The recommended ratio for mixing gas and oil in a Yamaha Banshee 350 is 32:1. This means that for every 32 parts of gasoline, you should add 1 part of oil.
To mix gas and oil, you can use a measuring cup or a graduated cylinder. First, measure out the desired amount of gasoline and pour it into a container. Then, measure out the desired amount of oil and add it to the gasoline. Mix the gas and oil thoroughly by shaking the container or stirring it with a stick.
Once the gas and oil are mixed, you can add it to the fuel tank of your Banshee 350. Be sure to use fresh gas and oil, and do not mix old gas and oil with new gas and oil.
It is important to note that the Banshee 350 is a two-stroke engine, which means that it does not have an oil filter. This means that the oil in the fuel tank will eventually become dirty and need to be replaced. You should change the oil in the fuel tank every 100 hours of operation or once a year, whichever comes first.