I don't remember ever working on small engine carburetors while helping out my grandfathers with various repairs as a kid. and we had some tired old machines. When ethanol arrived in our fuel supply, it was rebuilding carbs every year, and sometimes even in the summer after using the lawnmower for a while. Chainsaws died, weed eaters died, lawn mowers died. I put only ethanol free gas in for a number of years, and have done zero carb work since, other than occasionally re-tuning 2 strokes due to changes in the weather. I work with a dude sometimes who isn't so careful with the gas, and always make a point of bringing my own gas can for my equipment. I've kept the ethanol free for over a year with no problems... put it in the tank and it starts up every time.