1998-2004 Honda TRX450 S/ES/FE/FM Foreman ATV Engine Piston Ring Kit [Bore Size (mm): 89.96 (Stock)] Bore Size (mm): 89.96 Ring Kits Include Piston Rings Only - Piston Not Included Namura Piston Rings Fit Both Namura and OEM Pistons of the Same Bore Size Unless Otherwise Specified Compatibility: 1998-2004 Honda TRX450 S/ES/FE/FM Foreman