Sylvie Willis
Motorcycles typically run on gasoline, not diesel fuel. While diesel fuel is commonly used in trucks, it is not suitable for motorcycles due to several factors. Firstly, a diesel engine is heavier and has lower power output compared to a gasoline engine. The weight of the engine and the unique gear setup required for a diesel motorcycle result in a heavier bike overall, which negatively impacts fuel economy and riding experience. Additionally, diesel fuel is more expensive, and meeting strict diesel emission standards further contributes to the higher cost of diesel engines. While there have been instances of motorcycles being modified to run on diesel, such as the KLR650 used by the USMC, these are not common. Misfuelling motorcycles with diesel can cause serious engine damage, and riders should be cautious to avoid this mistake.
Can motorcycles take diesel fuel?
| Characteristics | Values |
|---|---|
| Can motorcycles use diesel fuel? | No, motorcycles cannot use diesel fuel. Motorcycles are petrol-based vehicles and using diesel fuel can cause serious engine damage. |
| What happens if diesel is used in a motorcycle? | The motorcycle will likely backfire and stop soon after. Plugs can get soaked in diesel and cause ignition issues. |
| What to do if diesel is added to a motorcycle? | Do not start the motorcycle or turn the ignition on. Push the bike to the side and call a recovery or fuel draining service to drain the diesel safely. |
| Are there diesel-based motorcycles? | Diesel-based motorcycles are not common due to weight, cost, and power constraints. However, some modified or military motorcycles can use diesel or multiple fuel types. |
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What You'll Learn
What happens if you put diesel in a motorcycle?
Motorcycles are typically not equipped to run on diesel fuel, and it is important to understand the potential consequences of using the wrong type of fuel. While it may seem like a simple mistake, putting diesel in a motorcycle can lead to several issues and potentially costly repairs.
Firstly, it is essential to recognize that motorcycles with petrol engines are designed to run on unleaded petrol, not diesel. If diesel fuel is added to the tank, it can cause serious engine damage. This is because diesel has a higher viscosity and burns at a different temperature than petrol. As a result, the diesel may not ignite properly in the engine, leading to incomplete combustion and possible engine seizure.
Additionally, diesel in a motorcycle's tank can cause the plugs to become soaked and fouled. This can lead to backfiring, which is not only dangerous but also indicates that the engine is not functioning correctly. In some cases, the motorcycle may run for a short distance on diesel, but it will likely experience performance issues and eventually cut out.
If you realize you have accidentally filled your motorcycle with diesel, it is crucial to take immediate action. Do not start the engine or turn the ignition on, as this will prime the fuel pump and cause the diesel to enter the fuel system. Instead, push the motorcycle to a safe location and contact a recovery service or a specialist fuel draining service. They will be able to safely drain the diesel from the tank and may also recommend flushing the system with a fuel cleaner and adding fresh unleaded petrol.
While it may be tempting to ride the motorcycle to the nearest service station, doing so can cause further complications and increase the cost of repairs. It is always best to seek professional assistance as soon as possible to minimize the potential damage and ensure the safe and proper functioning of your motorcycle.
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What to do if you misfuel your motorcycle
It is not recommended to pour diesel into a motorcycle as they are intended for different vehicle engines. However, there are a few dirt bikes that can run on diesel. If you pour diesel into a gasoline-powered motorcycle, your motorcycle might not start. Even if it does, it will probably emit a lot of smoke from the exhaust and quickly lose power. When riding, it can even stall or discharge flames from the exhaust, which is extremely dangerous and might even cause a brush fire.
If you misfuel your motorcycle, the first thing to do is to not start your engine or turn on the ignition. Pushing the bike to one side, call your recovery service or a specialist fuel draining service to ensure the diesel is safely drained. If you do happen to ride with diesel in your tank, it will most likely backfire and stop pretty soon afterwards.
If you have added more than three percent diesel to a gasoline motorcycle, you may experience decreased engine performance, stalling, and possibly even engine damage. In this case, it is important to get the motorcycle checked out by a professional mechanic to determine the extent of the damage and whether or not the motorcycle can be driven.
To drain the diesel fuel, close the petcock, a valve on the bottom of the fuel tank. Then, place a container below the fuel line and remove the fuel line from the carburetor. Let the diesel drain out completely. If your motorcycle has a carburetor, open the drain plug at the bottom of the float bowl in the carburetor and drain it completely. Finally, fill the fuel tank with the right fuel.
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The differences between diesel and petrol engines
Motorcycles typically use petrol in their engines, and filling a motorcycle tank with diesel can cause serious engine damage. If diesel is accidentally added to a motorcycle tank, it is advised not to turn on the ignition or start the motorcycle. Instead, the bike should be pushed to the side, and a recovery or specialist fuel draining service should be called to drain the diesel safely.
Petrol and diesel engines are both internal combustion engines, but they differ in their working principles, fuel usage, efficiency, and applications.
Petrol engines, also known as spark-ignition engines, use a spark plug to ignite a fuel-air mixture, creating the power needed to drive the engine. This mixture of fuel and air is compressed with a spark. Petrol engines are typically used in lighter vehicles such as cars, motorcycles, scooters, and machines.
On the other hand, diesel engines, or compression-ignition engines, rely on the compression of air to high temperatures, which ignites the diesel fuel upon injection. In a diesel engine, only air is compressed, and fuel is injected into the compressed air. Diesel is used in heavier machinery such as tractors, trucks, and buses.
The use of spark plugs in petrol engines and fuel injectors in diesel engines is another distinction between the two types of engines. Diesel engines are more fuel-efficient but have a slower ignition process than petrol engines.
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The process of draining diesel from a motorcycle
Motorcycles are not designed to run on diesel fuel and doing so can cause serious engine damage. If you have accidentally filled your motorcycle with diesel, do not start your engine or turn the ignition on, as this will prime the fuel pump. Push the bike to one side and call a recovery or specialist fuel draining service to ensure the diesel is drained safely.
There are a few methods that can be used to drain diesel from a motorcycle. One method is to use a siphon hose to remove the diesel from the tank. Here is a step-by-step guide on how to do this:
- Obtain a clear vinyl hose with a diameter of 3/8 inches and a length of 5 feet.
- Insert one end of the hose into the diesel tank and the other end into a gas can.
- Use a rag or washcloth to create a seal around the filler hole and the hose.
- Blow into the short hose to create pressure and start the siphon.
- Diesel will begin to drain from the tank into the gas can.
Another method mentioned by a user on a motorcycle forum is to drain the diesel by mouth. They describe the process as follows:
- Place one end of the hose into the tank and the other end into a gas can.
- Keep the exit end of the hose below the inlet end.
- Use your mouth to create suction and draw the diesel into the hose.
- Once the diesel reaches the end of the hose, cover the end with your thumb and place the hose in the gas can.
It is important to note that this method can be dangerous and unpleasant, as it involves the risk of ingesting diesel fuel. Therefore, it is recommended to use the blowing method described earlier or to seek professional help from a mechanic or recovery service.
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Examples of diesel motorcycles
While diesel motorcycles are rare, there have been some notable examples over the years. Here are some of the most well-known diesel motorcycles:
Royal Enfield Taurus
The Royal Enfield Taurus is widely considered the most famous diesel motorcycle ever produced. It features a classic aesthetic paired with a dependable 325cc four-stroke air-cooled diesel engine. The Taurus was commercially produced from 1993 to 2001 and is often regarded as the pinnacle of the marginal diesel motorcycle craze.
Sommer Diesel 462
The Sommer Diesel 462 is a modern diesel motorcycle that pays homage to the classic 60s British bike style. It is powered by a 462cc single-cylinder diesel engine, installed into a Royal Enfield frame, and can achieve a top speed of 65 mph. Sommer Motorradtechnik, a German company, hand-builds these motorcycles in small batches.
Hayes M1030
The Hayes M1030 is a military-grade diesel motorcycle used by the US Marine Corps. It is built on a Kawasaki KLR640 platform and is equipped with a 670cc liquid-cooled engine, capable of reaching top speeds of 90 mph. The M1030's versatility and ability to run on various fuel types, including biodiesel, gasoline, truck diesel, and jet fuel, make it a favourite among military personnel.
Track T-800CDI
The Track T-800CDI is a sleek and modern-looking diesel motorcycle produced by the Dutch company Evaproducts. It features a turbocharged 3-cylinder engine with a fuel efficiency of up to 140 mpg and a top speed of 110 mph. Only 50 of these motorcycles have been sold, making them a rare find.
Hero Motorcorp RNT
The Hero Motorcorp RNT is a unique diesel-hybrid scooter. It features a 150cc single-cylinder diesel engine that produces 13.5 horsepower and 26 pound-feet of torque. Additionally, it has an electric motor in the front hub, making it a two-wheel-drive scooter. The engine can also be used as a generator, providing electricity when out in the wild.
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Frequently asked questions
No, motorcycles cannot take diesel fuel. Motorcycles are petrol-based vehicles and filling them with diesel can cause serious engine damage.
If you realise your mistake before turning on the ignition, push the bike to the side and call a recovery or fuel draining service to drain the diesel from the tank. If you turn on the ignition, the diesel will likely cause the bike to backfire and stop soon after.
Some gas stations offer both diesel and petrol pumps, so it is easy to get confused and select the wrong option.
While diesel motorcycles are not common, there are some examples of modified motorcycles that can run on diesel, such as the USMC's KLR650, which is a multi-fuel vehicle. However, diesel engines tend to be heavier and less powerful than petrol engines, which makes them less suitable for motorcycles.
