Rmx250

[monte]

HI guys

Just wondering if you could help
Have a 98 RMX250S (ADR model) and it goes great. some of the time.
50% of the time it will rev out nicely and pull hard on top
but the other half of the time it seems to rev out and be very flat as in not pulling like it should in the high rev range Recntly had power valve rebuilt and top end done. SO what could this be?? Jetting? Clutch slipping?? Any ideas would be great
Oh i also heard that the exhausts can clog up with carbon. Whats the best way to clean these? It has a standard exhaust with a pro circuit muffler

thanks

 

[billy madison]

if its revving hogh and not going then it needs a new clutch

 

[billy madison]

sorry i meant to spell high not hogh

 

[nickerbocker57]

have oyu checked the compression? my friends rm250 is doing the same thing cause he has a weak topend