@Gordon Nichols posted:If I was running over 10:1 comp. I might have other news to tell, but hey.... These are lawn mower engines, after all.
Yeah, but they're FANCY lawn-mower engines, see?
The twin-plug motor was running 10.6:1, and had the cam advanced 3*. It ran phenomenally, but tailoring the ignition curve was very, very important. When I redo the engine, the cam will be straight up, and it'll have some sort of crank pickup trigger.
That motor needed E10 93/91. I had a "bad gas" program saved for the black-box, if I ever needed it.