[OLD...BILL]

First that pump is savable, with some care and whill your waiting for parts, take it off the carb cover, and find a tube, bottle top, maybe a 5/8 socket and put the pump rod down inside and pull the leather up around the spring, and reshape it ,,,now soak it with "neatefoot oil" or good hand cream with lanoan?? something good for leather, it will come back to life, or good enough... I would also polish the hole the pump work's in, some one pushed it in, without running it around at the start, opening (its tapered)... you don't need a lot of pump, as to where those carbs. sit.... try it sometime when all else is work and running good ...take both pump rods off and give it a run, like at 30 or 40 put in second bring the engine up to speed, now step on it hard.it should pick up and run from the get go. untell you run out of RPM's
Now as your waiting for parts, put the top back on the carb. ( no pump) ok. run the engine up to temp. get a good clean clear piece of glass. look/watch inside the carb in question, engine running at ideal, watch for moor gas to drip in, bring the engine speed up, 800 to 1000 rpm's and look some more.... you should trace the runners in the intake ,and find the plugs blacker than the others ?? they may be cooler than the others as they are weather ?? something to think about ..... OLD.....BILL