Asked in Yamaha Motorcycles
We have an old Yamaha champ dirt bike and we overhauled it when we start it it idles fine but when we try to rev it up it wont rev at all what can we do to fix this?
First, get the engine running and fully warm. If the bike has a center stand, keep it on the center stand so that the rear tire is not touching the ground. With no ground resistance, try revving the engine. If the engine dies or does not respond to throttle movement, you could have a bad variator (CVT) or possibly a faulty throttle cable. It could also be a clogged orifice in the carburetor.
Check the brake adjustment to the rear wheel. It may be that the adjustment is too tight, and the rear wheel will not spin freely.