Hello my brother has a Yamaha Blaster with a wiseco performance crank, rod and piston along with wiseco crank bearings. with a stock carb, all clean doesn't seem to be plugged anywhere, the problem is when he goes to push it past half throttle it basically looses its power, he has tons of power before half throttle, no matter what gear he is in it does this to him. id appreciate it if somebody could help us out, thanks!