Motorcycle Cylinder Piston Ring For Yamaha XTZ660 Tenere 91-96 SZR660 YFM660 Grizzly Raptor 660R 100mm +25 Fit For Yamaha XTZ660 Tenere 1991 1992 1993 1994 1995 1996 SZR660 YFM660 Grizzly 660 YFM660R Raptor 660R adopts 100mm bore size with +25 oversize specification sized ring notches fit cylinder barrels directly no extra grinding or required Tight internal sealing stabilizes engine compression reduces oil consumption during heavy load offroad operation Made of tempered smooth ring surface lowers abrasion to cylinder inner walls Uniform ring thickness calibrated 100mm inner diameter sustain consistent engine over long working hours