Gas to oil ratio is a function of the oil you are using. Mix according to what the oil says not what the manufacturer of the engine says. Those ratios could/may be the same. IF you mix 16:1 oil (do they even sell that anymore ?) at a 50:1 ratio it will destroy the engine. There will be no problems at 16:1 as the oil recommends.
I have used 100:1 Optimoil (?) when I can find it instead of the recommended 48:1 of my 2cycle. No problems.
Mix the oil in ratio the oil manufacturer says to mix.
SOURCE: What is the gas and oil mixture ratio?
Hi, McCulloch chain saws have different mixtures depending on whether you use their brand or generic and is also dependent on the model. The three mixes are 32:1, 40:1 or 50:1. If you are unsure, use the 40:1 and watch the smoke, too much smoke use less mix, but don't run with too little. If you see any coming from the exhaust it is too much and can't burn it all. Good Luck, hope this Fixsya!
SOURCE: need oil gas mixture for homelite HB 100 blower
50:1 with premium oil i.e. Echo, Stihl, Husqvarna.
40:1 with Homelite or generic brands
SOURCE: Gas Oil Mixture
Fuel Mix: Add 6 oz. McCulloch custom lubricant or 1 PT. S.A.E. 40 (16:1) to 2 U.S. Gal. Regular Gas
SOURCE: oil and gas mixture
Mixture is typically 40 or 50 to 1, gas to oil. The exact mix should be stamped on the gas cap.
Check your manual for the proper gas-and-oil mixture. For almost all modern two-stroke engines, a 50-to-1 mixture is recommended. That requires about 2 1/2 oz. oil for every gallon of gasoline.
Use only two-cycle oil for your mixture. This oil is made especially for these engines and can be purchased at gas stations, hardware stores or any other place where you buy regular motor oil.
Pour the proper amounts of gas and oil into a fuel can. Shake the can well to mix it.
Label your gas can with the mixture ratio. You can use the same mixture for other two-stroke engines.
Shake your fuel can thoroughly every time you refuel. After a while, the oil will settle out of the gas, and shaking it up ensures that the oil and gas are properly mixed again before you put the fuel into your chainsaw.
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