Piston Std / Kohler 47 874 11-SPack Size:1Kohler 47 874 11, Kohler 47 074 06, Kohler A-237401, Kohler 47 874 11-SESF 163-364, Foley/Belsaw 5979374, Foley/PLP 163-364, Green Meadow P364, Laser 94233, NHC 266-8316, Prime Line 7-03819, Ratio Parts 14-114, Rotary 6753, Sunbelt SB-6753Kohler K321 and M14 (old style)Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 3.500"