Motorcycle sales?

Hello people! Maybe someone knows about it or has done something like this before and can give me tips. So this is the situation: I want to sell my motorcycle and have a buyer. However, he would buy the motorcycle without having seen it!? I know sounds funny, but it’s like that. He just lives at the other end of the republic and doesn’t want to drive all over Germany. Now the question is how do I go about it? How do I do it with the purchase contract? By fax or by post? Beza How exactly does this work? Or do you have another idea? Can I exclude anything else so that he can not come with any additional demands or withdraw from the purchase contract? Have I downloaded the ADAC purchase contract now. does that fit or should I take another one for one? Thank you already. Greetings Weili.