All the adjustments are made by the performance of the engine. If it runs well when you ride it, it is fine. If it is popping when you get of the gas or bogging when the throttle is stabbed or pinned on the top end (while riding, not sitting) then you need to adjust things. I would not touch it, just ride the piss out of it. Make sure it has fresh premium gas in it, clean oil in the motor, clean air filter and have fun.