Honda Engines GX690

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Honda Engines



Honda V-twin engines offer higher horsepower, improved adaptability, quiet operation, and greater fuel efficency. Not to mention a 3 year warranty.

Common Applications
  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Forestry equipment
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps
Fuel Efficient Operation
  • Fuel economy is similar to fuel injection, with the simplicity of carburetion.
  • Digital CDI ignition system with variable timing
  • Includes a rev limiter to protect against damage from over-revving.
  • Two barrel inner-vent carburetor for more precise fuel metering
  • Insert style rod bearings
High Output Performance
  • Hemispherical combustion chamber delivers rapid combustion
  • 9.3:1 compression ratio generates high power output without the need for premium fuel
  • Forged steel crankshaft
  • Pressure fed crankshaft bearings
Smooth Performance
  • Integrated cylinder and head
  • Racing inspired forged steel connecting rods
Exceptionally Quiet
  • High capacity 36 blade cooling fan
  • Aluminum push rods with steel tips - lighter weight, lower vibration, and quieter operation
Proven Reliability
  • High capacity pump facilitates consistent oil delivery
  • Dual cylindrical air filter
  • Large diameter air intake for superior cooling
  • 3-Year Limited Warranty
  • Oil Alert
Easy to Use and Maintain
  • Hour meter available
  • Conveniently located controls, with several configurations available based on user preference
  • Automotive-type spin-on oil filter
Easy Starting
  • Automatic mechanical de-compression system
  • Variable ignition timing
Emissions Compliant
  • CARB and EPA certified
  • No catalyst necessary
Available Options
  • High capacity charging systems
  • A variety of control box configurations
  • Hour meter
  • Dry fuel versions
  • Engine Type: Air-cooled 4-stroke OHV
  • Bore x Stroke: 78 X 72 mm
  • Displacement: 688 cm3
  • Net Power Output*: 22.1 hp (16.5 kW) @ 3,600 rpm
  • Net Torque: 35.6 lb-ft (48.3 Nm) @ 2,500 rpm
  • PTO Shaft Rotation: Counterclockwise (from PTO shaft side)
  • Compression Ratio: 9.3:1
  • Lamp/Charge coil options: 2.7A, 17A, 26A
  • Carburetor: Horizontal type, two barrel butterfly valve, internal vent
  • Ignition System: Digital CDI with variable ignition timing
  • Starting System: Electric
  • Lubrication System: Forced lubrication
  • Governor System: Mechanical
  • Air cleaner: Dual element
  • Oil Capacity: 2.1 US qt (2.0l)
  • Fuel: Unleaded 86 octane or higher
  • Dry Weight: 96.8 lb (44 kg)
  • Length (min): 15.9" (405 mm)
  • Width (min): 16.1" (410 mm)
  • Height (min): 17.2" ( 438 mm)
PTO Shaft Options
  • V type: Tapered shaft
  • T type: Straight shaft
  • B type: Straight shaft
  • S type: Straight shaft (metric)
  • D type: Straight shaft
*The SAE J1349 standard measures net horsepower with the manufacturer's production muffler and air cleaner in place. Net horsepower more closely correlates with the power the operator will experience when using a Honda engine powered product. The power rating of the engines indicated in this document measures the net power output at 3600 rpm (7000 rpm for model GXH50, GXV50, GX25 and GX35) and net torque at 2500 rpm, as tested on a production engine. Mass production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operation speed of the engine in application, environmental conditions, maintenance and other variables.



Engine Type
Air-cooled 4-stroke OHV
Bore x Stroke
78 x 72 mm
688 cm3
Compression Ratio
22.1 hp (16.5 kW) @ 3,600 rpm
35.6 lb.-ft (48.3 Nm) @ 2,500 rpm
Starting System


15.9 in. (405 mm)
16.1 in. (410 mm)
17.2 in. ( 438 mm)
96.8 lb. (44 kg)

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