Ronnie,
Thanks for that tidbit. Sometimes I get brain-freeze trying to follow the firing & valve sequence in my head. I imaging people staring at me, wondering my I'm standing there, looking into space, mumbling to myself and making peculiar gestures with my hands . . .
Ya' know, I'm apt to think a two-cylce motor is a heck of a lot simpler!!! I think I'll go time my grass trimmer . . .
-Michael