ethanol is very bad stuff. i work on ATVs (3&4 wheelers) on the side and the carburetors are a constant battle trying to keep them in good running order. if it sits over the winter you can bet the gas in the carburetor is bad and likely starting to form deposits. the smaller the quantity of gas the faster it will go bad. we need to start our cars at least every 2 weeks in the winter to keep fresher gas in the carburetors. stabil helps but not that much.