After you run a gallon or so through it take the backing plate off the engine and look inside. I ran 4 or 5 gallons of Sidewinder before changing to Byron and personally will never go back to Sidewinder. There are only 2 brands of fuel I am pleased with out of the many I have tried Byron and O’Donnell. Matter of fact I have all most a gallon of Sidewinder Worlds 30% is someone comes by I will give it to them.