monsterxs

I'm in the middle of restoring/ressurecting a 1974xs500b myself, its the exact bike you have. The carbs are pretty simple on this bike. If you have one complete one, take it apart and see if you can figure out what's missing on the other. it may be too late now but if you don't take the two apart from each other, you wont have to sync them. Simply, if the motor spins, it'll run, these are pretty basic animals. clean ther jets (the jet orifices are pretty small, a strand from a bicycle cable will work) the bowls and make sure the floats move freely. Check for spark (pull a plug wire and see if it arcs to a closely placed piece a bare metal. Remember, this bike has a kick start, you may have enough wiring connetcted for it to run. Lastly, remember, this isn't the most popular bike out there,some parts are scarce. MikesXS.com hasgood info and parts. If you find a helpful site, please post it. Happy wrenching!