I have the same problem,the bike went into a local dealer 14 months ago,head skimmed by 3 thou and new sealing ring,valves re cut etc,its done 570 miles since and just gone again,as you can imagine they dont really want to know,cost 350 pounds,not sure what to do next i cant keep skimming the head so perhaps break it and give up,any idea on how to stop it leaking please

Motorcycles - CCM - 604 RS Roadster - 2001 CCM 604 RS Roadster