Neat! Haven't seen one of those in person in years. Used to know a guy that had one, the front suspension with that hoop around the back of the tire always looked odd to me but it seemed to ride pretty nice. He used it for hauling stuff around his property etc.
Yep you have a vacuum actuated fuel pump. I despised those on the old sleds i used to ride, seems like the diaphragms in them always went bad when you were in the middle of nowhere... LOL.. If parts could be had for the fuel pump i would go through that as well, at least take it apart and clean it would be a good idea in case its got crud in it like the carb.
I'm not too familiar with the electrical system on these, i would have to look at a diagram, just wondering if its got a DC lighting system or AC and if there is a regulator. Reason being, trying to figure out why they unplugged the tail light. Could have just been a bad bulb or maybe a short, who knows. I would just go through it and figure out whats up with it but if you don't need the light maybe its best to just leave it unplugged... LOL
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....