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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RHTAF

Item# 109864
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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RHTAF

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Was $1499.99
Sale $1449.99

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

  • With control box
  • Fuel tank and muffler not included
  • 50-state compliant engine
Key Specs
Item# 109864
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 110.0 lbs
Engine Displacement (cc) 688
Start Type Electric
Application Grain auger/elevator, pressure washer, semi-trailer w/power pack
Engine Type GX series OHV V-Twin
Net Power Output (HP) 22.1 (16.5 kW) at 3,600 RPM
Net Torque (lbs./ft.) 35.6 (48.3 Nm) at 2,500 RPM
Shaft Output Horizontal
Crankshaft T 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 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
Fuel Tank No
Fuel Type Gas
Fuel Pump Boost type
Oil Capacity (qt.) 2
Lubrication System Full pressure
Low Oil Alert Yes
Low Oil Shutdown No
Ignition System Electrical, digital CDI w/variable ignition timing
Governor System Mechanical
Carburetor (2) Barrel, fuel cut solenoid, inner vent
Throttle Control Manual
Choke Control Manual
Max. RPM 3,600
Charging System Amps 20
Muffler Included No
Flywheel Brake No
Bolt Circle (in.) 5, 6 1/2, 7 3/4
Mounting Base L x W (in.) 7 11/16 x 3 25/64–4 21/32
Dimensions L x W x H (in.) 16 x 18 x 18
EPA/CARB Approval (California Air Resource Board) Yes

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Product Question + Answer
Accessories Frequently Purchased with this Item

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High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Right/Oil Filter Side Mount, Model# MUF-0560.SIL
Item# 601099
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
Was $139.99
Sale $124.99

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High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Left/Starter Side Mount, Model# MUF-0560R.SIL
High-Mount Muffler for Honda V-Twin Engines — Fits GX630, 660 and 690 Engines, Left/Starter Side Mount, Model# MUF-0560R.SIL
Item# 601105
Factory Shipped —
Estimated Delivery: 5 - 7 Business Days
Was $139.99
Sale $124.99

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

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RHTAF The price is $1,449.99.
Honda GX Series V-Twin OHV Engine with Electric Start — 688cc, 1 1/8in. x 3.55in. Shaft, Model# GX690RHTAF
5 / 5 (1)
Item# 109864
In Stock Online
Was $1499.99
Sale $1449.99
Save $50.00
Hide Similarities
Engine Displacement (cc)
688 688 688 688 688
Start Type
Electric start Electric, shift type 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 Grain auger/elevator, pressure washer, semi-trailer w/power pack 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 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 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 31/32 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
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 No 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 Manual Remote Manual
Choke Control
Manual Manual Manual 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 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 25/64–4 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 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