Won't do it. Too much can go wrong. #1 your friend could wreck your machine and not be able to afford the repair (loss of a friend). #2 Your friend gets himself banged up bad, or killed and then you can live with that over your head. I won't ride other folks bikes and they don't ride mine. Borrowing a motorcycle isn't like borrowing a cage. You generally can't hop on a different scoot and feel right at home. Too much can go wrong. Just my 2 cents worth.