All is not lost! There is an XS650 Specialist in the UK called Palma tuning. You can find us at the following link.
http://www.palmatuning.co.uk We are based in Warwickshire, England and will be ready to trade fully with the public later on this year. At the moment we are spending our time on testing and developing new tuning products from big bore kits to rephased crank shafts. We are dedicated to the XS650 and have years of experience with these machines. You can contact us via our web site if you need any help or advice prior to our grand opening.