Another person who would be worth speaking with is Colin Parker. Colin rode a RL outfit for many years in the late 70's early 80's and was very competetive on it, (I can't remember ever beating him). From memory the engine was taken out to 320cc (or some thing close to that). I hadn't seen Colin for many years and then ran into him at the Clare Swap meet last year, he is now playing around with a DT1 VMX bike and lives in Edithburgh on the Yorke Peninsula here in SA. I have lst his phone number, but I would presume it is in the white pages.
CJ