"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. Bolt Circle in. 7 3/4, Ignition System Digital CDI, Shaft Rotation From PTO Shaft Side Counterclockwise, Governor System Mechanical, EPA/CARB Approval California Air Resource Board Yes, Oil Capacity qt. 2.3, Shaft Diameter in. 1, Cylinders qty. 2, Engine Displacement cc 630, Bore x Stroke in. 3.1 x 2.8, Lubrication System Full pressure, Torque ft./lbs. 35.2, Shaft Length in. 3.11, Carburetor 2-barrel, fuel cut solenoid, inner vent, Compression Ratio 9.3 1, Start Type Electric, Engine Type Air cooled, Air Cleaner Type Dual element. Full pressure lubrication system Forged steel connecting rod Mechanical governor system 50-state compliant engine"
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