When I sold my last bikes I had two modes - if you rolled in on a bike and were serious I would let you test ride. If you didn't have a bike but were serious, with an endorsement and gear, we would go up to the nearby school parking lot and you could shift it through a couple gears and see that it was as advertised. In the end though, the guy that bought my last one was not yet licensed and paid full price without even seeing it drive up the road. It's really just a judgement call on a person by person basis, but I am like the others that said there is no way I am giving you that amount of cash without a signed title and some prior proof that the bike is what you say it is.