RELIABLE V-TWIN POWER
GX630 Series
Honda GX630 series engines deliver the dependable performance, durability and power needed for demanding commercial and industrial applications. Designed with a powerful V-twin configuration, these air-cooled, 4-stroke engines feature a high-output design, reliable starting, and efficient operation to support consistent performance in tough working conditions. Their combination of power, smooth operation and long-lasting construction makes Honda's line of GX630 series engines a dependable choice for equipment manufacturers and professionals who need reliable power day after day. Common applications include commercial riding lawn mowers, fire-fighting equipment, pressure washers, concrete and masonry saws, stump grinders, skid steers and other heavy-duty power equipment requiring dependable engine performance.
V-Twin Design
The placement of the GX630's two cylinders in the formation of a "V" provides high power output for heavy duty tasks and continuous use, offers superior balance for smoother performance and less vibration and improves the airflow around the cylinders for cooler operation.
Capacitor Discharge Ignition
The GX630's CDI system stores electrical energy in an internal capacitor and releases it in a fast, high-voltage burst to the spark plug providing reliable cold starts, high RPM performance and quick voltage rise time.
Precision Engineered Components
Honda's high-quality parts are less-prone to wear and corrosion for a longer engine life and provide minimal vibration and increased stability during operation.
Air-Cooled
Simple, lightweight engine design that is easy to maintain
4-Stroke
No oil/gas mixing required for cleaner emissions and better fuel efficiency
High Compression Ratio
Increased power output and thermal efficiency without an increase in engine size
GX630 Engine Series Specs
Learn more about the key specifications present on all gas-powered Honda GX630 engine models
Displacement: 688cc | 41.97 cu. in.
Net Horsepower: 20.8 HP @ 3600 RPM
Max Net Torque: 35.6 ft lbs @ 2500 RPM
Bore x Stroke: 3.07" x 2.83" | 78mm x 72mm
Ignition System: CDI Type Magneto
Oil Capacity: 1.59 US qt
Lubrication System: Forced Feed
Compression Ratio: 9.3 (+/- 0.2) : 1
Engine Type: Air-Cooled | 4-Stroke | OHV | Twin Cylinder
Warranty: 3 Year Commercial & Consumer
Compare GX630 Engine Models
Explore the key technical differences between the Honda GX630 engine models we offer
Engines within the same series may look the same, but certain specifications won't be obvious in a photo! These important specs ultimately determine whether or not an engine is compatible with your unique application and equipment.
Please note: the most accurate way to determine the correct replacement engine is by identifying and providing your current engine's model and spec numbers. Learn where to find your engine's identifying information in our Find Your Engine Model Number guide >
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| Engine | GX630 QAF | GX630 QZB2 | GX630 QZB3 | GX630 TXF2 |
| Crankshaft Diameter |
1" | 1" | 1" | 1-1/8" |
| Crankshaft Length |
2-29/32" | 2-29/32" | 2-29/32" | 3.78" |
| Air Filter |
Dual Element | Dual Element | Dual Element | Donaldson Snorkel System |
| Starting System | Electric | Electric | Electric | Electric |
| Charging | 17 Amp | 17 Amp | 17 Amp | 17 Amp |
| Controls | No key switch, throttle or choke - no control box | Control box with switch (Remote wire throttle and choke) | Control box with switch (Remote wire throttle and choke) | Key switch on board (Remote throttle and choke) |
| Important Notes |
Needs ignition switch and harness if replacing GX610, GX620 or GX670 engine | Oil filter is perpendicular to crankshaft | Oil filter is parallel to crankshaft | Donaldson snorkel air cleaner ships separately |
| Common Applications |
Utility Vehicles, Compactor Plates, Trenchers, Hydraulic Power Packs, Soil/Asphalt Rollers | Concrete / Crack Routers, Tire Cutters, Concrete Saws | Stump Grinders, Fire Truck Pumps, Turf Sweepers, Pressure Washers, Skid Steer Loaders | Concrete Saws |
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