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Honda 688cc GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 2 29/32in. Shaft, Model# GX690RHTDW
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Honda 688cc GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 2 29/32in. Shaft, Model# GX690RHTDW

Item# 13597

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Ships Truck 110.0 lbs
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Manufacturer's Warranty: 3 year limited warranty

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Product Summary

The Honda 688cc GX Series V-Twin Engine is designed to offer higher horsepower, improved adaptability, quiet operation and greater fuel economy. Meets EPA and CARB emission levels standards. This engine is ideal for construction/industrial equipment, pressure washers, commercial lawn and garden equipment, tillers/cultivators, generators, ag equipment, small vehicles, water pumps and forestry equipment.

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# GX690RTDW

Features + Benefits

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  • No control box
  • Fuel tank and muffler not included
  • 50-state compliant engine

Key Specs

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Item#13597
Ship Weight110.0 lbs
Engine Displacement (cc)688
Start TypeElectric
ApplicationConstruction/industrial/agricultural/forestry equipment, pressure washer, commercial lawn/garden equipment, tiller, cultivator, generator, small vehicle, water pump
Engine TypeGX series OHV V-Twin
Rated Power (HP)22.2 at 3,600 RPM
Torque (ft./lbs.)35.6 ft.-lbs. at 2,500 RPM
Shaft OutputHorizontal
CrankshaftT type
Shaft Diameter (in.)1 1/8
Shaft Length (in.)2 29/32
Shaft Keyway (in.)1/4 (Key size 6.3mm x 70mm)
Shaft End Tapped (Diameter (in.)/Threads per inch)7/16–20, UNF2B
Shaft Rotation (From PTO Shaft Side)Counterclockwise
PTO Height (in.)5 1/4
Bearing TypeBall bearing
Cylinders (qty.)2
Cylinder BoreIntegrated
Bore x Stroke (in.)78 x 72
Compression Ratio9.3:1
Cooling SystemAir cooled
Air Cleaner TypeDual element
Fuel TankNo
Fuel TypeGas
Fuel PumpBoost type
Fuel FilterFuel strainer
Oil Capacity (qt.)2.1
Lubrication SystemForced lubrication
Low Oil AlertNo
Low Oil ShutdownNo
Ignition SystemElectrical, digital CDI w/variable ignition timing
Governor SystemMechanical
CarburetorHorizontal, two-barrel butterfly valve, internal vent
Throttle ControlRemote
Choke ControlRemote
Max. RPM3,600
Charging System Amps20
Muffler IncludedNo
Flywheel BrakeNo
Auto Compression ReleaseYes
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.)15.9 x 16.1 x 17.2
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Dimensions and Performance Curve

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
3 year limited warranty

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with Service Protection Plus!

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Extended Warranty Repair Plan
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Honda 688cc GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 2 29/32in. Shaft, Model# GX690RHTDW The price is $1,499.99.
Honda 688cc GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 2 29/32in. Shaft, Model# GX690RHTDW
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Item# 13597
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Only $1499.99
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Item# 109864
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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 Electric
Application Concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Grain augers/elevators, pressure washers, semi-trailer w/power pack Lawn tractor, mower, utility vehicle, concrete saw, pressure washer, chipper/shredder, trencher, vibratory roller, ride-on cement trowel Construction/industrial/agricultural/forestry equipment, pressure washer, commercial lawn/garden equipment, tiller, cultivator, generator, small vehicle, water pump 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 GX series OHV V-Twin
Rated Power (HP)
20.3 21 21 22.2 at 3,600 RPM 22.3 net
Torque (ft./lbs.)
35.2 35.2 35.2 35.6 ft.-lbs. at 2,500 RPM 35.6 ft.-lbs.
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft Q-type T type T type T type T type
Shaft Diameter (in.) 1 1 1/8 1 1/8 1 1/8 1 1/8
Shaft Length (in.) 2 29/32 3 31/32 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 70mm) 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 7/16–20, UNF2B 7/16–20, 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 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 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 - - - 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 Yes - No Yes
Low Oil Shutdown
- - - No No
Ignition System
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 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 Manual Remote (wire) Remote Manual
Choke Control
Manual Manual Remote (wire) Remote Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps 3 20 20 20 20
Muffler Included
Not included Not included Not included No No
Flywheel Brake
No No No No No
Auto Compression Release - - - 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 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 15.9 x 16.1 x 17.2 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes