Premix Ratios For 2 Stroke Dirt Bike Oil [Including Charts]

David Welch
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Premix Ratio Chart (Per 5L of Fuel)

Main: 21%

Max: 24%

The above image is a premix ratio chart for 2-stroke dirt bike oil. This chart details how much oil to add per 5L of gas, such as Motul 710 2T.

Premix Ratio Chart (Per 1 U.S Gallon)

Just mix 1~2 oz. or 17 mL~34mL of our premix per U.S. gallon of gas.

However, if your bike is vintage or has been run extremely hard for extended periods of time, it may be helpful to run 60 mL (2 oz.) to 120 mL (4 oz.) of premix per gallon of gas, even at the beginning of the season.

If you have no way of testing your premix, most folks would suggest using 10 to 20% of the gas tank to mix and then top off with premix. In other words, mix 10 to 20% of the volume of your gas tank with premix per 10 to 20 gallons of gas.

How To Premix 2 Stroke Gas For Dirt Bikes

Mixing 2stroke gas is pretty easy actually and your local small engines stores can certainly do it for you on the spot. Just pointing out a few things to make the process smoother.

First make sure the engine is cold so if you plan to do inside make sure the lid on your gas can is really tight and you line the can with a paper towel to keep fumes from leaking out.

Put the gas can on a heat resistant surface….couple bricks work well.

Put the Funnel in the Gas Can (You May Want to Have Tool to Help You Move the Funnel up and Down)

Squeeze in just a little gas at a time, follow the directions on your premixed gas can.

Use a zip type sealable freezer bag to hold the paper towels.

Make sure to run your engine after your done mixing so you burn off any excess fumes.

There you go. After mixing your gas you are ready to ride. If you have any questions ask the expert at a small engine store.

What You’ll Need

In order to get a good mix, you’ll need to get a good sense of how much oil you need for your dirt bike, which depends on how many hours you’ve used the bike last time you went on out riding. The oil you need for the engine will be based on the ratio that fits between your bike and the oil container.

Before getting started, you’ll want to get an oil cheater and an oil funnel. This will make it easier for you to pour in the oil into the engine, which is usually hard to reach the spot if you don’t have those.

You’ll also need a measuring tool to measure the amount of oil you need in specific ratio. 1 ml = 1 cc or the same level of measurement. The measuring tool can be obtained from your local hardware shop.

There’s a lot of different types of motorcycle oils that you can use. If you aren’t sure which number of the chart to use for your bike, you’ll want to do some research beforehand. Luckily, this article contains charts for several different ratios.

How To Premix Dirt Bike Fuel

One of the most common questions that I’m asked by our customers is “What’s the best way to premix my dirt bike fuel?”

Well, we’ve got the answer for you below.

The best way to premix your fuel is to mix the correct ratio of two stroke oil into the gas BEFORE you purchase it.

If the gas station doesn’t have fuel premixed, for whatever reason, you can still add the oil yourself.

To do so, you’ll want to mix your oil at a ratio that is 80:1. This means that for every ounce of gas that you’re going to put in the tank, you’ll want to add at least one ounce of 2 stroke oil.

Each oil manufacturer will have their own recommendations on how much oil to put in, but the bottom line is that if you’re not using a premixed gas already, you’ll want to at least be prepared by carrying extra 2 stroke oil with you.

Here’s a chart with the right ratio of oil added to Gasoline.

Mikuni Hi-Performance 20:1

Final Notes

Please note that this relates a reasonably up-to-date combination of ratio and volume. While you may find old guides online that still recommend different combinations… be aware that these aren't correct. Use the following as a guideline, and measure in your own tank for the proper portion. There's a lot of information on the internet, but be aware that users without correct testing equipment are probably utilizing a non-optimal ratio!

Some 2 strokes have a tendency to flood on startup, causing a piston jam that can be particularly frustrating. It is easiest to prevent this by adding a little extra to your oil tank. That gives the motor a margin of error if you happen to pour in a bit of new 2 stroke oil at the same time, or forget to drain your tank first.

In the event that you do flood the motor on startup, open up the petcock (siphon) and let an inch or so of the gas dribble out.

Start the motor again, and once it warms up, it will probably start right up.

With the motor running, you can top off the tank with the correct ratio, and move on with your life.