Re: rough running at high engine speeds

Posted by John Sauser On 2017/10/22 12:07:53

Have you checked to see if the mechanical advance is working?

Find someone with an old SUN dist. machine and have them test it. I find that when there is no mechanical advance the engine starts to give up at about 45-50 MPH.

A quick check is to watch the timing mark on the vibration damper with a timing lite while someone revs the engine, you should see the timing marks advance.

If you suspect a mechanical advance problem and can't find a SUN machine contact me as I have one, and am willing to help out.

Sincerely, John