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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQYF
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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQYF

Item# 166132
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Only $1199.99

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Manufacturer's Warranty: 3 year limited warranty

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Product Summary

With experience born on the raceways and roadways and a dedication to innovation, there's plenty of reasons to insist on the new Honda GX630 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.

What's Included

  • (1) Engine, Model# GX630RHQYF

Features + Benefits

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  • 688cc air-cooled, 4-stroke OHV engine
  • 50-state compliant engine

Key Specs

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Item#166132
Ship Weight110.0 lbs
Engine Displacement (cc)688
Start TypeElectric, shift type
ApplicationLawn tractor, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel
Engine TypeGX series OHV V-Twin commercial-duty
Rated Power (HP)20.3
Torque (ft./lbs.)35.2
Shaft OutputHorizontal
CrankshaftQ-type
Shaft Diameter (in.)1
Shaft Length (in.)2 29/32
Shaft Keyway (in.)1/4, (Key size 6.3mm x 50mm)
Shaft End Tapped (Diameter (in.)/Threads per inch)3/8–24, UNF2B
Shaft Rotation (From PTO Shaft Side)Counterclockwise
PTO Height (in.)5 1/4
Cylinders (qty.)2
Cylinder BoreIntegrated
Bore x Stroke (in.)3.1 x 2.8
Compression Ratio9.3:1
Cooling SystemAir cooled
Air Cleaner TypeDual element/Cylindrical
Fuel TankNot included
Fuel TypeGasoline
Fuel PumpBoost type
Oil Capacity (qt.)2
Lubrication SystemFull pressure
Low Oil AlertYes
Ignition SystemElectonic, Digital CDI w/variable ignition timing
Governor SystemMechanical
Carburetor2-barrel, fuel cut solenoid, inner vent
Throttle ControlRemote (wire)
Choke ControlRemote (wire)
Max. RPM3,600
Charging System Amps20
Muffler IncludedNot included
Flywheel BrakeNo
Bolt Circle (in.)5, 6 1/2, 7 3/4
Mounting Base L x W (in.)7 11/16 x 3 25/64 to 4 21/32
Dimensions L x W x H (in.)15 7/8 x 16 1/8 x 17 3/16
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Dimension + Performance Curve

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Mufflers

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
3 year limited warranty

Protect your purchase beyond the manufacturer's warranty
with Service Protection Plus!

DESCRIPTION (Click More Info for details) 1 Year Extension 2 Year Extension
Repair Plan
Only $99.99
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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQYF The price is $1,199.99.
Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQYF
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Hide Similarities
Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric, shift type Electric, shift type Electric, shift type Electric, shift type Electric
Application Lawn tractor, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Lawn tractor, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Grain augers/elevators, pressure washers, semi-trailer w/power pack Grain augers/elevators, pressure washers and semi-trailers w/a power pack
Engine Type GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty GX series OHV V-Twin
Rated Power (HP)
20.3 20.3 20.3 21 22.3 net
Torque (ft./lbs.)
35.2 35.2 35.6 at 2,500 RPM 35.2 35.6 ft.-lbs.
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft Q-type Q-type Q-type T type T type
Shaft Diameter (in.) 1 1 1 1 1/8 1 1/8
Shaft Length (in.) 2 29/32 2 29/32 2 29/32 3 31/32 3.55
Shaft Keyway (in.)
1/4, (Key size 6.3mm x 50mm) 1/4, (Key size 6.3mm x 50mm) 1/4, (Key size 6.3mm x 50mm) 1/4, (Key size 6.3mm x 70mm) 1/4 (Key size 6.3mm x 70mm)
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24, UNF2B 3/8–24, UNF2B 3/8–24, UNF2B 7/16–20, UNF2B 7/16–20, UNF2B
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.) 5 1/4 5 1/4 5 1/4 5 1/4 -
Bearing Type
- - - - Ball bearing
Cylinders (qty.)
2 2 2 2 2
Cylinder Bore
Integrated Integrated Integrated Integrated Integrated
Bore x Stroke (in.)
3.1 x 2.8 3.1 x 2.8 3.1 x 2.8 3.1 x 2.8 3.1 x 2.8
Compression Ratio
9.3:1 9.3:1 9.3:1 9.3:1 9.3:1
Cooling System
Air cooled Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Dual element/Cylindrical Dual element/Cylindrical Dual element/Cylindrical Dual element/Cylindrical Dual element
Fuel Tank Not included Not included Not included Not included No
Fuel Type Gasoline Gasoline Gasoline Gasoline Gas
Fuel Pump
Boost type Boost type Boost type Boost type Boost type
Oil Capacity (qt.)
2 2 2 2 2
Lubrication System
Full pressure Full pressure Full pressure Full pressure Full pressure
Low Oil Alert
- Yes Yes Yes Yes
Low Oil Shutdown
- - - - No
Ignition System
Electonic, Digital CDI w/variable ignition timing Electonic, Digital CDI w/variable ignition timing Electonic, Digital CDI w/variable ignition timing Electonic, Digital CDI w/variable ignition timing Electrical, digital CDI w/variable ignition timing
Governor System
Mechanical Mechanical Mechanical Mechanical Mechanical
Carburetor
2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent 2-barrel, fuel cut solenoid, inner vent (2) Barrel, fuel cut solenoid, inner vent
Throttle Control
Remote (wire) Remote (wire) Manual Manual Manual
Choke Control
Remote (wire) Remote (wire) Manual Manual Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 20 20 17 20 20
Muffler Included
Not included Not included Not included Not included No
Flywheel Brake
No No No No No
Bolt Circle (in.)
5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4 5, 6 1/2, 7 3/4
Mounting Base L x W (in.)
7 11/16 x 3 25/64 to 4 21/32 7 11/16 x 3 25/64 to 4 21/32 7 11/16 x 3 25/64 to 4 21/32 7 11/16 x 3 25/64 to 4 21/32 7 11/16 x 3 25/64 to 4 21/32
Dimensions L x W x H (in.)
15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16 15 7/8 x 16 1/8 x 17 3/16 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes