my preferred gap: loose end of spec. Then I don't have to do as many valves when i check the clearances
Overpasses
that's funny.
Okay, I'm going to think out loud here:
It gets funky when you're just at a constant throttle but a decent speed right? Any extra throttle cures this funk. Now, I know from playing with jetting that I could make a bike surge during constant throttle simply by lowering the needle a ton, but I'm not sure how to replicate that sound you're getting. Is it still making that funny sound consistently as well? You said the diaphragms are good, so that kinda rules out my sticky needles idea. I think I want to see how it does when you swap coils. While you're down there, double check all the wires you can see. It's possible something chewed them and they're shorting. But then, wouldn't that blow a fuse? and you've not mentioned any fuses, so that likely isn't it either.
Right now, I'm out of ideas.
