Look in the owners manual to see what the correct ratio of fuel to oil must be. It will usually have a ratio of 50:1. This number needs to be divided by the size of the fuel tank, which will also be listed in the manual. Take the tank size and divide it by the first number in your ratio. For example, a 9.25 ounce fuel tank will need 0.18 oz. of oil. The remaining 9 oz. (rounded for good measure) need to be a half-and-half mixture of nitro fuel and gasoline.
Set the bucket on a cement floor in a well-ventilated location. You will use this to concoct the fuel mixture for your chainsaw or weed eater.
Measure out the oil first using the turkey baster. Squirt 0.18 oz. of the synthethic oil into the bottom of the bucket. Follow this with 4.5 oz. of nitro fuel and 4.5 oz. of gasoline. Mix carefully with a wooden paint stirrer until fully blended. Pour the mixture carefully into the fuel tank of your device.