I would give it back after i sell the bike.
If you had to sell it for less, i would just give him back the difference.
In my books this is being nice.....
A few years ago I put a deposit on a bike, conditions of sale was that seller was going to safety it. They called me a week later and told me to come get my deposit back because it was going to cost them too much to safety it. Lame excuse....I know they found another buyer at a higher price, but what could I do.
Gone are the days of honesty and integrity