5 gallons is fine if you only run that... I.E. mix 6.4 oz. of oil with 5 gallons of gas (100:1) and shake well. Then pour it into the tank, but don't add any other fuel to the tank and ride the sled but very your speed, don't sit at any RPM for more then a few seconds. Once you run almost all the fuel out, fill the tank and go nuts.
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