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Join Date: October 4, 2002
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November 9, 2004, 07:48 PM

What is jetting? Jetting involves changing the jets and shimming or replacing the needles in a carburetor. A jet is basically a screw with a precisely drilled hole in it so a certain amount of fuel passes through. Usually jetting is done to increase richness of the fuel/air mixture to compensate for increased airflow due to a less restrictive air filter and/or exhaust system. The main jet regulates fuel at mid to high rpm, the needle controls the midrange and the pilot jets and fuel or air screw control the low rpm range and off-throttle to on-throttle transitions. Each component has some overlap of the other components' range. Most bikes run lean when the leave the factory (EPA regulations), which means they can benefit from jetting if you are not looking to gain more power.

-submitted by SVBadguy
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