I seldom disagree with 5twins, my unindicted co-conspirator in the XS650 Garage Carb Guide; but in my experience there are very few shops around that can do a decent job of rebuilding old carburetors, and they grow fewer by the day. Bret, I hope you were lucky enough to have found some competent folks, but if not, don't despair. Awhile ago I wrote a more comprehensive 26 page carburetor manual for the Yamaha 650 Society. It offers much more background information for the beginner, and includes trouble shooting symptoms and cures. If you need it, enroll on the Yamaha 650 Society Facebook page and send John Chaves a PM. The price is $17, US postage included.