This is something that happened last summer.
My brother and I just got back from a decent ride, and we got to my house and my brothers engine was revving really high and would not shut off, so we pulled the spark plug wire and it still ran!
It ran as fast as it could.
He had to clutch kill it.
My theory is that since he installed the SBP expansion chamber and despite trying different jets on an RT carb he just installed as well, he was still running a bit too lean and inside his cylinder got so hot that is was self combusting. It wouldn't take much fuel (throttle was in idle position) to make an engine do this so long as there is an abundance of air in the cylinder mix?
Good theory?
Or air leak?
I would sure like some decent imput on this as the bike was just put away because we never got to fixing it and will be brought out in spring.
My brother and I just got back from a decent ride, and we got to my house and my brothers engine was revving really high and would not shut off, so we pulled the spark plug wire and it still ran!
It ran as fast as it could.
He had to clutch kill it.
My theory is that since he installed the SBP expansion chamber and despite trying different jets on an RT carb he just installed as well, he was still running a bit too lean and inside his cylinder got so hot that is was self combusting. It wouldn't take much fuel (throttle was in idle position) to make an engine do this so long as there is an abundance of air in the cylinder mix?
Good theory?
Or air leak?
I would sure like some decent imput on this as the bike was just put away because we never got to fixing it and will be brought out in spring.