Briggs and Stratton 83152-1049-F1 550 Series 127cc Engine with 6:1 Gear Reduction 50-state compliant engine 6:1 Gear reduction CCW rotation, Gear Shaft, 3/4-Inch Dia, Keyway Excellent performer for mid-duty applications Buyer protection package provides two-year consumer warranty Gear reduction at 9 o'clock position