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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RTAF
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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RTAF

Item# 109864
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Only $1599.99

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

Repair Plan — 1 Year
Only $129.99
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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 grain augers/elevators, pressure washers and semi-trailers with a power pack.

What's Included

  • (1) Engine, Model# GX690RTAF

Features + Benefits

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  • With control box
  • Fuel tank and muffler not included
  • 50-state compliant engine

Key Specs

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Item#109864
Ship Weight110.0 lbs
Engine Displacement (cc)688
Start TypeElectric
ApplicationGrain augers/elevators, pressure washers and semi-trailers w/a power pack
Engine TypeGX series OHV V-Twin
Rated Power (HP)22.3 net
Torque (ft./lbs.)35.6 ft.-lbs.
Shaft OutputHorizontal
CrankshaftT type
Shaft Diameter (in.)1 1/8
Shaft Length (in.)3.55
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
Bearing TypeBall bearing
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
Fuel TankNo
Fuel TypeGas
Fuel PumpBoost type
Oil Capacity (qt.)2
Lubrication SystemFull pressure
Low Oil AlertYes
Low Oil ShutdownNo
Ignition SystemElectrical, digital CDI w/variable ignition timing
Governor SystemMechanical
Carburetor(2) Barrel, fuel cut solenoid, inner vent
Throttle ControlManual
Choke ControlManual
Max. RPM3,600
Charging System Amps20
Muffler IncludedNo
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.)16 x 18 x 18
EPA/CARB Approval (California Air Resource Board)Yes

Additional Information

Dimensions and 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 $129.99
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Only $229.99
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Repair Plan with Accidental Damage
Only $199.99
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Only $299.99
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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RTAF The price is $1,599.99.
Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RTAF
(Not Yet Rated - New)
Item# 109864
In Stock Online
Only $1599.99
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, mower, utility vehicle, 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