Just put predator 212 in neighbors bike. Stock 212 besides an air filter adapter and a 95 jet. Today was fire up.day. Got running and it's surging at full throttle you can see govonor arm opening and closing the butterfly. Engine rpm is 3860 to 3720 ish when it surges. He doesn't want to bypass govonor if possible he has a kid that rides it occasionally. How do we prevent the surging? I'm out of ideas