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techtalk:evo:carb02 [2020/09/16 05:26]
ixl2relax [CV CARBURETOR DESIGN]
techtalk:evo:carb02 [2020/10/30 21:31] (current)
ixl2relax
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 To create a proper idle operation, the Idle Port (on the engine side of the throttle plate) has a separate adjustable screw that allows some of the mixture from the Pilot Jet emulsion tube to be bled directly into the manifold, bypassing the throttle plate. To create a proper idle operation, the Idle Port (on the engine side of the throttle plate) has a separate adjustable screw that allows some of the mixture from the Pilot Jet emulsion tube to be bled directly into the manifold, bypassing the throttle plate.
  
-As the throttle plate is opened, fuel is pulled from the Transfer ​Jets and eventually, fuel is pulled thru the needle jet in greater quantity as the tapered needle is liftedby the vacuum-operated slide, out of the needle jet opening.+As the throttle plate is opened, fuel is pulled from the Transfer ​Ports. With more throttle, fuel is pulled thru the needle jetin greater quantity as the tapered needle is lifted ​out of the needle jet opening ​by the vacuum-operated slide.
  
 The constant-velocity system provides a partial means of compensating for operation at different altitudes. In a fixed system, as altitude increases, the fuel mixture becomes richer due to the thinner air. But the CV system partially compensates for this fact because the vacuum-slide oparation is also affected by the thinner air, thereby supplying less fuel into the mix. The constant-velocity system provides a partial means of compensating for operation at different altitudes. In a fixed system, as altitude increases, the fuel mixture becomes richer due to the thinner air. But the CV system partially compensates for this fact because the vacuum-slide oparation is also affected by the thinner air, thereby supplying less fuel into the mix.
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 |Heads Installed |(Stock 883, Stock 1200, Specify Brand/​Model)| |Heads Installed |(Stock 883, Stock 1200, Specify Brand/​Model)|
 |Cam Installed |(Stock D, Stock W, Specify Brand/​Model)| |Cam Installed |(Stock D, Stock W, Specify Brand/​Model)|
-|Compression Test |( Min120PSI for 883 - Min150PSI for 1200 ) |+|Compression Test |( Min120PSI for 883 - Min150PSI ​for 1200 - 2004+ Min180PSI ​for 1200 ) |
 | | | | | |
 |Ignition Module |(Stock 883, Stock 1200, Specify Brand/​Model#​)| |Ignition Module |(Stock 883, Stock 1200, Specify Brand/​Model#​)|
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 ==== Other Engine Checks ==== ==== Other Engine Checks ====
-  * Check engine compression - Keep record for later comparison ​Preferred Minimum 883=120psi - 1200=150psi+  * Check engine compression - Keep record for later comparison 
 +    * Preferred Minimum883=120psi - 1200=150psi ​- 2004+ 1200=180psi
     * Warm up engine - Try a 10-15 minute ride - let engine cool just enough to touch     * Warm up engine - Try a 10-15 minute ride - let engine cool just enough to touch
     * Remove Spark Plugs & Air Cleaner - Connect gauge to Front Cylinder     * Remove Spark Plugs & Air Cleaner - Connect gauge to Front Cylinder
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 {{:​techtalk:​evo:​carb:​cv40-enrichener-assy.jpg|}}((Pics from Phillober t=848307\\ & gm1ll t=1553245))((Annotated by IXL2Relax at the XLForum)) {{:​techtalk:​evo:​carb:​cv40-enrichener-assy.jpg|}}((Pics from Phillober t=848307\\ & gm1ll t=1553245))((Annotated by IXL2Relax at the XLForum))
  
-An XLForum Thread ​showing ​the replacement of the cable is here: http://​xlforum.net/​forums/​showthread.php?​t=848307+An XLForum Thread ​discussing ​the replacement of the cable is here (but pics are missing): http://​xlforum.net/​forums/​showthread.php?​t=848307
  
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