I have been looking for the last two days for a big bore kit for my KTM 690 Duke. It is currently legal in Clubman, DSS and DSB. The ONLY big bore kit that I can find is 796cc. Rulebook states unlimited singles in Clubman but has a 775cc limit in the D classes. I am curious as to the origin of that rule. I don't recall previously seeing or hearing of anyone building a single bigger than 775cc. And if any of you know someone that would build me a 775cc please let me know.