The Honda 610cc GX Series OHV V-Twin Horizontal commercial-grade engine incorporates proven Honda engine technology and design innovations to make it the most advanced power source available for OEM and replacement use. Overhead Valve design gives more power from a smaller package, runs cooler and lowers fuel consumption as compared to conventional side-valve engines. Cast iron cylinder sleeve provides longer service life. V-Twin offers powerful performance and meets EPA and CARB emission level standards. Common applications include lawn tractors, mowers, utility vehicles, concrete saws, pressure washers, chippers/shredders, trenchers, generators, vibratory rollers and ride-on cement trowels. Displacement (cc): 670, Shaft Dimensions Diameter x L (in.): 1 1/8 x 3.54, Application: Lawn tractors, mowers,utility vehicles, Torque (ft./lbs.): 33.9, Shaft Output: Horizontal, Engine Type: GX OHV, Start Type: Electric, Mounting Base L x W (in.): 7.69 x 3.39 to 4.65, Bolt Circle (in.): 5, 6.5, 7.75, Shaft Keyway (in.): 1/4, Shaft End Tapped (in.): 7/16-20, Max. RPM: 3,600, Charging System Amps: 20, Ignition System: Transistorized magneto, Oil Capacity (qt.): 2.01, Air Cleaner Type: Dual element, Low Oil Alert: No, Lubrication System: Full pressure, Compression Ratio: 8.3:1, Bore x Stroke (in.): 3.0 x 2.8, Cylinder Bore: Cast iron, Flywheel Brake: No, Auto Compression Release: Yes, Dimensions L x W x H (in.): 16.2 x 18.94 x 18.21, EPA/CARB Approval (California Air Resource Board): Yes Honda 670cc GX OHV V-Twin air-cooled, 4-stroke, 90 degrees, horizontal engine Displacement: 670cc (40.9 cu. in.) 12V, 20 Amp charge coil Auto compression release Spin on oil filter Low noise and vibration Remote access control Fuel pump Fuel tank and muffler not included