Sudden stop with good spark and some gunk in the sediment bowl: I would be looking for carb issues. If the priming lever is hard to move, the fuel pressure may be fine (note, I have an electric pump so am guessing here). Do you have an inline "polishing" filter between pump and carb? Do you have an inline fuel pressure gauge? I would suggest installing both those things when you reassemble your carb. And I would also suggest EI once you have it running again.
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