I've sold quite a few car and bikes in recent years. No test drives or rides unless the potential buyer stumps-up with the cash before they jump into the drivers seat or saddle. With cars, I take 'em for a test ride (if they want to), have not offered this option with a bike.
Despite me being very clear in the ad with these conditions and all details re. car or bike, I get the stupidest questions like, where is St Helena (can't they use Google Maps), does it have a RWC (read the effing ad), can I take it for a drive / ride (ditto).
A coupla of potential buyers didn't like this condition and have walked away, cars and bikes have all sold in the short to medium term - except for a current Land Rover Discovery, although that's only been on the market for a month or so.
Mmmmm ... anyone want a Disco?
And, nice bike, good luck with the sale.