First, some of you guys have rocking 550's DANG!!!
Second, motorcycle hobby, a little advice.... Lose or sell anything you're not using these days, get a fund started. when stuff like $400 bikes come up you have $ waiting. The 550 could be parted and profit used to finish CB. Every time I sell a bike, I slip the wife some "her $", this shows her our little hobby is paying for itself and her cut makes it much easier when I drag the next p.o.s. home to stuff in the garage. I also make sure any other duties I have are taken care of before I hunker down in the garage. At this point there should never be anything negative out of her. You've shown her your hobby is self sustaining and she is part of your process. Bottom line is I can't tell you how many guys I know that have closet's full of hobbies they no longer take part in, and complain they haven't any $ for bikes.
I know this is sick and now my addiction, but I've gone as far as to quite smoking and drinking so I can buy any bike I feel I need. Unfortunately that means I'm hustling to keep four bikes running. But I always have something on the burner to flip, right now I've run into a Yamaha GT80, I don't know why, but in my neck of the woods they bring good $, and when this is gone, I have two Z50's lined up, altogether I'll clear about $600, a coulpe bills to the wife and more parts for my current rides. Ya gotta work it to get to your goals. At $400 the 550 parted is probably good for 2-300 clear and maybe you keep the frame or other parts for future project...