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Is the bike not running right with stock jetting?
If it doesn't bog at low throttle or bluber at high RPM's the jetting is correct.
Before you start messing with the jetting, begin by adjusting the air/fuel mixture screw. After the bike is warmed up and the engine idling, turn the screw in our out slowly untill you hear the motor revs are the highest. That will improve your responsivness off idle.
When I had this bike I jetted the bike according to this site: http://www.off-road.com/dirtbike/feature/project697.html
It was good and I definitely noticed more power.
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