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Experienced gardeners share their insights in answering this question :
No — 2 strokes use a special 2 stroke oil ==not ordinary engine oil==
the difference is that the 2 stroke oil is specially blended to mix with petrol and will not block up the fine jets in the carby
it also “sticks ” more readily to the metal components in the engine thus preventing wear
as a point of interest most small engines do not like E mix fuels either
so for trouble free operation –2 stroke oil mixed in the correct ratio with either 89 or 91 octane petrol and it will start first pull every time
use the primer bulb sparingly or the choke until it fores

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Two-stroke (or 2-cycle) engines require a mixture of fuel and oil be added to the fuel tank. This mixture results in both engine combustion and lubrication. Operating a 2-Stroke engine on gasoline alone will result in engine failure.
What is the ratio for 2-stroke fuel mix? Most modern petrol garden machinery requires a 50:1 ratio mix of petrol to oil. This means for every 1 litre of petrol you must mix 20ml of oil.
Most modern chainsaws, string trimmers, leaf blowers and other small-engine two-stroke equipment recommend a 50:1 oil mix ratio, but some recommend 40:1 and older two-stroke equipment might even call for 32:1.
It`s highly recommended a fuel to oil ratio of 50:1 for most 2-stroke engines. This means that for every 50 parts of fuel, there should 1 part of oil.
What happens if the mixing ratios in a 2 stroke engine are incorrect? If you put too much oil, it can generate additional carbon build-up, making it difficult to start the engine, blow excessive smoke which is particularly bad for the environment and may (with time) cause the engine to stop operating correctly.
The presence of oil and its distribution is absolutely crucial to an engines continued operation. Engines can work without oil, but the effect is so damaging they are only capable of running for less than 30 minutes until failing – and in most cases, it`s a lot quicker than that.
For a mixing ratio of 1 : 50 you need 5 litres of high-octane gas and 0.10 litres (100 ml) of STIHL two-stroke oil.
We recommend a 50:1 mix ratio (20mls oil per 1 litre fuel) when using STIHL 2-Stroke oil. If you`re using a different brand of 2-Stroke oil, you`ll need to mix at 25:1 (40mls oil per 1 litre fuel).
1:25 = 1 part oil + 25 parts petrol, or 40 ml oil per litre of petrol when using other brands of oil. Any two-stroke engine oil you use in your petrol gardening tool must have the TC classification.
Mix 2-Stroke fuel in 3 easy steps

Step 1: You`ll need STIHL 2-Stroke oil, an empty and clean fuel can and fresh unleaded fuel from a reputable petrol station. Step 2: Mix at 50:1 (20mls oil per 1L fuel) when you`re using STIHL 2-Stroke oil. If you`re mixing a larger quantity, check out our useful mixing chart.

To prevent a costly mistake, always mix the specified 50:1 gasoline-to-oil ratio for the Ryobi SS30 lawn trimmer. This will make for a smooth day working in the yard.
Mix at 50:1 (20mls oil per 1 litre fuel) when you`re using STIHL 2-Stroke oil. To prolong the life of your 2-Stroke fuel mix you can add STIHL fuel stabiliser to extend the fuel`s shelf life up to 12 months. 15ml of STIHL fuel stabiliser will treat 5 litres of fuel.
Make sure you are using the correct fuel mixture with your chainsaw. Ryobi chainsaws run off a 50:1 ratio, this means 50 parts unleaded fuel to 1 part 2-stroke oil.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

How do I mix two stroke engine fuel
ANSWER : Put oil in your petrol can add the exact amount of petrol put the cap on shake well use and store out of sunlight

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What type of oil goes in the Ryobi 08570 Blower? What is the oil gas mix ratio?
ANSWER : You need 2 stroke motor oil or chain saw oil.Mix it according to the lable to make up 50:1 oil/gas mix.

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What oil ratio to petrol do I use?
ANSWER : 40:1 is the recommended ratio for this type of engine.

If you cannot measure accurately you should tend towards more oil rather than less. That will protect your engine and the only downside will be a slightly smokier exhaust and possible oiling of the plug over time.

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What is ment by 50 to 1 mix
ANSWER : 50 to one is a ratio of fuel to lubricating oil. Typically 50 parts petrol/gasoline to one part two stroke oil.

Oil typically comes in a special plastic bottle that incoporates a measure. Simply squeeze the right ammount of oil into the little chamber and add to 5 litres of gas.

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Im having trouble starting my 2 stroke chainsaw. I follow the instructions but it wont fire over it sounds like its just about to but wont.
ANSWER : Here is a Link to one of my Tips:http://www.fixya.com/support/r6081405-cleaning_small_engie_carburetorGood Luck!Jim

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What is the oil to gas mix ratio for ryobi tiller
ANSWER : Some of the new models are 4 cycle, hence you dont mix it.The 2 cycle models are all 50 to one of a good synthetic 2 stroke oil

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Do i put an oil/gas mixture in gas tank? – Yard Machines 158cc Push Lawn Mower #11a 034f200
ANSWER : The 4 stroke engine only needs petrol in its tank . if your motor has a dipstick for oil it is a four stroke ,,only two strokes requires oil and petrol mix as they have no oil sump in their design

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How much oil to gas mixture for ryobi 40 cc chain saw
ANSWER : Requires a mix of 50-1

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