DaveswMN

GM, didn't see your last post about the bent valve until after I asked about it. The original cylinder gasket had the open spaces on three of the holes and included an o-ring. There is no seat for the o-ring on the cylinder I bought and the gasket I bought does not have the open spaces on the gasket. Is this ok?

I'm suspecting now that a valve is bent. If when I originally turned the engine over and it fired for about 4-6 times I heard something. If the chain was riding on one side of the chain and when it fell off the sproket could the valve have hit the piston and got bent? GM, didn't see your last post about the bent valve until after I asked about it.

Pulled the cover,stator and fly wheel and found the chain off the sproket. Replaced, timed turned by hand. doesn't seem to have much compression. spun it with the starter and did not start. Checked the tappet gap and found them to be off from what I had set originally. Haven't been back at it but seems like I might run out of threads when I get back to adjusting the intake valve. Both vales seemed to be operating ok by looking thru spark plug hole. Hope to get back at it in a few days.

Pulled my '86 Moto4 out of shed where it sat for 20 years. I knew it smoked. checked it over a little put in gas and it fired right up!! Drove about 100 yards, ran about half throttle wouldn't idle. Put on somenew parts, jug/piston and rings, carb and valve seals. 'went together ok, tuned it over by hand about 6 revs whick went well. Hit the starter it fired for about 6 revs and quit. tried it again fired once and then th sound of something slipping like maybe chain slipping over spoket. Took cover off to watch cam sproket, hit starter again, heard same noise and the cam sproket was not turning but jumping a bit. Chain was still tight. You will probably tell me I need to split the lower case but hoping there mightbe something else. I don't fully understand the chain tightener, the plunger only moves about 1/4 inch, should it move much more than that when off the motor and compressing it by hand? Thanks for any thoughts.