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It should tell you the ratio on the saw.
Fairly simple. Fuel line up from tank.....underneath carb.....to right side of carb inlet fitting.
50-1 ratio most definitely.
what is the fuel/oil mixture for a stil chainsaw model 1629
Try changing your fuel filter/lines. It could have had sucked something into the lines and cannot get any more fuel through.
50 to 1 on new ones. The old chain saws could have a ratio as much as 16 to 1.
show diagram of poulan chain fuel lines
Mix 1/2 pint (8oz.) for every gallon of gas. 16:1 Ratio
I recommend 40:1 with good quality oil.
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 different fuel/oil 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.
50 to 1 2.6 oz oil to 1 gal. gas
1/2 pint oil each gallon of gas.