The fuel screw (or pilot screw) only comes into play once you open the throttle. It is responsible for the transition from the idle jet to the main jet. If you need to open the screw more than two turns for a smooth transition, the slow jet is either clogged or too small.
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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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