"With experience born on the raceways and roadways and a dedication to innovation, there's plenty of reasons to insist on the new Honda GX660 V-Twin engine. There's superior engine design, with a 90 configuration that reduces vibration and allows a compact footprint. There's superior construction, with a forged steel crankshaft and an integrated cylinder head. Fewer parts means better durability. There's a digital CDI ignition coil that ensures improved fuel economy and lowered emissions. There's even improved air cleaning, meaning that you can wait 5 times longer between filter changes. Honda even gives their engines a 3-year limited warranty. The image shown is not reflective of the actual item shipped. There is no control panel as shown in the image. Engine Displacement cc 688, Ignition System Electonic, Digital CDI w/variable ignition timing, Cylinders qty. 2, Charging System Amps 20, Dimensions L x W x H in. 15 7/8 x 16 1/8 x 17 3/16, Max. RPM 3,600, Throttle Control Remote wire, Governor System Mechanical, Engine Type GX series OHV V-Twin commercial-duty, Compression Ratio 9.31, Air Cleaner Type Dual element/Cylindrical, Start Type Electric, shift type, Choke Control Remote wire, Fuel Tank Not included, Fuel Type Gasoline, EPA/CARB Approval California Air Resource Board Yes, Oil Capacity qt. 2, Application Lawn tractor, mower, utility vehicle, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel, Bore x Stroke in. 3.1 x 2.8, Shaft Keyway in. 1/4, Key size 6.3mm x 70mm, Cylinder Bore Integrated, PTO Height in. 5 1/4, Torque ft./lbs. 35.2, Carburetor 2-barrel, fuel cut solenoid, inner vent, Crankshaft T type, Fuel Pump Boost type, Shaft Output Horizontal, Shaft Rotation From PTO Shaft Side Counterclockwise, Shaft Diameter in. 1 1/8, Shaft Length in. 3.55, Shaft End Tapped Diameter in./Threads per inch 7/16-20, UNF2B, Flywheel Brake No, Lubrication System Full pressure, Bolt Circle in. 5, 6 1/2, 7 3/4, Rated Power HP 21, Cooling System Air cooled, Mounting Base L x W in. 7 11/16 x 3 25/64 to 4 21/32, Muffler Included Not included. 688cc air-cooled, 4-stroke OHV engine 50-state compliant engine"
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