If high octane fuel made engines start easier, they wouldn't use 87 octane pump fuel in the squirt can to start 10,000hp funny car drag engines. I would theorize that, depending on your stock compression ratio, it may not start at all on higher octane fuel. These old tractors were built to burn spotty octane, low quality fuel by today's standards. My Super 55 manual states it is a "modern high compression engine and requires minimum of 86 octane fuel". I believe it is 7 to 1 on it that they call high compression.
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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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