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UNITED STATESOIL per 1 U.S. GALLON Gasoline
*INTERNATIONALOIL per 1 IMPERIAL GALLON Gasoline
*INTERNATIONALOIL per 1 LITER Gasoline
Two cycle engines run on a mixture of gasoline and oil. Each engine type is designed to run on a specific gas-to-oil mix ratio.
IMPORTANT: Use only oil that is labeled for use in "Two-cycle" or "Two-stroke" engines. Home Depot and other stores now have "premixed fuel" of gas and 2 cycle oil.
To mix two-cycle fuel, start by putting correct amount of oil in gas can. Then slowly add correct amount of gasoline. Do not try to mix gas and oil directly in gas tank of equipment.
IMPORTANT: Do not use any fuel that is over 30 days old. Do not mix more fuel than you are likely to use in a month. Old fuel can gum carburetors and prevent starting. Always use fresh fuel.
The chart below shows correct amount of oil per gallon that each mixing ratio requires. Expect that yours will be between 32 gas to1 oil and 50 to 1. 32:1 and 50:1 are most popular. RatioGAS:OILUNITED STATESOIL per 1 U.S. GALLON Gasoline
(128 oz.)*INTERNATIONALOIL per 1 IMPERIAL GALLON Gasoline
(160 oz.)*INTERNATIONALOIL per 1 LITER Gasoline
"Black" exhaust smoke means unburned fuel, meaning one or more fuel injector is not properly atomizing the fuel. The fuel injector sprays a fine mist into combustion chamber. When fuel injector is clogged or has deposit build up on the tip, the fuel dribbles into large droplets instead of a fine mist, which results in poor combustion and black exhaust smoke. After you replace the faulty fuel injector, ALWAYS pour one bottle of "fuel injector cleaner" once a month when topping off your fuel tank. Normally, a bottle of fuel injector will treat 20 gallons, but it doesn't hurt fuel injectors if you mix with less than 20 gallons to increase cleaning solvent concentration to keep fuel injector nozzles clean.
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From Poulan website:
The fuel-oil mixture ratio for all Poulan two-cycle products is 40:1.
You can obtain this ratio by mixing 3.2 oz. of oil with one gallon of
regular gas. If you have other brands of equipment that require
ratios and you don't want to mix separate fuel cans, you should use the
lowest numerical ratio. For example, if you have products requiring
40:1, 50:1, and 32:1 ratios you should use the 32:1 ratio for all
products. This may cause slight smoke increase in the exhaust in the
40:1 and 50:1 products due to more oil in the fuel, but it won't damage
either of the engines.
You don't state how old your unit is. Most of the older units use 40:1 (3.2 oz. oil /gallon of gas or 1.6 oz oil/half-gallon gas). Newer models have tighter tolerances built into the carburetors (per EPA Emissions Standards) and are made to run 50:1 (2.5 oz oil/gallon of gas or 1.3 oz oil/half-gallon gas).
To be safe, I would run the 40:1 mix and use a synthetic 2 stroke oil or at least a blend. If it calls for 50:1 and you use 40:1, the extra lubrication won't hurt a thing.
The ratio is 1:25 so for every 25 parts of gas you use 1 part of 2 cycle oil. Any brand is fine but it must be for 2 cycle engines. Whatever measuring device you want is fine. Usually start by finding your oil container and your gas container. The 2 cycle can come in many sizes but 6,8,16 ounces is very common. An 8 oz bottle of 2 cycle will combine with 1.56 gallons because each gallon is 128 ozs and 8x25 = 200 ounces of gas or 1.56 gallons.
Of course measuring in metric is much easier.
I pour a little gas in a container add the oil and then finish off the gas to the correct amount. This mixes the oil and gas just fine and then with a black markery write on the container that it is mixed 1:25 that way you dont accidentally use it the wrong engine.
Check the fuel/oil mix ratio you are using. Some Ryobis use a 32:1 mix and some use a 40:1 mix. There isn't much difference there. To be on the safe side, if you machine is possibly running or tuned a little "lean" I would start off with about 4 oz/gallon oil to gas mix. Use synthetic 2-stroke oil also. Your machine will perform much better.
Probably too much oil added to the gas. At 40:1 that is only 3.2 Oz per gallon of gas. Smoking isn't completely a bad thing, at least you're getting lubrication to the engine (though it may be a bit too much). Remove the muffler, clean it. (throwing it in a fire and burning the carbon out is the most elementary way... on a grill... propane torch etc..and mix up a fresh batch of gas/oil (recommend synthetic) at the specified rate. The carburetors are very temperamental and the wrong fuel mix does this...tighten all carb screws you can unless you are going to pull it and rebuild it with new gaskets, etc (this can be done). Ethanol in gas ruins carburetor gaskets etc. over time.