The Honda GX690 4-stroke OHV Engine with Electric Start, 688cc, GX690RHXTAF is a commercial-grade horizontal shaft V-Twin engine engineered for pressure washers, sprayers, generators, and other demanding industrial equipment applications requiring reliable power and long-term durability. Delivering 22.1 HP from a 688cc GX Series OHV platform, the GX690 combines smooth operation, strong torque output, and Honda’s legendary reliability into a compact, heavy-duty engine package. Not for sale in CA.
Its 90° V-Twin configuration helps reduce vibration while maintaining a compact footprint, making it ideal for equipment where space, balance, and long-term operator comfort matter. Built with a forged steel crankshaft and integrated cylinder head design, the GX690 is engineered for continuous-duty commercial use.
This GX690 configuration features electric start, a 17-amp charging system, and an oil pressure indicator for enhanced monitoring during operation. Honda’s Digital CDI ignition system with variable timing improves throttle response, fuel efficiency, and overall engine performance while helping reduce emissions.
Whether powering a belt-drive pressure washer, industrial sprayer, agricultural system, or custom trailer build, the GX690RHXTAF delivers the commercial-grade reliability professionals expect from Honda GX engines.
Built for Commercial & Industrial Applications
- Belt-drive pressure washers
- Hot water pressure washer systems
- Industrial sprayers
- Agricultural equipment
- Air compressors
- Generators
- Hydraulic equipment
- Commercial pumping systems
- Custom skid and trailer builds
Can the Honda GX690 pull fuel from a remote fuel tank?
Yes. The GX690RHXTAF uses a diaphragm fuel pump and is capable of drawing fuel from a properly installed remote fuel tank without requiring a gravity-fed setup.
What size shaft does the Honda GX690 use?
The GX690RHXTXA2 features a 1-1/8" diameter horizontal shaft with a 3.96" shaft length and 1/4" keyway.
What RPM does the Honda GX690 run at?
The GX690 operates within approximately 3600–3850 RPM, with 3600 RPM being the recommended operating speed for most applications.
What oil does the Honda GX690 use?
One option is SAE 10W-30 engine oil for general operation across most temperature ranges.
For contractors looking for premium protection under heavy commercial use, a high-quality full synthetic 10W-30 small engine oil is recommended
Commercial GX Series Performance:
Built for demanding industrial and commercial applications requiring dependable long-term performance.
90° V-Twin OHV Configuration:
Helps reduce vibration while maintaining a compact engine footprint.
688cc Commercial Engine Platform:
Delivers 22.1 HP and strong low-end torque for heavy-duty equipment applications.
Oil Pressure Indicator System:
Allows operators to monitor engine oil pressure during operation.
Electric Start System:
Reliable electric starting for commercial equipment setups.
17-Amp Charging System:
Supports battery charging and accessory power requirements on commercial equipment.
Digital CDI Ignition with Variable Timing:
Improves throttle response, fuel efficiency, and engine performance.
Forged Steel Crankshaft:
Heavy-duty crankshaft construction improves durability and engine longevity.
Dual-Element Air Cleaner:
Helps extend filter life and reduce maintenance intervals in dusty environments.
Forced Lubrication System:
Provides consistent oil delivery during demanding operation.
Integrated Rev Limiter:
Helps protect the engine from over-speed damage.
| Specification | Details |
| Brand | Honda |
| Model | GX690RHXTAF |
| Engine Series | GX Series |
| Engine Type | OHV V-Twin |
| Displacement | 688cc |
| Net Power Output | 22.1 HP |
| Net Torque | 35.6 ft-lbs |
| Start Type | Electric Start |
| Shaft diameter | 1-1/8" |
| Shaft Length | 3.96" |
| Shaft Keyway | 1/4" |
| Shaft Rotation | Counter Clockwise (PTO Side) |
| Compression Ratio | 9.3:1 |
| Lubrication System | Forced Lubrication |
| Oil Capacity | 2 qt |
| Recommended Oil | SAE 10W-30 |
| Fuel Type | Unleaded 86 Octane or Higher |
| Fuel Tank Including | No |
| Charging System | 17 Amp |
| Air Cleaner Type | Dual Element |
| Cooling System | Air cooled |
| Low Oil Shutdown | Yes |
| Governor System | Mechanical |
| Weight | 149 lbs |
| Warranty | 3-Year Limited Warranty |
What’s Included
- Honda GX690RHXTAF Engine
- Electric start system
- 17-amp charging system
- Low oil shutdown protection
Important Notes
- Fuel tank not included
- Muffler not included
- Battery required for electric start operation
The Honda GX690RHXTAF engine is backed by Honda’s 3-Year Limited Warranty for commercial and consumer applications.
As an authorized Honda dealer, Spraywell can assist customers with warranty support, product questions, and warranty service coordination.
For complete warranty terms, exclusions, and coverage details, please refer to Honda’s official warranty documentation or contact Spraywell directly at 561-964-3228.
