I have a gx200 with 70mm wiseco piston,f275 cam,1.2 rollers, big valve head,12.5 compression, race gas,28mm mikuni, I dont know where my peak torque is on my motor do I have to get it dyno to find it I put the motor together, motor runs great now.does anybody have this set up and might be able to get me close. I have the adult stock red spring set at 4000 now, I just dont wont to burn up a new nice clutch. Its on a mini bike.