Still not "happy" with it. Hope to be in serious Mac mode here in a few days with a dedicated Mac bench (apart from my other work area) to first replace the piston in Kevin's 7-10, followed then by revisiting the SP81. If I can't derive any more joy from the existing points ignition, I intend to chip it just for comparison if nothing else.
My point in mentioning it is that it's already essentially the 82cc 10-10 you guys are conceptualizing, just with nubbers and isolators..., when if bad, are gonna provide a pretty bumpy cutting experience similar to any other of the hard tails. If you want an 82cc 10-10 hard tail, just replace the nubbers with metal bushings on an SP80/81 and there ya go! LOL