The Honda GX690 4-stroke OHV Engine with Electric Start, 688cc, GX690RHXA2 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.
Honda’s Digital CDI ignition system with variable timing improves fuel efficiency and throttle response while helping reduce emissions. The upgraded dual-element air cleaner extends filter service intervals significantly, reducing downtime and maintenance frequency in dusty environments.
The Honda GX690 (GX690RHXTXA2) features electric start, low oil shutdown protection, forced lubrication, and a heavy-duty ball bearing supported crankshaft—making it a trusted choice for contractors and OEM equipment manufacturers alike.
Recommended Applications
- Commercial pressure washer systems
- Belt-drive skid builds
- Hot water pressure washers
- Industrial spraying equipment
- Agricultural sprayers
- Air compressor systems
- Generator applications
- Commercial pumping systems
- Custom trailer and skid builds
Can the Honda GX690 pull fuel from a gas tank?
Yes. The GX690 is capable of drawing fuel from a properly installed remote fuel tank and does not require a gravity-fed fuel 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 commercial and industrial applications requiring long runtime and reliability.
90° V-Twin Configuration:
Reduces vibration while maintaining a compact engine footprint.
688cc OHV Engine Design:
Delivers strong torque output and dependable performance under heavy load.
Forged Steel Crankshaft:
Heavy-duty crankshaft construction improves durability and engine longevity.
Digital CDI Ignition System:
Variable ignition timing improves fuel economy, throttle response, and emissions performance.
Electric Start System:
Provides reliable push-button starting for commercial equipment setups.
Improved Dual-Element Air Filtration:
Extended service intervals help reduce maintenance downtime in dusty conditions.
Forced Lubrication System:
Helps maintain proper oil circulation during demanding operation.
Low Oil Shutdown Protection:
Protects the engine from damage caused by low oil levels.
Ball Bearing Supported Crankshaft:
Designed for long-term durability in heavy-duty applications
| Specification | Details |
| Brand | Honda |
| Model | GX690RHXTXA2 |
| 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 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 GX690RHXTXA2 Engine
- Electric start system
- Charging system
- Low oil shutdown protection
Important Notes
- Fuel tank not included
- Muffler not included
- Battery required for electric start operation
The Honda GX690RHXTXA2 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.
