Description
Honda GX240 QA2 Engine Overview
The Honda GX240 QA2 Horizontal Engine is a professional replacement engine built for compatible equipment requiring a 270cc horizontal shaft gasoline engine with a straight PTO shaft and reliable commercial-duty performance.
This model is listed as GX240-QA2 and also referenced as GX240UT2QA2. It produces 7.9 net horsepower and uses a single-cylinder OHV design with a cast iron cylinder bore to support durability in demanding equipment applications.
The engine uses a recoil starter, gasoline fuel system, float carburetor, manual choke, and digital CDI ignition with variable ignition timing. It also includes a standard muffler with spark arrestor, exhaust pipe protector, and deflector based on the supplied product details.
This Honda GX engine is designed for economical, quiet operation while still delivering dependable output for commercial and industrial use. It is commonly selected for compatible water pumps, generators, small vehicles, commercial lawn and garden equipment, and similar power equipment.
Because crankshaft dimensions, shaft type, keyway width, PTO height, rotation direction, and mounting details are critical for fitment, buyers should compare the original engine specifications before ordering.
Equipment Fitment and Common Applications
The Honda GX240 QA2 Horizontal Engine is intended for compatible equipment requiring a 270cc horizontal gasoline engine with recoil start, straight crankshaft, and the listed PTO dimensions.
Common applications include compatible water pumps, small vehicles, commercial lawn and garden equipment, generators, and other equipment designed for this Honda GX240 shaft and mounting configuration.
Fitment should be verified by comparing the original engine model, crankshaft orientation, crankshaft type, crankshaft diameter, crankshaft length, crankshaft end tapped size, keyway width, PTO height, rotation direction, bolt circle, starter type, choke setup, muffler clearance, and equipment mounting layout.
This engine uses a 1-inch x 3-31/64-inch crankshaft, 1/4-inch keyway, 7/16-20 tapped crankshaft end, counterclockwise PTO rotation, and 5-1/4-inch PTO height. These details should match the original engine and driven equipment.
This Honda GX240 QA2 replacement engine is commonly selected when the original engine has suffered hard starting, low compression, oil-related damage, ignition failure, carburetor issues, internal wear, or general service-life decline.
270cc Commercial Engine Performance
The Honda GX240 QA2 uses a 270cc single-cylinder gasoline engine layout and produces 7.9 net HP. This makes it a practical choice for equipment that requires dependable mid-size commercial engine power.
The horizontal straight crankshaft configuration is important for equipment that uses direct belt, pulley, coupling, pump, or generator-style drive arrangements. This model has no gear reduction, so buyers should only select it for equipment designed for a straight-shaft GX240 setup.
The cast iron cylinder bore supports durability, while the dual-element air cleaner helps protect the engine from dust and debris in outdoor or commercial environments.
The digital CDI ignition with variable ignition timing supports dependable spark delivery and smoother operation. The float carburetor and manual choke provide a simple and serviceable fuel system layout.
For equipment owners and repair shops, this engine offers a strong balance of power, serviceability, and long-term reliability when matched to the correct application.
Crankshaft and Installation Details
Crankshaft fitment is one of the most important details when selecting the Honda GX240 QA2 Horizontal Engine. This model uses a 1-inch x 3-31/64-inch straight crankshaft.
The crankshaft length is 3-31/64 inches, and the crankshaft end tapped size is 7/16-20. The crankshaft keyway width is 1/4 inch.
The crankshaft orientation is horizontal, and the crankshaft type is straight. This engine does not include gear reduction, so it should not be used as a replacement for equipment requiring a reduction gearbox unless compatibility has been professionally confirmed.
The crankshaft rotation direction from the PTO side is counterclockwise. Rotation direction must match the driven equipment to avoid incorrect operation, belt alignment issues, pump mismatch, generator mismatch, or equipment damage.
The listed PTO height is 5-1/4 inches, and the bolt circle is listed as 5, 6-1/2. These specifications should be compared directly with the original equipment.
Starting, Ignition, and Fuel System
The Honda GX240 QA2 includes recoil start, making it suitable for compatible equipment that uses a manual pull-start system.
This engine uses a gasoline fuel system with a float carburetor and manual choke control. It does not include a fuel pump, so buyers should confirm that the equipment’s fuel tank position and fuel delivery setup are compatible with gravity-feed operation.
The ignition system is digital CDI with variable ignition timing, which supports reliable spark delivery and efficient engine operation.
This model does not include an oil cooler. The oil capacity is listed as 38, and the engine includes low oil shutdown. The supplied specifications list low oil alert: no and low oil shutdown: yes, so operators should still check oil level regularly during service.
Muffler, Oil Protection, and CARB Compliance
The supplied description states that the Honda GX240 QA2 Horizontal Engine includes a standard muffler with spark arrestor, exhaust pipe protector, and deflector. These components support practical equipment operation and help reduce exposure around the exhaust area when installed correctly.
The engine includes a low oil shutdown system, which helps protect the engine by shutting it down when oil conditions are unsafe. This is especially useful for equipment used in commercial, outdoor, and demanding operating environments.
The product is also listed as 50-state CARB compliant, making it suitable for buyers who need a compliant replacement engine for regulated markets.
Before ordering, buyers should still confirm that the engine configuration, emissions compliance, muffler layout, and equipment requirements match the original application.
Replacement Model Coverage
The Honda GX240 QA2 Horizontal Engine replaces multiple related GX240 model references. The supplied replacement list includes GX240U1QA2, GX240-QA2, GX240K1QA2, GX240UT1QA2, GX240-U1QA2, GX240U1-QA2, GX240QA2, GX240K1-QA2, GX240UT2QA2, and GX240-K1-QA2.
These replacement references are helpful for buyers comparing an older engine tag against the current product number. Even when the model reference appears similar, buyers should still verify crankshaft dimensions, shaft length, keyway, tapped end size, PTO height, rotation direction, bolt circle, and equipment mounting before ordering.
The most important match points are the GX240-QA2 / GX240UT2QA2 identification, 270cc displacement, 1-inch x 3-31/64-inch shaft, 1/4-inch keyway, horizontal orientation, straight shaft, and recoil start configuration.
Key Benefits for Equipment Owners and Repair Shops
The Honda GX240 QA2 Horizontal Engine gives equipment owners a dependable replacement option for compatible commercial and industrial machines.
The first benefit is fitment clarity. The listed GX240-QA2 model number, GX240UT2QA2 reference, 1-inch x 3-31/64-inch crankshaft, 1/4-inch keyway, 7/16-20 tapped end, counterclockwise PTO rotation, and 5-1/4-inch PTO height help buyers and installers match the engine accurately.
The second benefit is commercial-grade durability. The cast iron cylinder bore, dual-element air cleaner, digital CDI ignition, and low oil shutdown support reliable operation in demanding environments.
The third benefit is broad equipment use. This engine is commonly used in compatible pumps, generators, small vehicles, and commercial lawn and garden equipment.
The 3-year consumer and commercial warranty also adds confidence for buyers replacing an important equipment engine.
Who This Engine Is Best For
This engine is best for equipment owners, repair shops, landscapers, agricultural users, construction crews, generator service technicians, pump repair businesses, small-engine mechanics, and professional installers who need a compatible Honda GX240 QA2 horizontal engine.
It is suitable for equipment requiring GX240-QA2, GX240UT2QA2, 270cc displacement, 7.9 net HP, recoil start, horizontal straight crankshaft, 1-inch x 3-31/64-inch shaft, 1/4-inch keyway, and counterclockwise PTO rotation.
This product is a strong choice when the original engine has failed because of low compression, hard starting, worn internal parts, ignition failure, carburetor-related issues, oil-related damage, or general engine wear.
This engine is not intended for equipment requiring a vertical shaft engine, gear-reduction engine, electric-start-only configuration, different crankshaft diameter, different shaft length, different keyway, different tapped end size, different PTO height, different rotation direction, or fuel-pump-equipped setup unless fitment has been professionally confirmed.
Technical Details and Included Specifications
The Honda GX240 QA2 Horizontal Engine is listed as a 270cc gasoline horizontal engine with 7.9 net HP, recoil start, straight crankshaft, and no gear reduction.
| Specification | Details |
|---|---|
| Product Type | Horizontal shaft replacement engine |
| Brand | Honda |
| Model Number | GX240-QA2 |
| Additional Reference | GX240UT2QA2 |
| Engine Series | Honda GX240 |
| Displacement | 270cc |
| Net Horsepower | 7.9 net HP |
| Fuel System | Gasoline |
| Starter Type | Recoil |
| Crankshaft Orientation | Horizontal |
| Crankshaft Type | Straight |
| Gear Reduction | No |
| Crankshaft Dimensions | 1 in. x 3-31/64 in. |
| Crankshaft Length | 3-31/64 in. |
| Crankshaft End Tapped Size | 7/16-20 |
| Crankshaft Keyway Width | 1/4 in. |
| Rotation Direction From PTO Side | Counterclockwise |
| Cylinders | 1 |
| Cylinder Bore Type | Cast iron |
| Air Cleaner Type | Dual element |
| Fuel Pump | No |
| Oil Cooler | No |
| Oil Capacity | 38 |
| Low Oil Alert | No |
| Low Oil Shutdown | Yes |
| Ignition System | Digital CDI with variable ignition timing |
| Carburetor Type | Float |
| Choke Control | Manual |
| Bolt Circle | 5, 6-1/2 |
| PTO Height | 5-1/4 in. |
| Muffler | Standard muffler with spark arrestor |
| Emissions Compliance | 50-state CARB compliant |
| Shipping Weight | 66 lb |
| Warranty | 3-year consumer and commercial |
Replacement Model References
| Replaces / Cross-Reference Models |
| GX240U1QA2 |
| GX240-QA2 |
| GX240K1QA2 |
| GX240UT1QA2 |
| GX240-U1QA2 |
| GX240U1-QA2 |
| GX240QA2 |
| GX240K1-QA2 |
| GX240UT2QA2 |
| GX240-K1-QA2 |
Fitment Support and Ordering Notes
Before ordering the Honda GX240 QA2 Horizontal Engine, buyers should confirm that it matches the original equipment setup. Important details include model number, engine series, displacement, crankshaft orientation, shaft type, crankshaft diameter, crankshaft length, keyway width, tapped end size, PTO height, rotation direction, bolt circle, starter type, choke control, muffler clearance, and equipment mounting.
This engine uses a horizontal straight shaft with no gear reduction, so it should not be selected for vertical shaft or gear-reduction applications unless compatibility has been confirmed.
The crankshaft is 1 inch x 3-31/64 inches with a 1/4-inch keyway, and the PTO rotation is counterclockwise from the PTO side. These specifications should match the original engine and driven equipment.
Customers can also compare this product with other Honda GX engines, compatible horizontal engines, small-engine replacement parts, air filters, spark plugs, recoil components, engine oil, fuel-system parts, mufflers, mounting hardware, and service parts when planning a complete repair.
Frequently Asked Questions
What is the Honda GX240 QA2 Horizontal Engine used for?
The Honda GX240 QA2 Horizontal Engine is used for compatible equipment requiring a 270cc horizontal gasoline engine with 7.9 net HP, recoil start, and a 1-inch x 3-31/64-inch straight crankshaft.
What model number is this Honda engine?
The model number is GX240-QA2. It is also referenced as GX240UT2QA2 and replaces several related GX240 QA2 model variations.
Does this Honda GX240 engine have electric start?
No. This model uses recoil start. Buyers needing electric start should confirm a different compatible GX240 configuration before ordering.
What are the crankshaft dimensions?
The crankshaft dimensions are 1 inch x 3-31/64 inches. The crankshaft has a 1/4-inch keyway, a 7/16-20 tapped end, and counterclockwise rotation from the PTO side.
Does this engine have gear reduction?
No. The Honda GX240 QA2 uses a straight crankshaft and has no gear reduction. It should only be used in compatible equipment designed for this output setup.
Does this engine include low oil shutdown?
Yes. The supplied specifications list low oil shutdown: yes. The listing also states low oil alert: no, so regular oil-level checks are still important.
What warranty comes with this engine?
The Honda GX240 QA2 Horizontal Engine includes a 3-year consumer and commercial warranty. Buyers should review warranty terms for installation, maintenance, and coverage requirements.
