Just picked up the old Stihl FS45 string trimmer from the shop. It was bogging down at high throttle settings and needed a tuneup. What caused the problem?
The culprit - ethanol gasoline!
I learned from the good folks at my tractor sales / repair shop that ethanol has a tendency to thicken as it absorbs any moisture! If you don't use your gas up quickly, it can clog fuel lines and carburetors in 2-cycle engines over time.
I don't burn that much gas in my trimmer. I use my scythe for the knotweed. I only use the string trimmer for occasional trimming. I mix a gallon of gas with oil, and use it over 2 years!
I know better now. I'll mix up only 1 quart at a time!
I still don't understand why we take perfectly good corn, convert it to ethanol, and then suffer with the drawbacks of it as a fuel!