I wouldn't use Paypal for something like that. Most people don't realize that Paypal can reverse a Payment if the buyer empties their band account after the fact.
That happened to me once. I sent an order of bows that were paid through Paypal, then found out the payment was reversed a week later. My buyer had overdrawn their account and the bank wanted to recoup it's money so they reversed her recent Paypal payments.
In my case, it was a repeat customer who just sent me a money order. It was also only $25 worth of bows.
I had no idea Paypal payments could be reversed by a buyer's bank before this happened.
I'd insist on a cashiers check from anyone who buys the motorcycle.