Fits Models: Gravely K301 (before serial #1730100013) and M12 (old style)Kohler K301 (before serial #1730100013) and M12 (old style)
Specifications: Piston Size: 0.02 Piston Size + .020 Ethanol Not compatible with greater than 10% ethanol fuelCylinder Bore Size: 3.395"
Additional Information: Use with 500-389 Piston Rings +.020 500-389 Piston Rings +.020
