Never overlook the distibutor itself, worn bushing, and or worn or incorrect advance. Worn or loose reduction drive gear on distributor. Ideally the spark should occur near tdc at low idle and advance gradually as you speed engine and be fully advanced at rated engine speed of 1450 rpm. Total degree of advance will depend on head, pistons etc it is equipped with, like 22 degrees with fire crater or 30 degrees with flat head aluminum thin wall sleeves and or as much as 40 degrees if it has original size bore. All gas heads figured. Also the spark should not flutter back and forth more than a couple degrees when watching it with a timing light. Excessive camshaft end play can also make spark jump around along with worn gears etc. Some of these old h's still have distillate or kerosene heads on them and comp ratios are so low they run rough on modern fuels.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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