Bore 70.5mm +50 Oversize Motorcycle Cylinder Piston Ring Gasket Kits Set For Honda AX-1 NX250 1988-1993 Engine Parts complete overhaul kit matched for Honda AX-1 NX250 1988 to 1993 with 70.5mm +50 overbore standard size integrated piston piston rings matched sealing gaskets to finish full top-end rebuild without separate part purchases wear-resistant piston rings restore stable cylinder compression reduce blowby oil consumption pressure-proof composite gaskets eliminate oil coolant leakage at cylinder joint surfaces finished components fit directly no grinding or extra machining needed for engine repair