1988-2000 Honda TRX300/Fourtrax/FW ATV Engine Piston Ring Kit [Bore Size (mm): 73.95 (Stock)] Bore Size (mm): 73.95 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: 1988-2000 Honda TRX300/Fourtrax/FW