Member BlueBomber posted this link to a web site with a TON of information about the 450's to include an online owner's manual, tire conversion chart, some rebuild how-to's, and a few other useful things. The site appears to be fairly old, as some of the links to other sites do not work but still it's very good source of info.

http://www.cb450stuff.com/index.htm

Link to the online manual

http://www.cb450stuff.com/manual/index.htm