1989 RM 250 mid range problem

Joined
Jun 18, 2007
Messages
2
Likes
0
#1
When I am in 1st and 2nd gear I have no mid range throttle. I have messed with the jetting and I either run too rich or too lean. I am getting really frustrated. I am thinking it might be dirty exhaust valves. Does anyone have any idea what it could be?