If selling a motorcycle and it has two names on the title do both parties have to sign it or just one
To avoid any future legal issues both parties whose names appear on the title should sign it. If one person signs and an issue arise the contract can be declared null and void.
It would have to be signed by both parties .. much like a cheque that has 2 signing lines .. It's to ensure that one doesn't do it without the permission of the other.