Motorcycle Engine Parts Piston Ring Kits Set For Honda CRM250 Bore Size 66mm Oversize +25 +75 +100 Fit For Honda CRM250 offroad motorcycle complete piston ring kits with 66mm base bore, available in +25, +75, +100 oversize specifications machined compression oil control rings match corresponding oversize cylinder bore to restore stable compression reduce abnormal oil consumption material endures temperature friction during long time trail riding, extending cylinder piston life accurate ring gap design effectively prevents carbon buildup inside cylinders avoids ring sticking failure oversize options meet different cylinder wear overhaul demands for one stop engine repair