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« on: February 25, 2008, 05:05:12 PM »
Keep in mind that there are 3 different circuits in the carb. One for idle to about 1/4 throttle, one for 1/4 to 3/4 throttle, and the final for 3/4 throttle to wide open. It sounds like your problem is at the first part of the throttle.
There are two adjustments - one is your idle screw - which jams the throttle slightly open so the engine can get some gas while idleing. If you can get your bike to idle while slightly twisting the throttle, this is what you need to adjust.
There is also the pilot screw which affects the fuel/air ratio. Almost any carbed bike will choke if it's idling and you suddenly open the throttle. However, if you are opening the throttle normally and it is slowing down, you have too rich of a mixture.
In order to get more of everything into the mix, you may need to change your pilot jet.
To adjust the other parts of the throttle, you would mess with your needle and main jet - but to solve your idling problem, these are not part of the equation.
Check for leaks too! The WD-40 trick helps. If you do have a leak, the engine will suddenly change RPMs if you spray WD-40 onto a leaky area.