What Should You Know About Oil Mixing on 2-Stroke Trial Bikes?

Getting the percentage of the oil-in-fuel mixture of a trial bike with a two-stroke engine right is essential. There are risks to the mechanics and their performance, whether there is an imbalance of the oil mixture due to both excess and defect.

The function of the oil in the mixture is to maintain the correct lubrication of the entire thermodynamic assembly, allowing, among other things, the correct sliding of the piston inside the cylinder. The lack of this lubrication is one of the reasons why the dreaded engine seizure can occur, therefore, it is essential to monitor the following aspects:

– The gasoline where the 2-stroke oil is going to be mixed can be both 95 octane and 98 octane, and even higher for competition engines.

– The blending oil used for trial and enduro bikes is recommended to be a 100% synthetic oil.

– It is always necessary to mix the drum where the mixture is made well, it is not advisable to mix directly on the gasoline tank itself, since due to the differences in density between the two components, being oil is denser than gasoline, it will tend to remain in the lower part of the tank and there could be a risk of seizure as it is not a uniform mixture.

What percentage of 2-stroke oil mixture is a trial bike?

Using a good synthetic two-stroke oil, the percentage of oil mixture in the gasoline for a trial bike is between 1% and 1.2%.

In case of using the trial bike for excursions or long distances, where the engine is constantly working at higher revs, we will increase this percentage of the mixture to 1.5%.

What is the risk of putting an excessive percentage of oil mixture on a trial bike?

Many times users prefer to mix in a percentage of excess, above 2%, as a way of preventing seizure, without taking into account possible consequences that can be generated in the medium and long term in the engine.

The main consequence is the accumulation of carbon in the exhaust system. It is an excess of unburned oil that ends up consolidating in the different sections, reducing performance and generating instability in long-term performance. We will see, for example, how the fibers of the exhaust itself end up getting soaked and generating a different sound from the engine. It can also grease the spark plug and cause ignition problems.

Considering that the torque of a trial bike is reached at 3,000 rpm and does not usually work above 7,000 rpm, a 1% mixture is enough if we use a quality synthetic oil.

What percentage of oil mixture does a trial bike have on the road?

For a trial bike on the road , the recommendation is to mix 2% oil in the first tank, in order to help with the initial lubrication of all the components of thermodynamics, which must settle in their first hours of work.

Between the second and fourth fuel tanks we will lower the oil mixture to 1.5% and from the fifth tank we can set the percentage of oil mixture between the recommended 1.2% and 1%.

These cases apply to carburetion-powered motorcycles, which as of the date of this article are the Beta EVO, GASGAS TXT, TRRS or the Sherco and Scorpa until 2022.

Motul 800 Oil with Precision Mixer

What exceptions do we find in the 2-stroke oil mixture on trial bikes?

The oil mixture recommendation for trial bikes has an exception, in the case of trial bikes powered by electronic injection, in which case it will never exceed 1% oil mixture percentage.

What percentage of oil blend does the Vertigo Nitro and Vertigo Vertical have?

Both the Vertigo Nitro and the Vertigo Vertical, powered by electronic injection, have a 0.6% oil mixture as recommended by the manufacturer Vertigo Motors.

In this brand it is especially important not to exceed this percentage, as it causes direct problems on the spark plug, the operation of the start and the performance of the bike.

What percentage of oil mixture do the injection Sherco STR and Scorpa SCT have?

Both the Sherco STR and the Scorpa SCT from 2023 onwards, powered by electronic injection, have a 1% oil mixture as recommended by the manufacturer Sherco Motorcycles.

What is the best 2-stroke blend oil for trial bikes?

The best 2-stroke oils for trial and offroad are Motul 800, Motul 710, Nils 2T, Sil Moto HRC, Repsol 2T Racing and Rock Oil Trial. The latter is trial-specific and leaves a very special strawberry aroma. We have tested all these oils at the Trialworld Store and they have successfully exceeded our expectations.


1.- Use a precision mixing meter like this Polisport oil mixer.

2.- Do not mix large capacities. If the use is going to be for a single motorcycle, it is preferable to make a mixture for a 5-liter drum and that lasts two weeks, than to make mixtures of 10 or 20 liters and that we have it waiting for months to be used.

3.- Always shake the drum before pouring the gasoline into the gas tank.

4.- In your backpack, you can always carry a small bottle, such as the Polisport mixer, in case you need to refuel during a route at the gas station, thus avoiding using a different oil than usual or others of inferior quality.


At Trialworld Store there is a workshop specialising in trial bikes in Madrid, with the possibility of home delivery and collection throughout Spain. Contact for an appointment request at Triaworld.

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