UPDATE: Sold. Let's hope to someone who is going to race it.
Thanks to Kev for sending us the link to this Yamaha XS650 for sale on UK eBay. Looks like it has potential to be a Vintage DTRA race bike. It's on 19s. Buy it now for £1750.
Please note this sale is nothing to do with us and we know nothing about the history of this bike, so buyer beware. G