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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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  #1  
Old 18th September 2007
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Question missfire/studder?

i have noticed that at steady rpms, not high, but more than idle under load that my engine studders slightly and sounds as if its missfiring on a cylinder. doesnt happen when i give it a fair amount of gas just when im in say 3rd gear at 30 mph and holding steady. anyone have experience with this?
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Old 18th September 2007
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Default

What kind of carb and air cleaner are you using? Have you rejetted and put in a dyno jet kit.
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Old 18th September 2007
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its a cv and yes its rejetted with 45/165 i think. and the ac is kinda like a small "big sucker"
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Old 18th September 2007
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would the voes have anything to do with that? maybe an intake leak?
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Old 18th September 2007
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Default needle adjustment

Sounds like you need to adjust the needle to get a slightly richer mixture. It's probally going lean on you during the transition from pilot to main jet. Assuming the needle is stock and has not been modified.
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