Alanvan69

How would the drive belt cause the engine to loose rpms? Its a 2001 scrambler 90 2 stroke. I would think it should rev to rev limiter and stay at that limit as long as throttle stays presses until it blows up if one would hold it wide open long enough. Can someone explain I guess I dont get this 2 stroke thing. Is it sorta like a chainsaw when the chain is pinched it wont rev?

If my son goes up a hill this things seems to bog down and wont rev up. If i power brake it its will spin the wheels and start to dig a trench then loses power for a second or 2 then regains it etc. I would think it would keep at the power band or maybe not. I took off the pipe and ran it straight for a few minutes to test exhaust and it behaved basically the same. On a flat or semi flat it will do almost 32 and hold there forever but again go to the bottom of a hill on a logging road and start out not reved up it just wont rev up at all can damm near walk as fast up the hill. What should I be checking for?