base timing keeps advancing by itself...

@smokinnjokin Change the step up spring for a lighter color one!! Blue, 'yellow,silver, orange,pink'
Yeah...confusing, got it.
You want full jet or more jet sooner.
Heres the thing..
Lean enough to detonate...would mean youre past exhibiting any mild surge. So.. how would your motor go from bitchin...to detonation in one season. Change of fuel blend perhaps. How rough was the bore finish? Got any oil deposits?

I'd expect ,if any change.. it would be mostly noticeable by the performance and plug reading..not detonation. Like one jet change maybe.

What's the cranking compression with one plug out and carb held at wot?
What's the distributor cap look like inside?
Show us the plug, up close, focused right after it's been detonating.




Man...4 pages later and he finally checked his tdc.

party time!