i would try a richer pilot first. if that doesn't work try a leaner one. BUT more importantly - if you shut the airscrew down, the bike should stall out. if it does not, you may have your idle screw in too far or your slide is not going all the way down, and you are completely bypassing the pilot circuit. does this bike idle on it's own for 10-15 seconds at least before it stalls? and at 1000-1500rpm? or do you have the idle screw cranked way in to make it idle?
if the airscrew has no effect, you are probably bypassing the circuit....when the slide is all the way down and resting on the idle screw, you should just barely see daylight through the bottom of the slide. does the slide clunk down on the idle screw when close the throttle? if it does not the freeplay in the throttle cable may be not enough.
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