Jets unless poked/cleaned roughly with something unsuitable don't really wear out, OE parts are going to be way better quality than pattern parts. If you bike is running as you say you probably need to to nothing more than just a good clean of the carbs, inspect all the jets. Pay particular attention to the metering jet and the needle that goes in it, the one the float attaches to. Also check all the main needles are set to the correct height ie the clip is in the correct slot on each one. Find a set of downtubes with a working EXUP reconnect the servo, hopefully that's still there and working?
Set the cables, a good carb balance and away you go as Yamaha intended.
Set the cables, a good carb balance and away you go as Yamaha intended.
Later