But, he may benefit if the friend allows the bike to stay in his name, due to the fact it will be hard for him to get his own loan, unless he $9K in cash handy. To me the idea of taking over payments is paying the friend, who pays the loan. Now if he wants to assume the loan then to me that mean the bank will run his credit and remove his friend from the loan and put him on it.
But, overall I agree, it is a good chance for both parties to get screwed. when I was in the military I went to Korea for a year. I had a new car with low miles on it, my sister asked to take over payments, since I would be storing it anyway and making payments. So I paid the note, but she would send her payments straight to me. I paid it so that I would ensure my credit stayed true and I would just wait for payment, which didn't always come on time. Long story short I was gone a year and she could not get her own loan in her name, so I had to go get my car and get rid of it. As noone take cars of your stuff like you will, she added almost 30K miles in a year...she lives in a rural area and family members all needing rides from the person with the most reliable car...
So when I got back I needed a car myself and at the time couldn't afford to have two in my name, I had to repossess the car from her and trade it in...obviously I took the hit and now the car had high mileage on it for its age...Note to self, never do that again...