The selected attachment does not exist anymore.
Dang I missed it too...link is dead.
I don't exactly know what file was posted but I have extracted the carb section of the manual and posted it here
https://expirebox.com/download/180cc978c...7dfee.html
It will expire in 48 hrs so get it now
Your profile shows a GL1200 year 2002, the gl1200 models were produced 1984-1987
Generally speaking, TB refers to a "throttle body". Usually a term used in fuel injection. God only knows what was being offered or what the question/complaint was.......may have nothing to do with carburetion.