The RPMs actually surge up/increase briefly when you are retarding the throttle? If so, just seems like something with the syncronization is off…
That is exactly why I suspected the timing is retarded. Spark must be at full advance before the carb butterflies kick full open or it will bog when they do open. Back the throttle off just a bit to “cruise” position, and the butterflies close down some and it takes off again.
feetwin and I are on the same page with our thinking.
Alan, you do have the breaker points set at 0.020″, don’t you.
