If it runs 20-30 minutes before the problem occurs...
That sounds like either the tank is developing a vacuum, as in the cap is not vented or the vent is clogged.
Or it is vapor locking due to the fuel line to close to exhaust heat. Look the line over, move it as far from the manifold as practical, wrap with insulation or install heat shields. If it has a copper line, replace it with steel, it is less heat conductive. Also check the point gap, the centrifugal advance, the initial timing. Retarded ignition timing causes higher exhaust manifold temps.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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