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This is a classic problem of the starter-motor armature dragging against the field due to overheating. Shielding that provides an air gap between the starter motor of at least 1/2 inch and the heat source is the most economical and effective solution to this problem.
Either buy a heat shield or fabricate one from thin aluminum or steel sheet. Provide a mounting tab to install under one of the starter mounting bolts at the gear end. At the other end, make a tab that will attach to one of the small long bolts at the brush end of the starter or a standoff that can be secured to the starter housing with a large hose clamp.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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