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wrote:

I take it, your talking abotu a spark "ping" or "knock" .

does it run good at wide open throttle? and does it idle well? I'm
sure you're running fresh gas in it. Old fuel will cause spark knock,
but will usually run crappy regardless of RPM, that is, if you can get
it started. You might also consider having the spark timing checked to
see if it hasn't slipped.

I don't think you have a stator problem, that is, unless the battery is
draining and isn't being charged.

The engine seems to be fine at WOT and also idles OK, it has fresh fuel
and has had about 15 gallons through it this season. Although it was
reluctant to fire this last trip out from cold, but after that started
OK each time. I need a workshop manual off e bay really I know, but I
was hoping there may be a common failing on a component on this engine.
Thanks for the reply BTW.