not if it's not as advertised. I'm sure I've read it in the terms somewhere. I would still give it the once over before handing over any cash though.
Just remembered. Been offered this for £650, what do you reckon. kawasaki zx9r ninja spares or repair (track bike) | eBay
Not really mate, I've bought four maybe five bikes off ebay, if it doesn't fit the description (which leaves plenty or room for disagreement I know) you can decline to buy. You'd contact the seller first to agree to put a deposit down of a few hundred and the rest in cash on collection. Been ages since I bought an ebay bike but I think that's what I used to do, can't recall ever paying the whole asking price up front.