100mm Bore +25 +50 +75 +100 Motorcycle Piston Ring For Yamaha Raptor 660R Tenere 660 YXR660FA Rhino 660 04-06 Fit For Yamaha Raptor 660R Tenere 660 YXR660FA Rhino 660 2004 2005 2006 ATVs offers oversize specs +25 +50 +75 +100 with standard 100mm bore size sized ring notches align cylinder inner walls fits cylinder barrels without extra grinding or Tight sealing structure stabilizes engine compression reduces oil consumption during offroad heavy load operation material processed with tempering treatment smooth ring surfaces cut cylinder wall abrasion Uniform ring thickness calibrated 100mm inner diameter sustain steady engine after long working hours