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I had the same issue. I know the valves to be in spec, and it was still noisy as hell and has been since 5k miles when I got it and has 17,300 on it now in just 8 months. I bought a parts bike that had a spun rod bearing, so I took the tensinor off that motor and cleaned and lubed it with Fel-pro assembly lube. Bike is dead quiet now, lets hope it stays that way.
I also seen that the tensinor arm for the timing chain tensinor can bottom out on the engine case and only a slight grinding with a dremel can get a bit more throw out of the tensinor and should stay quieter longer. Here is a pic I found where it needs ground.
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