Lee,

i sell you my cossie with a blown headgasket. You know that, but you still choose to buy it. You take head off and find the head is warped because the car overheated which caused a headgasket failure. Would you expect me to take the cossie back because the head is warped, even though you bought it knowing there was a headgasket failure. Would you have the balls to even ask me. i would say get lost, you bought it knowing the problem and what other problems a headgasket failure brings with it.

He bought a bike that had been down, so he must also know that there may be other problems as well, due to the bike being damaged. Just as you knew when you bought it. So why have you agreed to take it back. He chose to buy it knowing it was damaged. Phone him back, say you've had a chance to think about it and you dont want it back