Hi bikerdude,
Here is another thread with a with a friends also "tapping" 4RT http://www.trialscentral.com/forums/topic/41773-noisy-4rt-top-end-noise/
I believe it turned out to be camshaft bearing related but I could be wrong, the memory doesn't last long now!!.
The SCRMC trial this Sunday has had to me moved to the Bob MacGregor Trials Academy at Dunlop as the access road to the quarry at Rigside has been washed out making access impossible. See the Trials Central calendar for more details.