Have you been riding a dirt bike for a while but been left wondering if you’re running with the best possible fuel?
Maybe your engine isn’t giving you its full power, or you’ve noticed your carburetors filling with gummy deposits or debris. You may even have noticed some pinging or knocking on your engine as you ride.
The solution just might be investing in a higher-quality fuel.
The right gas will both give you more power and keep your bike in better condition. If you want to up your game and find the best gas for dirt bikes, this review will help you make your pick.
If you’re in a hurry, these are the best gas for dirt bikes options:
Before we get into the full reviews of these, check out my guide below so you can fill that brain of yours with knowledge.
What Kind of Gas Do Dirt Bikes Use?
You can use premium gas from the pump on your dirt bike, but many riders prefer top-quality racing fuels. Look for high-octane, non-ethanol-based fuels especially made for racing, if possible. Check the user’s manual, and don’t forget to mix with oil on 2-stroke bikes.
Here are the basics you should know when looking for the best gas for dirt bikes.
There’ll likely be a couple of octane options fat your gas station, with the higher numbers indicating a more expensive fuel.
However, a high-octane gas doesn’t automatically mean more power, only that the fuel runs cooler.
A higher octane rating means the fuel needs a higher temperature to ignite, avoiding knocking or prematurely igniting the fuel in the engine. This knocking can cause damage to your bike in the long run and bother you when riding.
Depending on where you live, you might not always find a high-octane fuel. For 4-stroke engines, a lower than 90-octane gas will probably work fine, so you can go to your regular gas station to fill up before you head to the track.
Usually, anything over 90 octanes will work on a dirt bike, except for the super high-octane fuels meant for aviation. You should be safe with around 91 to 94 octanes.
If you can’t find high-octane fuel, use an octane booster or race fuel concentrate, like the RaceGas Race Fuel Concentrate. Mix these with your regular fuel to supercharge it, avoid knocking and get more power.
Perhaps the most important thing when buying a dirt bike fuel, especially for a 2-stroke engine, is that it isn’t ethanol-based.
Ethanol is commonly used in fuels because it works as an octane booster, but the problem with ethanol is that it attracts moisture from the atmosphere into your tank and may end up causing corrosion. Over time, it can also clog your engine and your pistons.
The best option is a fuel that doesn’t include any ethanol. All the race fuels included in our review are non-ethanol based. However, you might not find quality gas nearby, so pick a fuel that has up to 10 percent of ethanol.
Occasionally, fuel with a bit of ethanol shouldn’t affect on your bike, but I don’t recommend doing this regularly to avoid the moisture/corrosion issue. Also, burn off any unused fuel or empty the tank after your ride.
2-Stroke vs. 4-Stroke Bikes
Depending on your ride, you’ll need something a bit different. Here are some of the differences between 4-stroke and 2-stroke engines so you’ll know what to look for.
A 4-stroke bike is heavier than a 2-stroke bike, meaning they require more energy to move. They’re also more stable than 2-stroke bikes, depending on the terrain you ride on.
The required maintenance is usually more expensive because the motor is more complex. If you have an engine failure, you’ll likely need to change more parts.
A 4-stroke bike can work on regular low-octane gas, even the 87-octane you get at your local gas station. Still, if you want to ensure you’re giving your bike the best fuel possible, go for a racing fuel, like the VP Small Engine 4-Cycle Fuel.
What Kind of Gas Do You Put in a 4-Stroke Dirt Bike?
A 4-stroke dirt bike can take most non-ethanol based fuels, usually even below 90 octanes. However, you’ll have a smoother ride with a higher octane rating. If you want to improve your rides, try race fuels or octane boosters. They’re more expensive, but you’ll get a smooth ride and more horsepower.
With a 2-cycle engine, always go for a high-octane fuel for the best riding experience. In a 2-stroke engine, the lower octanes will make the fuel detonate instead of burning smoothly, which will give you more knocking and pinging.
2-stroke bikes are cheaper to fix and maintain than 4-stroke bikes, but they need extra lubrication together with the gas. Never ride a 2-stroke bike without adding oil because this will damage the motor.
The best 2-stroke oils for dirt bikes are specifically designed for racing bikes. You can use oils made for other 2-stroke equipment and tools, but the top options are bike-specific.
Also, remember that the oil needs to be replaced every 3 to 5 hours of riding. Old, burnt-up oil simply won’t lubricate enough and will fill your motor with debris.
For application, either pour the oil in on its own or premix it with fuel. The correct use and ratio depend on the model, so if you’re unsure, check your bike’s user manual or contact the manufacturer.
When you mix oil with fuel, remember to do it on the day you’re using the bike to prevent the oil from separating. For the best results, pour the oil into a jug first, then the fuel, and mix it before you pour it into the bike.
What Happens If You Put Regular Gas in a 2-Stroke Dirt Bike?
If you put gas mixed with 2-stroke oil, it should be okay, apart from some pinging or knocking if it’s low-octane. If you only put regular gas without oil, you’ll soon run into problems. 2-stroke engines need lubrication, and without it, they’ll heat and stop working. If you don’t want to be left without a bike, don’t try this at home.
Do You Really Need Racing Fuel?
Many motocross bikers go for racing-specific fuels, and they’re usually very high quality and will make your bike run smoothly. However, they also cost more. If you don’t have the skills necessary to get everything out of your bike, you may not see the difference.
The Best Fuels for Your Dirt Bike
These are the options for the best gas for dirt bikes, from 4-stroke fuel to racing concentrates and octane boosters.
You may not get high-octane gas in your area but don’t want the noise and discomfort of a low-octane fuel. For those moments, it’s good to have an octane booster or concentrate at hand.
This Race Gas Fuel Concentrate is designed for such situations. Just mix it with your fuel to give it a boost, bringing the octanes higher and giving you a smooth burn.
This concentrate is suitable for cars, motorcycles, dirt bikes, ATVs and other offroad vehicles. It also goes will all types of 2-stroke oils, so you don’t have to worry about compatibility.
The negative of this product is its high price, but you’ll only use it as an addition to mix with your regular fuel. Also, be careful to shake before use because it can separate, but don’t spill it anywhere because it might ruin paint permanently.
- Supercharged concentrate to boost octanes.
- Good option for when you don’t have quality gas nearby.
- Specially made for offroad vehicles.
- Compatible with 2-stroke oils.
- If you spill it, the concentrate may destroy your paint.
- Expensive option.
This fuel from the bestselling racing brand VP Racing Fuels works on small 4-stroke engines. Use it on anything from bikes to lawnmowers and leaf blowers to ATVs, but note that it’s not racing-specific.
The fuel is 94 octanes and designed to keep carburetors and fuel injection systems running smoothly. It’s a good product from a well-known manufacturer for those looking to go higher octane but don’t want to pay for a top-level racing gas.
This fuel has a long shelf life, so it’s a good option for those who don’t take their bike out every weekend.
It also doesn’t contain ethanol, so it doesn’t attract moisture or form gummy deposits in your carburetor.
It’s pricier than your regular gas station fuel, but it will prevent corrosion better thanks to the non-ethanol mix.
- 94-octane fuel.
- Suitable for all types of small 4-stroke engines.
- Non-ethanol mix prevents corrosion.
- Long shelf life.
- Not racing-specific.
This VP Racing Fuels octane booster increases fuel octane by up to 8 ratings and eliminates the knocking and pinging from low-octane fuels. It also helps you accelerate faster and gives you more horsepower on your ride.
It’s a racing concentrate and was specifically designed for offroad races, so it’s perfect for dirt bikes. Even so, it can leave residue in some motors, so make sure you control the situation and perform the necessary maintenance.
The 32-ounce bottle is pricey, but it can treat up to 10 gallons of fuel. The octane booster isn’t magic, though, but you’ll get better results if you buy a high-octane gas to blend with it.
- Effectively boosts low-octane fuels.
- Made for offroad racing.
- Good value.
- May leave residue in your engine.
This ethanol-free premix of oil and fuel prevents corrosion and deposits forming in your carburetors. It’s a great option for 2-stroke bikes that require a premix instead of pouring oil directly into the bike, though you shouldn’t use it in a 4-stroke or bikes that have separate oil tanks.
The 94-octane fuel runs clean without leaving deposits, and it uses a high-quality synthetic oil at a ratio of 50:1. Not all bikes will run well with this ratio, so make sure it’s the right one for your bike before purchasing.
This product is handy because it keeps your engine lubricated without having to measure and mix before pouring. Also, being a tin can, you can store it for up to two years after opening.
Note that since it’s not a racing-specific gas, it’s not the most high-performance fuel on the market.
- Burns clean.
- Ready-to-pour premix for 2-stroke motors.
- 94-octane fuel.
- Synthetic, high-quality oil.
- Works on all types of small 2-cycle engines.
- Only for engines that require a premix.
- Not racing-specific.
This Klotz 100 high-octane race gas is actually 94 octanes in your motor, which works well on dirt bikes. It gives you a steady burn without being too high to accelerate properly. Also, the fuel has a low lead content, which is better for your health and the environment, and burns clean without smell.
This gas is ethanol-free and works on both 2-stroke and 4-stroke dirt bikes. Just remember to mix it with oil for a 2-stroke engine to keep the motor lubricated.
This Klotz option is made for top-level racers and has the price tag to match. It can be a steep investment, so you’ll probably want to reserve this gas for race days instead of practice.
- Works on 2-stroke and 4-stroke engines.
- Top-level fuel for excellent racing power.
- Doesn’t leave deposits in your engine.
- Very steep price.
The best gas for dirt bikes is the RaceGas Race Fuel Concentrate. It’s not strictly a fuel but a booster you mix with your regular gas to up the octanes and your ride’s power.
It’s pricey per gallon, but you won’t require as much of it. Another bonus is that you can convert nearly any normal gas station fuel into a racing fuel with this, which is handy when you can’t find high-octane gas nearby.
Switching to a racing fuel can make all the difference if you’ve been relying on normal fuels. A high-quality fuel without ethanol won’t form a gummy residue in your engine, which you’ll notice more if you’ve been riding with gas station oils.