Most of you are firmiliar with my quad and what i have done for those who dont I put a new crank in it. Now i have a question. The guy i baught it off of a.k.a. my brother now admits that he had the whole motor tore apart as far as i did and he lets just say had a couple extra pieces when he was done. One was a washer that the only place i can think of judging by the size could be off the balance for the crank. I think it was supposed to be on the inside of the 2 halves between the balancer and the bearing, and im starting to wonder if the sound im hearing isnt the valves and could be that. When i checked it when i put in back togeather it only moved like a milimeter at most. Could that little movement be making what i think sounds like valves? Is there any way i can diferenciate(spell check) between the top end making the noise and the bottom end. Any help is apreciated.