XtremepowerUS 7HP Engine is offered with a 0.75in Horizontal Keyway Output Shaft, a Tapered Output Shaft (Generator Engine Replacement), Threaded Output Shaft (fits Water Pumps), and a 5/8" Threaded Output Shaft. Whether it's replacing your old log splitter or completing your go-kart build this Industrial Grade OHV Engine is EPA Certified, extremely quiet, and dependable. Features: It provides enough power to run a wide range of equipment, including log splitters, pressure washers, go-karts, and more Durable design runs quiy and provides smooth operation The operating fuel is standard 87 Octane or better Gasoline Provides industrial-grade strength to get the job done Specifications: Applications: Go-Karts, Pressure Washers, Trailer Mounted - Mobile Car-washes, Log Splitters, RotoTillers - Cultivators, Water/Trash Transfer Pump Fuel Type: Gasoline Engine Type: Industrial grade OHV gasoline engine Horse Power: 7 Engine Displacement (CC): 212 Max Power: 7HP @ 3600 RPM Gallon Per Hour: 14,260 Alternate Start System: E-Z Pull Recoil Starter Fuel Tank: 3.6L Oil System: Splash Reduction Type: None Engine Cooling Type: Forced Air Cooling Bore/Stroke: 70 X 55 Compression Ratio: 8:5:1 Shaft Type: Keyed - Straight Shaft Diameter: 3/4" Diameter, 3/16" Keyway Shaft Length: 2-5/8" Total, 2-5/16" Usable Shaft I.D. Thread Size: 5/16"-24 Drilled and Tapped Mount Type: Universal 4 bolt Patterns  Overall Dimensions: 12.5"(L) x 15"(W) x 14.25"(H) Package Contents: Shaft Gasoline Engine Manual *Note Add Motor Oil*