalk:​evo:​carb02|Keihin CV40 Carb Functions, Adjustments,​ Tuning]]
 +
 +
 +----
 +
 +
 +
 +
   * 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. ​   * 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. ​
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 ---- ----
  
-**Serial Number:** 
-  * Labeled on the adjacent side to the accelerator pump linkage 
- 
-Example 27231-98 translates to  
-|Keihin CV Serial Number|Year of Introduction|Notes| 
-|      27231                 ​| ​   1998      | Can be used on same year and / or future multiple models| 
- 
-\\ 
  
 ===== Factory Keihin CV40 Carburetors by Sportster Model/Year ===== ===== Factory Keihin CV40 Carburetors by Sportster Model/Year =====
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 \\ \\
  
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- 
-===== Pics of Keihin CV40 Carbs ===== 
-(Factory Installed) --- Click on a picture to enlarge: 
- 
- 
-**Keihin CV40 #27731-04** 
-|Used on 2004-2006 (Domestic models) 1200C, 1200R((Photo by rocketmangb of the XLFORUM))||| 
-|{{techtalk:​evo:​carb:​27731-04_keihin_cv_by_rocketmangb.jpg?​direct&​300|}}||| 
- 
- 
----- 
- 
-**Keihin CV40 #​27498-96A** 
-|Used on 1998, 2002-2003 (California models) 1200, 1200C ((photos courtesy of blackbikedave of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​threadid=2013441))||| 
-|{{:​techtalk:​evo:​carb:​cv-1_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-2_27498-96a_by_blackbikedave.jpg?​direct&​300|}}|{{:​techtalk:​evo:​carb:​cv-6_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 ===== 
- 
-  * [[techtalk:​evo:​carb01f|Repairing a Broken Enrichener Knob]] \\ 
-\\ 
- 
-The CV40 has an Enrichener Circuit - The knob is labeled '​Choke'​ but that is a misnomer. **It is not a choke**. \\ 
-A choke sends less air into the venture when closed thus richening the mix. \\ 
-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). \\ 
- 
-{{:​techtalk:​evo:​carb:​enrichener_cable_1_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack)) \\ 
- 
-The enrichener knob should stay open and remain open when pulled out and close without binding when pushed in. \\ 
-Pulled out engages the enrichment circuit and adds extra fuel into the venture. \\ 
-Pushed in closes off the enrichment circuit stopping extra fuel from entering. Read more about it's function [[techtalk:​evo:​carb02#​enrichener_function_choke|here]]. \\ 
-To adjust the knob, gently pull it out to the full length and let go. Do not pull hard or at an angle or it could break the knob. \\ 
-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. \\ 
-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. \\ 
-  
-{{:​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)) ​ 
-{{:​techtalk:​evo:​carb:​enrichener_cable_4_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack)) \\ 
- 
-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.