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Old 07-29-2009, 02:09 PM
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Ghost0 Ghost0 is offline
Motorized Bicycle Elite Member
Join Date: Mar 2008
Location: Bellingham, WA
Posts: 764
Default Re: problem with expansion chamber

The needle is attached to slide in your carb that your throttle cable attaches to. The needle has 4 slots in it where an e-clip goes. By raising the e-clip closer to the top of the needle it will lower the pin allowing less fuel into the engine. If you lower the clip it will raise the needle allowing more fuel into the engine. It has the greatest effect at low to mid throttle so if you still don't get the desired effect you may need to get a different jet
Design is easy, execution the hard part.
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