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There will likely be a screw on the side of the carb with a spring behind it that is idle speed; it needs to be adjusted after the engine is running. Just set it to an idle speed that is high enough to run, but low enough to not overheat. You'll need to make another adjustment after setting the pilot mixture screw.
The pilot mixture screw is a much smaller screw, and it is usually recessed in the aluminum carb body. 1.5 turns out from fully seated is a good place to start (be gentle when seating the screw). The pilot mixture screw affects the transition from idle to main, and it should be adjusted so that there is no bog or hesitation upon opening the throttle. If you need to turn it out more than two turns to get it to idle, either the slow jet (or slow jet passage) is clogged, or the slow jet is too small.
If you're uncertain about which screw is which, post some pics and we'll guide you.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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