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I agree with the other comments about why he doesn't sell it outright. Maybe I'm overly cautious but it very quickly raised my 'Sounds too good to be true, what's the catch' flag.
Lets see, the car appraised for $43k and could bring about $60k if he sold it. Instead, he wants to trade you for your $25k (approx) bike. Sounds too good to be true right? Probably is.