What is the gas oil mix for jonsered 621 chain saw?

The Jonsered 621 chainsaw typically requires a gas-oil mix of 50:1, which means 50 parts gasoline to 1 part two-stroke engine oil. For example, you would mix 2.6 ounces of oil with 1 gallon of gasoline. Always use high-quality two-stroke oil and check the owner's manual for any specific recommendations.