Motorcycle Cylinder Engine Seal 70.25mm Oversize 1988-1993 Fit For Honda AX-1 NX250 1988-1993 70.25mm +25 oversize motorcycle cylinder piston ring gasket kits set +0.25 oversize piston ring assembly fits 70.25mm bore cylinder without extra grinding Complete matched cylinder, head base gaskets effectively oil leakage during offroad trail riding Hardened low-friction piston rings maintain stable compression reduce excessive oil consumption at RPM compressed gaskets keep tight sealing under long time temperature engine working status All-in-one integrated kit includes all necessary components to finish full top-end overhaul in single