The high octane level in premium is not needed. The Ethanol,,, how ever can and does cause problems. Ethanol carries moisture and the moisture is what causes most of the problem with the carbs. There can be corrosion and deposits in the float bowl due to moisture. There can be a gum deposit from the ethanol dissolving years of film off of the tank and that gum then hardens in the bowl and jet passages. The fuel can and does.... dry up and scab over jets and passages from the scum and gum in the fuel from the ethanol removing it from other places. And carb venturi design using particularly small passages will totally clog up from using ethanol fuels, again from the gum and scum scabbing over and stopping up the passages. Running the carbs dry with a cut off valve will MOSTLY stop this from happening on a lot of small engines. Engines with either solenoid loaded needle cutoffs or large jet design seem to tolerate the ethanol very well, so modern designs seem to do better. SO... you do not need high octane. You may or may not have problems with the gas drying up and causing flooding or a very lean run or a no run due to ethanol gas. Non ethanol fuel, if you can get it and afford it, will have less problems. Running the tractor often, will mean less problems as oppose to letting it sit for long periods and having more moisture and evap problems. Again, cutting off fuel and running carb dry before you put the tractor/chainsaw/welder/generator/weedeater/........ up, seems to solve/help this problem.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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