You have to remember atv's arnt really designed for use on the road/pavement ... Also its not good for the motor to keep the throttle pinned while in 6th gear at or near top speed, the crank case can starve for trans oil therefore not getting adequate lubrication. Never hold it at wot for more then 10 seconds without letting off for at least 3 seconds, this allows the proper amount of trans oil to reenter the upper part of the crank case and lubricate the crank/bearings etc.