it just keeps getting better. i put everything back together, with the piston all fixed up, and it help quite a bit. still four-strokes though, but not nearly as bad. kind of comes in pulses. but it has a lot more power. i think its a compression issue, so tomorrow ill check the compression and see if im getting lots of blow-by. there were blow-by marks at the ring gaps, perhaps time for new rings? is 120 a good litmus test for hobbits?