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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQWF2

Item# 59372
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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQWF2

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Only $1329.99
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  • 688cc air-cooled, 4-stroke OHV engine
  • 90° configuration reduces vibration and allows a compact footprint
  • Superior construction, with a forged steel crankshaft and an integrated cylinder head
  • Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • Remote rod throttle and choke setup
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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 Horizontal OHV Engine with electric start. There's superior engine design that's ideal for a variety of applications including: concrete saws, pressure washers, chippers/shredders, trenchers, vibratory rollers, and ride-on cement trowels. Fewer parts means better durability. Honda even gives their engines a 3-year limited warranty.

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What's Included
  • (1) Engine, Model# GX630RHQWF2

Features + Benefits

  • 688cc air-cooled, 4-stroke OHV engine
  • 90° configuration reduces vibration and allows a compact footprint
  • Superior construction, with a forged steel crankshaft and an integrated cylinder head
  • Digital CDI ignition coil ensures improved fuel economy and lowered emissions
  • Remote rod throttle and choke setup
  • Improved air cleaning allows you to wait 5 times longer between filter changes
  • 50-state compliant engine
Key Specs
Item# 59372
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 110.0 lbs
Engine Displacement (cc) 688
Start Type Electric
Application Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel
Engine Type GX series OHV V-Twin commercial-duty horizontal
Net Power Output (HP) 20.8 (15.5 kW) at 3,600 RPM
Net Torque (lbs./ft.) 35.6 (48.3 Nm) at 2,500 RPM
Shaft Output Horizontal
Crankshaft Q-type horizontal
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
Gear Reduction No
PTO Height (in.) 5 1/4
Bearing Type Ball bearing
Cylinders (qty.) 2
Cylinder Bore Integrated
Bore x Stroke (in.) 3.1 x 2.8
Compression Ratio 9.3:1
Cooling System Air cooled
Air Cleaner Type Dual element/cylindrical
Fuel Type Gasoline
Fuel Pump Boost type
Fuel Filter Yes, fuel strainer
Oil Capacity (qt.) 2
Lubrication System Full pressure
Low Oil Alert Oil pressure indicator
Low Oil Shutdown Yes
Ignition System Electronic, digital CDI with variable ignition timing
Governor System Mechanical
Carburetor 2-barrel, fuel cut solenoid, inner vent
Throttle Control Remote rod
Choke Control Remote rod
Max. RPM 3,600
Charging System Amps 17
Muffler Included No
Flywheel Brake No
Auto Compression Release Yes
Bolt Circle (in.) 5, 6 1/2, 7 3/4
Mounting Base L x W (in.) 7 11/16 x 3 25/64 x 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
Product Weight (lbs.) 110

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Replacement Parts
Call To Order: 1-800-657-0516

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Sat 7:00 AM - 3:00 PM (Central)

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Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQWF2 The price is $1,329.99.
Honda V-Twin Horizontal OHV Engine with Electric Start – 688cc, GX Series, 1in. x 2 29/32in. Shaft, Model# GX630RHQWF2
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Only $1329.99
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Hide Similarities
Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric start Electric Electric, shift type Electric Electric
Application 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 Lawn tractor, mower, utility vehicle, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Pressure washer, lawn/garden equipment, generator, small vehicle, water pump Grain auger/elevator, pressure washer, semi-trailer w/power pack
Engine Type GX series OHV V-Twin commercial-duty GX series OHV V-Twin commercial-duty horizontal GX series OHV V-Twin commercial-duty GX series OHV V-Twin GX series OHV V-Twin
Net Power Output (HP) 20.8 (15.5 kW) at 3,600 RPM 20.8 (15.5 kW) at 3,600 RPM 21.5 (16.0 kW) at 3,600 RPM 22.1 (16.5 kW) at 3,600 RPM 22.1 (16.5 kW) at 3,600 RPM
Net Torque (lbs./ft.) 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM 35.6 (48.3 Nm) at 2,500 RPM
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft Q-type Q-type horizontal T type T type T type
Shaft Diameter (in.) 1 1 1 1/8 1 1/8 1 1/8
Shaft Length (in.) 2 29/32 2 29/32 3.55 2 29/32 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 70mm) 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 7/16–20, UNF2B 7/16–20, UNF2B 7/16–20, UNF2B
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
Gear Reduction - No - - -
PTO Height (in.) 5 1/4 5 1/4 5 1/4 5 1/4 -
Bearing Type
- Ball bearing - Ball bearing 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 78 x 72 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 Dual element
Fuel Tank Not included - Not included No No
Fuel Type Gasoline Gasoline Gasoline Gas Gas
Fuel Pump
Boost type Boost type Boost type Boost type Boost type
Fuel Filter - Yes, fuel strainer - Fuel strainer -
Oil Capacity (qt.)
2 2 2 2.1 2
Lubrication System
Full pressure Full pressure Full pressure Forced lubrication Full pressure
Low Oil Alert
Yes Oil pressure indicator - No Yes
Low Oil Shutdown
- Yes - No No
Ignition System
Electonic, digital CDI w/variable ignition timing Electronic, digital CDI with variable ignition timing Electonic, digital CDI w/variable ignition timing Electrical, 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 Horizontal, two-barrel butterfly valve, internal vent (2) Barrel, fuel cut solenoid, inner vent
Throttle Control
Manual Remote rod Remote (wire) Remote Manual
Choke Control
Manual Remote rod Remote (wire) Remote Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 2.7 17 20 20 20
Muffler Included
Not included No Not included No No
Flywheel Brake
No No No No No
Auto Compression Release - Yes - Yes -
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 25/64–4 21/32 7 11/16 x 3 25/64 x 4 21/32 7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 21/32 7 11/16 x 3 25/64–4 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 9/10 x 16 1/10 x 17 1/5 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes
Product Weight (lbs.) - 110 - - -