Quote Originally Posted by kur4o View Post
Why don`t you hit the local scrapeyard. There might be some cheap not working units. Anyway you only want the stock gm wheel.
New opti is almost impossible to find. Even GM sells only reman units now.

If we follow common sense you`re timing gear should be a little too tight. Since you hit alot of *5s at idle and stretched chain gives *7s.
Eleptical wheel will produce too many vibration when spun at high rpm.
You can compare chain link counts with crank sprocket tooth counts. If they have 2:1 ratio it is possible that half the chain is busted.
I have a stock 95 opti I can scan if you want when I get back home.

The gears have something like 15 and 30 teeth to give a 2:1 ratio but the chain is longer and the links should walk around so they don’t line up regularly.
Mitch