Oil-Mix Guide for 2-stroke Dirt Bike

A proper mix ratio for a 2-stroke dirt bike is crucial. If you have never done it before, please check the manual first and follow the instructions carefully. There is a huge risk of mixing the wrong ratio.

But if you can’t find it in the manual, this guide should give your everything you need. Generally, the accepted ratio for an average two-stroke engine is 40:1, which translates from 125ml of recommended oil to 5 liters of recommended fuel.

2-stroke mixing oil

What is 2-Stroke fuel

Using a dirt bike requires that you understand proper maintenance procedures. And one of them is how to mix fuel and oil.

A two-stroke fuel means petrol mixed with accepted 2-stroke oil. Your engine’s instructions manual will have a specified ratio that will allow the optimum operation of the bike.

We can always emphasize the importance of oil in a 2-stroke fuel. It lubricates the engine since these bikes don’t come with an internal oil reservoir. That means the engine can be badly damaged without lubrication if you get the mixing ratio wrong.

Why do you need to use mixed oil for a 2-stroke dirt bike

As you may already know, a four-stroke bike engine uses straight, unleaded petrol, commonly known as gas. For the two-stroke engine, you must add oil to the fuel due to the following reasons:

  • The bike does not have an internal oil reservoir. Every engine requires lubrication, which comes from the oil. The lack of an oil tank in a 2-stroke dirt bike means it will be hard to lubricate.
  • Risk of reduced lifespan. Straight gas is the wrong fuel for its motor since it does not offer the required lubrication. It will significantly reduce the lifespan of your bike. It’s.
  • The wrong fuel will damage the piston and cylinders. Missing the 2-stroke fuel means you are forcing the engine to run without correct lubrication, which will damage the internal engine components.
  • Expensive to replace the parts. You will need a complete engine rebuild if the internal components are damaged due to lack of or the wrong oil-fuel mixture.

You can avoid all these issues by just getting the right mix of oil and fuel. It does not take time and does not require rocket science calculations.

Examples of Oil-to-Gas Ratios for Various Bikes

Different engines may require different ratios. As stated above, you must check the owner’s manual for the recommended proportions. If you are unsure, keep it 40:1, which is a middle range. You can measure it using 25ml of two-stroke oil to one liter of petrol.

Here are examples:

  • FRP DB001– 25:1. Ensure you check the instructions for preparation before star from the manual instructions.
  • KTM 50 SX - 60:1. This also works for the mini.
  • YZ 250 – 32:1.

Refrain from assuming that your engine can use the same ratio even if they have the same engine capacity. You can ask your dealer or local engine specialist for guidance where you need more clarification.

What is a 25:1 mix

It’s important to calculate the oil-fuel ratio for dirt bikes. One of the most common ratios is 25:1, which is quite easy to calculate. The ratio means for every 25 parts of units of gas, you will need 1 part of the oil. It also means 40 MLS of oil per liter of gas. It can also be represented as 5.12 oz per gallon.

What kind of fuel/ratio do you need

You can easily mix two-stroke fuel by looking at the engine specification. And that is why we are insisting that you read the user manual carefully to find the right combination.

The mix ratio depends on the equipment, its year of manufacture, and its brand. It must be as accurate as possible because too much or too little will adversely affect the engine performance.

Refer to this table

Mixing Ratio (Gas:Oil)

Volume of Gasoline

Volume of 2-Cycle Oil


1 US gal. (128 oz)

5 oz.


1 US gal. (128 oz)

4 oz.


1 US gal. (128 oz)

3.2 oz. 


1 US gal. (128 oz)

2.6 oz.


1 liter

40 ml


1 liter

31.25 ml


1 liter

25 ml


1 liter

20 ml

Fuel Ratio for A 2-Stroke Dirt Bike: How To Make The Mix-Oil

Calculating the components of a 2-stroke dirt-bike fuels it quite easily. You can use several online calculators to make your work much easier. But if that is not an option, follow these steps:

Step 1: Know your engine

You should already know your bike’s model, and the year it was made. Figure out the correct ratio from your user manual or by checking the table above.

Step 2: Get the right jerrycan

There are many fuel-mixing gas measuring bottle on the market today, you may easily find them online on Amazon. For all FRP 2-stroke products, they all come with the measuring bottle in the package.

Step 3: Find good unleaded petrol

The last thing you want to using adulterated fuel. You need reliable fuel that should have at most 10% ethanol. This is because ethanol attracts moisture, which can change its property.

Repair a leaking gasket as soon as possible to avoid expensive repairs. It all comes down to taking good care of your engine.

Step 4: Choose a good 2-stroke cycle oil

Effective 2 -stroke oil that is 100% synthetic and recommended for everyday use. Such oil promises clean burning and reduces carbon deposits.  

Refined oil increases performance and the engine’s life. It gives smokeless burn, and hence, less fuel consumption.

Mineral oils are the cheapest options as they come from natural petroleum. They will work well, but they need to be cleaner and will easily leave build-up in the engine.

Step 5: Mix them

Measure the correct amount of 2-stroke oil and pour inside the fuel in the can and shake vigorously. Pour the 2-stroke fuel into the fuel tank and enjoy your ride. The process is straightforward as long as you have the correct mix.


Proper maintenance is required for two-stroke mini bikes. Lubrication is among the most important aspects of this process, which is why the fuel-oil ratio is crucial. As you can see, it’s quite easy and it keeps your engine safe to run for a long time.

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