It's the idle adjustment screw. Get some locktite. Lift your tank. Look for the throttle linkage (twist the throttle, and you'll see it move) and locate the adjustment screw (it's the one facing the back of the bike). put a few drops of locktite on the threads inside the spring. Tighten the screw until the bike idles at 1100-1200 rpms (1150 work well). Bolt the tank back down.
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