Well, I don't think I have a dial back light. Isn't that what I would need to see the timing mark at 15 degrees advanced?

I think something is wrong with the timing or carb. This thing hates idling low. It is factory 2 bbl and probably needs rebuilt. I have sprayed it with gumout while running and did not notice a change in speed, so I don't think it has leaks anywhere, I think it is gummed up.

I will probably rebuild it this weekend. I don't know anything about the engine, for all I know the timing chain could be off. It is runnign rough.