Bore Size 71mm +100 Oversize Motorcycle Cylinder Piston Ring Gasket Kits Set For Honda AX-1 NX250 Engine Parts 71mm +100 oversize full overhaul kit compatible with Honda AX-1 NX250 1988 to 1993 overbore engine repair standard dimensions complete assembly includes piston piston rings matched gaskets to finish end rebuild without separate accessory purchases piston ring material stable compression reduces blowby oil consumption pressure gaskets eliminate coolant leakage at cylinder joint positions finished components fit seamlessly no grinding or needed for engine overhaul work