Piston +.030 / Kohler 47 874 15-SPack Size:1Kohler 47 874 15, Kohler 47 074 25, Kohler A-237405, Kohler 47 874 15-SESF 163-367, Foley/Belsaw 5979736, Foley/PLP 163-367, Green Meadow P367, Prime Line 7-03822, Rotary 6756, Sunbelt SB-6756Kohler K321 and M14 (old style)Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 3.530"