One big no-no that I've figured out is DON'T use gas that has any ethanol in it. Ethanol attracts water, and gums up a bunch of stuff. Just say NO.
Agreed!!!
I have been doing that on my chainsaw, brushcutter, and other small engines for many years.
Most of the time (after being winterized) I just put in fresh gas and oil in the spring and they start on the second pull.
In fact, I am pretty sure that avoiding ethanol in gasoline has helped me NOT be a small engine repair guy!
