
The Kohler XT6 engine is a powerful and versatile engine that delivers exceptional performance for a range of applications. With its single-cylinder, four-course, and air-cooled design, it offers a large fuel inlet and electronic ignition, making it a popular choice for lawnmowers and tractors. When it comes to the fuel line size for this engine, it's essential to ensure optimal performance and fuel delivery. The specific fuel line size can vary, but it typically ranges from 1/4 to 3/16, with some users opting for spring clamps or worm-drive clamps for secure connections.
| Characteristics | Values |
|---|---|
| Number of cylinders | 1 |
| Cooling | Air-cooled |
| Fuel inlet | Large |
| Ignition | Electronic |
| Fuel line size | 1/4" or 3/16" |
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What You'll Learn

Kohler XT6 engine specifications
The Kohler XT6 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, and a vertical PTO shaft. The engine has a splash-type lubrication system and a fixed main jet carburetor. It is also equipped with a dependable electronic magneto ignition system.
The Kohler XT6 engine's cylinder bore is 65.0 mm (2.60 in), and its piston stroke is 45.0 mm (1.80 in), resulting in a total displacement of 149 cc. The engine has a compression ratio rating of 9.2:1 and produces 3.8 PS (2.8 KW; 3.8 HP) at 3,600 rpm. At 2,800 rpm, the engine delivers peak torque of 8.5 Nm (0.87 kg·m; 6.3 ft·lb).
The Kohler XT6 is an air-cooled, single-cylinder engine with a vertical shaft. It is designed for use in lawnmowers and other small commercial equipment. The engine features an aluminum block with cast iron cylinder liners, which provides a balance of durability and weight reduction.
The XT6 engine's OHV design and vertical PTO shaft contribute to its compact form factor, making it suitable for a range of applications where space is limited. The splash-type lubrication system and fixed main jet carburetor ensure reliable performance, while the electronic magneto ignition system provides dependable starting and operation.
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Fuel shut-off valve
The Kohler Courage XT-6 engine is equipped with a fuel shut-off valve. This valve controls the flow of fuel to the engine, allowing it to be shut off when necessary. The fuel shut-off valve is an important component of the fuel system, ensuring the engine receives the correct amount of fuel for proper operation.
The Kohler Courage XT-6 engine is a powerful and reliable engine used in a variety of applications, including generators, lawn mowers, and other outdoor power equipment. The fuel system in this engine plays a critical role in delivering fuel to the engine, and the fuel shut-off valve is an integral part of this system.
This valve is designed to stop the flow of fuel when the engine is not in use, helping to prevent fuel leakage and waste. Additionally, the fuel shut-off valve can be used to isolate the fuel system during maintenance or repairs, making it a valuable tool for service technicians.
Kohler recommends that the fuel shut-off valve be inspected and serviced at regular intervals to ensure its proper functioning. Over time, the valve may become clogged or damaged, affecting the fuel flow and engine performance. Therefore, regular maintenance and cleaning of the valve are essential to keep the engine running smoothly.
The Kohler Courage XT-6 engine fuel shut-off valve is identified by part number #2546214S and can be purchased from authorized Kohler dealers or online retailers. It is important to follow the manufacturer's guidelines when installing or servicing the valve to ensure optimal performance and safety.
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Fuel filter
The Kohler XT6 engine is equipped with a fuel filter. Kohler engines are known for their high quality and performance, and proper maintenance is essential to ensure the engine's longevity.
The fuel filter in an internal combustion engine like the Kohler XT6 plays a critical role in ensuring the smooth operation of the engine. Its primary function is to remove impurities, such as dirt, rust, and debris, from the fuel before it enters the engine. This is crucial because contaminants can cause damage to the engine's internal components, leading to reduced performance, increased fuel consumption, and even engine failure.
The fuel filter is typically located between the fuel tank and the engine, allowing it to capture contaminants as the fuel flows from the tank to the engine. It is usually placed in an easily accessible location to facilitate regular maintenance and replacement. Over time, the fuel filter can become clogged with the impurities it captures, leading to restricted fuel flow and potential engine performance issues. Therefore, it is essential to regularly inspect, clean, or replace the fuel filter as per the manufacturer's recommendations.
For the Kohler XT6 engine, the specific fuel filter model and replacement interval should be referenced in the owner's manual or through authorized Kohler service centers. The fuel filter plays a vital role in maintaining the engine's performance and longevity, and by ensuring proper maintenance, you can help keep your Kohler XT6 engine running efficiently for years to come.
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Fuel line size for Kohler 18hp
The Kohler 18hp engine fuel line has an inner diameter of 1/4". The wall thickness is relatively thin, and it is recommended to use spring clamps on the fuel lines as they are easier to work with and less likely to damage the rubber. Worm-drive clamps can be difficult to manage in tight spots and may damage the rubber over time.
When purchasing a fuel line, it is important to consider the quality of the product. Some users have reported issues with cheap, low-quality SS worm gear clamps that strip out easily. It is worth investing in a more reliable product to avoid future issues.
One user reported that they had purchased enough 1/4" fuel line to replace the lines on both their tractors. They noted that the new line had a larger outer diameter than the old line, which is worth considering when ordering fuel lines for the Kohler 18hp engine.
It is always a good idea to consult a professional or a mechanic when making repairs or replacements to ensure the work is done correctly and safely.
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Fuel line and accessories
The Kohler XT6 engine is used in lawnmowers and has a range of fuel line and accessories available.
Fuel Filters
There are several fuel filters compatible with the Kohler XT6 engine. The DOP24-050-13-S is an OEM Kohler Engines Fuel Filter with extra capacity and a 15-micron rating for 1/4" fuel lines. The DOP25-050-07-S and DOP25-050-21-S are also OEM Kohler Engines Fuel filters but with a 75-micron rating and the ability to be used with either 3/16" or 1/4" fuel lines. The DOP25-050-22-S is another option, with a 51-micron rating and compatibility with 1/4" fuel lines. Additionally, the DOP07-331 and DOP07-332 fuel filters are quality aftermarket parts that fit 1/4" and 5/16" fuel lines.
Fuel Caps
Kohler offers several fuel cap options as well. The DOP14-227-11 is a fuel cap assembly that replaces part numbers 1422711 and 14 227 11-S. The DOP14-227-19 fuel cap replaces part numbers 1422719 and 14 227 19-S, fitting fuel tank number 14-065-63. The DOP14-227-20 is another fuel cap assembly option, replacing part numbers 14-227-20 and 14 227 20. The DOP1422716 fuel cap replaces multiple part numbers, including 14 227 16-S, 1422716, and 14 227 15-S.
Fuel Line
The DOP12-123-19-S is an original equipment Kohler fuel line, replacing part numbers 1212319 and 12 123 19-S.
Fuel Pump and Accessories
Kohler also provides a range of fuel pump and related accessories. The DOP24-393-16-S is an OEM Kohler Engines fuel pump used on Command CH13-Spec # 22572 and various CH series engines. The DOP24-393-52 is an original Kohler Electric fuel pump assembly compatible with CH26S-78511 engines and others. The DOP41-559-05-S is another original Kohler fuel pump with part number 41-559-05-S. The DOP52-559-03-S is an OEM Kohler Engines fuel pump that replaces 52-559-01-S and is used on MV 20 series engines. The DOP24-399-04 is an original Kohler part fuel rail that replaces several part numbers, including 24 399 04-S and 2439904. The DOP20-126-12-S is a fuel pump bracket, and the DOP47 559 11-S is a fuel pump kit that fits models KOHLER K241-K341 and M10-M12. Lastly, the DOP52-559-03 is a fuel pump kit that includes the fuel pump, gasket, flat washer, 90-degree hose connector, and connector, replacing part number 5255903 and 52 559 03-S.
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Frequently asked questions
Kohler XT6 engines have a large fuel inlet. The fuel filter size is 1/4".
The Kohler XT6 engine has 1 cylinder.
Yes, the Kohler XT6 engine is gasoline-powered.
The Kohler XT6 engine has an electronic ignition.
The fuel filter size of the Kohler XT6 engine is 1/4".











































