Hi Testers,
Yes, I have done extensive testing on this engine now and the original CDI. I have also been working with the factory on resolving this and they are now going to do more testing because they are not having the same results as we all are having doing our tests. I think alot of the no-run issues all of you were having are 100% ignition related and nothing else. Also, the
bearings are an open design on these engines for a reason - less drag. A bearing with seals on both sides will decrease performance by adding surface drag. Nothing wrong with this seal design. Also, after testing the CDI with the factory and many discussions - it is correct that these ignitions are indexed at approximately 40 deg BTDC to provide auto-advance. This is contolled by the initial delay within the auto-advance circuit which will bring the advance back to a manageable level after the engine is started. This does work for running but it will make for difficult starting - it is one of the design points being discussed. The next point discussed is the determination of HV leakage within the CDI circuit itself - there is a fundamental transient HV problem that I cannot trace because the circuit components are potted and I cannot see them (although I can hear the spark internally). So, as of now the engine is running like a swiss watch on my test stand with an alternate ignition providing about 8580
rpm on a 16x8 Xoar.
Sincerely,
Jim
Western Hobbies