netsurfer, that's some good info, I wish I would have had that when I was messing with mine. One of my flywheels had two key slots in it, so you could alter the timing just by moving the flywheel on the crankshaft. But with all of my swapping of parts, that flywheel may not have been compatible with the coil I was using. (even though it had two positions) I don't think I ever used a different flywheel because I spent time machining one of them, so thats they one I always messed with. I did swap coils, but I don't think I tried all combinations, so that could have been my problem. I finally gave up on it, (them) since the Honda 4 stroke had me so intrigued.