1993-2008 Honda TRX 300 EX ATV Engine Piston Ring Kit [Bore Size (mm): 73.95] 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: 1993-2008 Honda TRX 300 EX