Adrian, I know it is your story and you can stick to it, but I am here to tell you what causes a gas engine to diesel has ZERO.. I mean ZERO to do with the ignition. The only very minor part it may play in it is if you have the timing off so far or something like this that would cause the actual engine temperature to get much higher than normal. This is because when you turn the ignition off the spark STOPS, end of story! NO more effects from spark in the cylinders. The number one cause of dieseling is the idle is set to high so the throttle plate is not closed enough. So namely to much AIR which is mixed with fuel is being let in the intake manifold. This is usually compounded by carbon deposits built up in the cylinders. They get red hot while the engine is running and then when you shut off the spark the hot carbon continues to light off the air/fuel mix in the cylinders. Unless you have a super duper hop up job on your Super A if the idle is set slow enough it should have very little tendency to diesel due to the compression is not that high. Now the higher compression 264 and 301 six cylinders had this inherent problem. For this reason IH equipped them with solenoids that closed the main fuel circuit of the carb when the ignition was shut off.
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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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