Piston Std / Briggs & Stratton 793214Pack Size:1Briggs & Stratton 298904, Briggs & Stratton 393819, Briggs & Stratton 793214, Briggs & Stratton 791880ESF 163-090, Foley/Belsaw 5976211, Foley/PLP 163-090, Green Meadow PO90, Laser L5631, Laser 94221, NHC 266-8774, Oregon 36-300, Prime Line 7-03507, Prime Line 7-03805, Rotary 2721, Rotary 1721, Sunbelt SB-2721, Sunbelt SB-2722, Sunbelt B1SB2721Briggs & Stratton 90100-92900, 93500, 93900, 94500-96500, 98900, 10A900 and 130200-130900Ethanol: Not compatible with greater than 10% ethanol fuel, Cylinder Bore Size: 2.5615"-2.5625"