A 400 is tight for me and you're about 6" taller, so stay away.
And it's not powerful enough. Even I in my safety first fatherhood mindset(you remember how slow I was on the Lincoln run last year) thought it needed the 600 motor that I shoved into it over Christmas.
Has the YZF gone? Hope it was for a profit! If not then why not just clean the carbs and go?
There's been a few exups going through ebay for less than a grand... none of them float yer boat?