Whatever oil you use it is important to use a low ash oil in those engines to extent exhaust valve life. Diesel oils generally have a high ash content because the ash is used to neutralize the acids formed in the crankcase by the sulfur residue from the fuel. On the 656 gasoline engine the high ash oils will leave carbon residue on the valve stems that will cause them so stick open when the tractor is put under load. When that happens it will burn out the valve just like using a cutting torch on it.
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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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