Hiya Phil, that's a good shot. My thoughts:
Starbursts are lovely. They complement each other and just simply work. Top, top notch on those. Also a very shiny bike, lovely paintwork and really clean - as you'd expect for a "for sale" ad!
You've mentioned the road etc. I think a nice open field and this photo would start to sing. This is the biggest thing for me stopping it being a truly wonderful shot... as it is, it's a very good shot.
Shadow - I really like this and my only crit here is that I'd like the whole shadow in frame and enough space to the right to satisfy myself it's all in frame! As it is, I'm left wondering.
Composition - I really like the fact it's pointing away from you... kind of ready to drive off already. Which works given them description. The only other composition apart from a grass field which springs to mind is to
find a very very quiet road and park the bike up in the middle of it... with the road stretching away into the distance. Wow
Good shot though and some really nice technicals - and we're all guilty of needing to check the rest of the frame before pressing the shutter!