restricting a mini motard while running it in

is it possible to restrict the engine until it is run in

yes it is get a govorner depending on what model bike u have all are different it could be a screw in the throttle body or it could be a peice of metal shaped like a horse shoe as u want more speed u cut the metal down untill its fully removed

at mid south they sell exhaust plates that restrict your engine but i dont know if it will fit your bike or not