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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #21  
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Quote:
Originally Posted by AIE10 View Post
Now the vacuum line from petcock was definitely causing the idle to drop a small amount when I disconnected it a blocked the vacuum port off on the carby. Not sure if fuel is getting sucked through or not..
Not following your wording, but if you are still using a vacuum operated petcock and the diaphragm has never been replaced, it is past time to do so or convert to a mechanical petcock.

Vacuum goes from carb with T to vacuum petcock and VOES.

Vacuum loss (if there is a vacuum loss) potential is
a. hose cracked
b. T cracked
c. vacuum operated petcock vacuum diaphragm cracked, which would suck fuel, instead of air
d. VOES diaphragm cracked
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there is an air bleed involved in idle circuit.looking in carb opening with a/c off located toward bottom very small hole (1/16 ?).spray carb cleaner & blow out with air.
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Quote:
Originally Posted by AIE10 View Post
Now the vacuum line from petcock was definitely causing the idle to drop a small amount when I disconnected it a blocked the vacuum port off on the carby.
By removing the vacuum hose from the carb, you are causing the VOES to switch to the Retarded Curve (less Advanced Timing - if the VOES is working correctly). Note this from the Sportsterpedia:

"When the engine is running at idle, when lightly accelerating or when using a steady cruise throttle, manifold vacuum is high (the throttle plate is mostly closed) and the VOES switch is ON, causing the ICM to use the MORE ADVANCED CURVE."

Quote:
Originally Posted by wtwolf View Post
there is an air bleed involved in idle circuit.looking in carb opening with a/c off located toward bottom very small hole (1/16 ?).spray carb cleaner & blow out with air.
See the pics in the Sportsterpedia:
http://sportsterpedia.com/doku.php/techtalk:evo:carb02

And if you haven't, I would again suggest looking carefully at the placement of the throttle plate...

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