Piston +.020 / Kohler 47 874 09-SPack Size:1Gravely 040998, Kohler 47 874 09, Kohler 47 874 09-SESF 163-362, Foley/Belsaw 5979732, Foley/PLP 163-362, Green Meadow P362, Laser 94239, Prime Line 7-03817, Rotary 6751, Sunbelt SB-6751Gravely K301 (before serial #1730100013) and M12 (old style); Kohler K301 (before serial #1730100013) and M12 (old style)Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 3.395"