rj,
I have a recollection of reading about a problem some guys were having with their RX3 bikes. Perhaps it is the same problem that wilsoncheah has mentioned.
I think the gist of it was that the bottom and the top engine mounting (The triangular bit), were putting the engine under too much tension and pulling the rocker cover slightly apart. But it was enough to create an oil leak at this joint.
I think their solution to this was to fit 3 bolts of a smaller diameter, this would then allow the triangular mounting piece that attaches to the triangular mounting on engine, to sit a little lower.
yellow arrow = where the triangular mounting piece fits on to engine.
red arrow = the joint where the oil leak was occurring
