How to Mix 2 Stroke Fuel: 2 Stroke Mix Calculator and Instructions
It’s important to know the correct 2 stroke mix ratio for your engine. The first thing you need to do is check the manual that came with your machine. It should tell you the correct ratio required for your 2-stroke mix.
If you can’t find the specific ratio for your mix, 40:1 is accepted as an average ratio for two-stroke engines. This is 125mls of two stroke oil to 5L of fuel.
2 Stroke Mix Calculator
Got another ratio and need to work out how much oil to add? Then just enter your ratio and oil amounts in our 2 stroke fuel calculator below.
400 milliliters of oil for 2 liters of gas at 5:1
What Machines use 2 Stroke Engines?
Even though most cars and motorcycles have four-stroke motors, there are still a few bikes with two-stroke engines (also known as two-cycle engines) .
Also plenty of other machines use two-stroke engines — like model aeroplanes, chainsaws, mowers, leaf blowers, string trimmers, construction machinery, and snowmobiles.
What is 2 stroke fuel?
Two stroke fuel is basically unleaded petrol mixed with 2 stroke oil. The oil to fuel mix ratio should be specified in your engines instruction manual.
The oil in 2 stroke fuel is extremely important in lubricating your engine as two stroke engines do not have an internal oil reservoir. Without the oil, you risk destroying your engine.
Why Shouldn’t You Put Straight Petrol into a Two Stroke Engine?
Four stroke petrol is straight unleaded petrol (known in the USA as Gas) will rapidly reduce the lifespan of your 2 stroke engine — and by a considerable amount. This is the wrong fuel for a 2 stroke motor, as it doesn’t provide the quality of lubrication that you need.
It almost goes without saying, by forcing an engine to run without the correct lubrication you are almost guaranteed in damaging the piston and cylinders.
Unfortunately, it’s hard to replace these parts and can be expensive, as its what you call an “engine rebuild”. This is easily preventable just by mixing the fuel and oil correctly.
What is the best 2 stroke ratio?
The precise 2 stroke oil ratio depends on your manufacturers instructions, as each engine can have varied requirements. If you are unsure 40:1 is a middle range 2 stroke fuel ratio. This equals 25mls of two stroke oil to 1 litre of petrol.
The two stroke mix ratio depends on the year your equipment was made, and/or the make of your equipment.
Your mix needs to be as accurate as possible, putting neither too much, or too little oil.
If you put too much, it may stop the engine, generate carbon buildup, and blow smoke which is particularly bad for the environment. But if you put in too little, it will (with time) damage your engine permanently and overheat.
Invest in a proper Fuel Can
Nowadays, there are different jerry cans available. Some are simple, and others are spill-proof. The better the can, the higher chance you have of creating an effective mix that isn’t corrupted by other factors.
They also come in different colours, and you should stick with the correct colour for your fuel type. A green jerry can is the standard colour for 2 stroke fuel, so there’s no risk of confusing which fuel type is in the container.
Red jerry cans are for unleaded petrol, yellow jerry cans are for diesel and water is in white / clear containers. This makes it easier to work out one from the other and prevents unfortunate and expensive mix-ups.
Another reason for the colour jerry can standard is that in the event of a fire, the fire brigade are more able to know what chemicals they are dealing with.
Find Reliable Unleaded Fuel
This part is vital.
You need to find and use a reliable unleaded fuel. There are specific things you need to look for. For instance, it should never comprise more than 10% ethanol. Why?
Well, when exposed to air, ethanol attracts moisture. And as you probably already know, when water mixes into an oil its properties change, so it no longer has the desired effect.
You’ll soon be forced to dip into your pockets to find that loose change! If you have a leaking head gasket, you must pay for a significant repair. That includes removing several parts, and many hours of labour.
This will be expensive. But, all of this is avoidable just by choosing the right fuel from the get-go.
Select a Good Oil
Depending on the use, try to find an oil that has a good composition and is low smoke. You can find options that are 100% synthetic and good to use every day. These help you have a clean-burning and reduce the carbon deposits.
If you’re picky, you can find an oil that is refined, that increases the life of your engine and works more smoothly. An oil like this will help you to get a high-class performance in your engine. Some oils give you a full smokeless burn. Therefore, you have smaller fuel consumption.
Mineral oils are a cheaper option because it comes from natural petroleum, and they work well. However, it is not as clean, and eventually, leave you buildups, and require more maintenance for the engine.
Did you know that 2 stroke oil is usually dyed blue or green. This makes it easy to tell if it has been added to your petrol (which is yellow). So if you are ever unsure if the fuel has been mixed yet- just tip some out to see what colour it is. If it is yellow it is likely straight petrol. And if it is a blue to green colour it is likely to be 2 stroke petrol.
Mixed fuel must be used within 30 days from the time it was mixed to ensure the fuel is stable and combustible
Added the oil to the petrol, what’s next?
After pouring the 2 stroke oil into the fuel in the can, shake vigorously, and pour the 2 stroke mix into your fuel tank. Avoid trying to mix the 2 stroke fuel directly inside your engine’s fuel tank. It is too hard to shake the mix thoroughly through and unnecessary effort.
Once you have the right oil and fuel, it’s a straightforward process and routine to follow.
You must take your time to know your engine and how it works. Remember to see the instructions and find the exact ratio to make your mix, or go by the standard.
Watch this video by Husqvarna for important safety tips when mixing 2 stroke fuel:
How to Mix 2 Stroke Fuel: Common Questions
2 stroke fuel is a mixture of petrol with 2 stroke oil at a predetermined ratio. Check your equipment to find the correct fuel mix ratio, and input the ratio in our 2 stroke fuel calculator to determine the quantity of oil to achieve the ratio. Two stroke fuel is also commonly called 2 stroke petrol, or 2 cycle fuel.
1. When making 2 stroke petrol, use a green jerry can to mix your fuel. This is the colour for two-stroke fuel storage and will prevent expensive accidents.
2. Use our 2 stroke fuel calculator and type in the two stroke fuel ratio you need to make and the number of litres of petrol you have.
3. The calculator will calculate the millilitres of 2 stroke oil you need.
4. Add 2 stroke oil to your petrol and shake it before adding it to your fuel tank.
You should follow the ratio provided by the manufacturer of your power tool. If do not know what it is, 40:1 is accepted as an standard ratio for two-stroke engines. This is 25mls of two stroke oil to 1L of petrol.
As two stroke engines do not have an internal oil chamber, you need to add 2 stroke oil to your petrol manually. If you do not, you are likely to damage your engine’s piston and cylinders. This can be an expensive rebuild. Use our 2 stroke mix calculator to calculate how much oil you need to add to look after your machine.
It is always best to check your warranty manual for the exact fuel mix ratio. Stihl recommends you use 50:1 (petrol:oil) when you are using their own brand of 2-Stroke oil.
Check your warranty manual for the correct 2 stroke oil ratio for your Husqvarna equipment. Husqvarna recommends a 2 stroke ratio of 50:1 (petrol:oil) for equipment up to 75cc. Use our 50 to 1 fuel mix calculator to work out how much oil you need to make a 50:1 two stroke ratio.
2 Stroke Mix Chart
If you like to have a chart to keep for future reference , this
2 stroke fuel mix chart from Husqvarna will help you calculate exactly how many parts fuel you need for every part oil.
Benefits of a 2 Stroke Engine
A two stroke engine is an internal combustion engine that completes a power cycle with a single upstroke and a downstroke. This is basically, just an upwards movement and a downwards movements of the piston during one single crankshaft revolution.
This is different from a 4 stroke engine which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions.
As two-stroke engines fire once every revolution, while four-stroke engines fire once every other revolution. This gives two-stroke engines a significant power boost.
Two-stroke engines are perfect for this type of machinery because they have a higher power-to-weight ratio than four-stroke motors.
Two-stroke engines can work in any orientation, which can be important in something like a chainsaw.
But, unfortunately, a two-stroke engine doesn’t have an internal oil reservoir. This means you need to know how to mix 2 stroke fuel correctly.
Do You Now Know How to Mix 2 Stroke Fuel?
Now that you know these essential things about how to mix 2 stroke fuel follow these easy steps and you will get the best from your bike, or other equipment.
Now you know how to mix two-stroke fuel, you can check out our store for our quality two stroke oil options.
Did you know that while we use the term “2 stroke” in Australia, it is “2 cycle” is used in other parts of the world.
If you enjoyed this article, check out our tips on small engine troubleshooting