Im at my wits end with this 90 i've been working on. I started off with it and got it running by cleaning the carb out. It started everytime on the first pull but smoked alot. I pulled the head and cylinder off and put on a new set of rings. After I put it back together I have not been able to get it running. I have about 120 lbs of compression and this is with the engine cold. I have a fat blue spark, and i am getting fuel. I even have tried taking the carb off and just spraying a little starting fluid in the intake. It pops but not much. My valve timing is definitely good and the ignition timing should be set good enough to get it to start.
I had a friend take a look and the only thing he noticed after we spent about 3 or 4 hours on it was that the cam chain seemed to have a little slack in it. He said it's possible that the chain is stretched (which seems a little odd to me being that it ran before I replaced the rings) The only thing I am wondering is when I tighten the cam chain tensioner it doesn't seem to make any difference no matter how loose or how tight i make it.
Is it possible that the little wheel on the tensioner fell off or something like that? Any other ideas? I've put alot of time into this thing and all i originally set out to do was replace the rings.
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