Rs34 repair help

I'd hit the salvage yard, remove the old broken part and find a new one to rob off another carb, or just buy one carb from their pile if they have one. Or plug it off and run your 3 chokes instead of that one lol.(thats poor boying it)

is it just a choke?

That's what it looks like. Feeds the enrichment(choke) circuit.

then i could prolly swing it, iv e checked every carb i could get my hands on to no avail.