Hello I have a 1991 Fantic 309 which had the throttle stuck open during a crash, when i finaly got it to stop it wouldnt start again. After many hours of trying i deceided to take it to bits and find out what was wrong, I found that it had snapped a piston ring, scrapped the cylinder and wrecked the piston. I had the barrel re-bored and plated and purchased a replacement piston.
After re-building the engine and fitting it back into the bike it was finaly time to see if it would run, To my supprise it did second kick and away we went, But !!!!! it runs like a three legged dog. It wont idle correctly picking up revs on its own untill you have to switch it off. won't settle after opening the throttle.
Does this sound like an air leak iv purchased a new gasket kit and crank seal set but just wonderd if anybody had any advice on what to change first before i started to strip down the engine for a second time.
Thanks for any advice givern.
Russ.