Bore 100mm Motorcycle Cylinder Piston Ring For Yamaha YFM660 Raptor XTZ660 Tenere YXR660FA Rhino SZR660 Fit For Yamaha YFM660 Raptor 660R XTZ660 Tenere 660 YXR660FA Rhino 660 SZR660 motorcycles ATVs full piston ring kit with 100mm standard bore size manufactured compression rings oil control rings match 100mm cylinder bore to restore stable engine compression eliminate excessive oil burning hardness material withstands operating temperature friction during heavy load offroad farm work accurate ring gap clearance prevents carbon deposit buildup inside cylinders to piston cylinder wall from abrasion complete matched ring combination balances engine lubrication reduces wear of internal crankshaft components