fuel mixture


Old 08-18-02, 11:10 AM
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fuel mixture

I just recieved a old David Bradley chain saw, and am wondering what the mixture of 1/2 pint SAE 30 oil per gallon of gasoline would convert to in today's standards. Also what would be the recommened way to clean the gas tank and the carb.
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Old 08-18-02, 01:01 PM
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That's 16:1, pretty oily since most 2 cycle stuff nowdays runs 32 or 40:1. The straight weight 30 oil is likely to gum things up pretty badly, too. Probably want to disassemble the carb, but could be risky unless you can find a gasket set. Other way would be unscrew mixture and idle screws and spray some card cleaner in, also in the fuel inlet. Can probably clean tank with some carb cleaner also. Don't think you really want to run it on 30 wt oil. I would try some good 2 cycle oil instead at the same ratio.
Old 08-18-02, 05:52 PM
J A Boggan
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If you are interested, here is the formula for mixing 2 cycle into 1 gallon of gas:

128 divided by (the ratio) = number of ounces of oil per gallon of gas.

1 gallon = 128 ounces

For example: 40:1 ratio - 128 divided by 40 = 3.2 ounces of oil per gallon of gas.

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