Yes, the piston ring set is compatible with Continental TM20 gas engine. It's designed for the standard bore and should work fine as long as your cylinder walls are in good shape.
Yes, the Continental steel flex 858 STD 009 piston ring set works for the TM20 gas engine, check your engine's bore size and specs before buying to be sure
Hey, double-check that ring end gap after you put it in. The TM20's measurements need to be just right, or you could have issues like blow-by or scoring.