pollyp
its just a gesse (danm brain cells are dieing by the second), we,ve had this problem with the kart engines, the compression rings have a lot more "spring" than the oil control rings, so when you,ve got a bit of bore wear the oil rings are barely touching the bore, so the compression is ok but they still drink oil !
we never had this problem with the old 1 piece oil rings coz they were as springy as the compression rings, but the 3 peice ones are really weak !
the only way we got round it was to fit o/s rings and file the ends to a 10 thou gap !
