southpennrailroad wrote:
Here is my assist motor on my bike. It still isn't working as I need to find out the ratio of 25:1 oil. What does this mean?
Instructions read: The ratio is 16-18 parts gasoline to 1 part oil. After the break-in period, the ration can be increased to 25 parts gasoline to 1 part oil
Very cool!
I assume this is a two-stroke engine, which is usually lubricated by oil mixed with the fuel, rather than using a separate oil reservoir.
The ratios mean that when you mix the oil with the gas, you use 16-18 parts (ounces, cups, quarts, whatever) of gas and mix in one part (the same--ounce, cup, quarts, whatever) of oil. A gallon is 128 ounces, so for every gallon of gas, you'd use 7-8 ounces of oil, or about a cupful during the break-in period.
Once your engine is broken in, you can decrease the oil to about 5 ounces per gallon of gas, or about 2/3 cup.
David