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I suspected the fuel line, but I did plug an extra motor side connector into it and it flowed plenty of fuel when I pumped the bulb. People asked about the fuel filter but I don’t have one on this motor other than the screen at the fuel pump inlet (I had swapped on a later small square fuel pump).
I’m thinking maybe change the plugs, which I already did, use another fuel tank or at least another fuel line, and also bring some WD-40 or something to spray onto the crankcase covers to see if I can find a leak there while it is surging.
On a totally unrelated note, does anyone want to buy a ’63 15HP Gale Buccaneer that runs great in a barrel? (joke)