r.e. just be upfront and try to sort the tyre kickers out from the genuine buyers. Sight a drivers license is a must. Also a handy hint a friend gave me is have something printed up that they fill their name/lic number/the date stating they will pay any costs for repair and readvertisement if they cause damage to the bike while the bike is still in your ownership, remember that verbal agreements mean precisely jack shit in court(if it comes down to that).
Also for what its worth, when i sold my last two bikes, the first i was a real p.i.t.a to the guy and took him on the bike as i really couldn't afford to loose the bike (admittedly i had no idea on how to sell a bike). He bought it after fucking me about for a week or so.
Second bike sale, i advertised it on ebay, got a bid, the guy fugged me about for a week and then his wife saw the bike and he never returned any of my calls. F*ing asshole, at least i got him booted off ebay and a refund for my fees

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Oh then i put it on bikesales on friday evening and i got a phonecall within 5 minutes of it being put up on the net.I spent about 20 minutes on the phone answering various questions about the bikes history etc... Then the evening the next day she came to look at the bike and get the opinion of a friend of hers who also rides. She gave herself two days to think it over and then test rode it. I sold it about twenty minutes later on. Oh and when i met her at my units, i had the bike sitting in the middle of the unit parking lot and the garage closed so that if they weren't legit they'd not know where it was being kept.