OK< as of this morning, I looked at both sides after taking the pipe off. On the right side where the hook/arm comes up and works the valve, there was a little triangle piece that was next to an allen bolt stop.
The valve was not resting on it, but was hovering about 4mm away from it. I could look into the exhaust port and by working the mechanism a little I could get the valve to move further toward the piston and the triangle piece to hit the allen. If I let go, it opened back up again.
So you would recommend me take the case cover off and shim this up so it stays closed? I do have a noticeable rattle in the lower range when accelerating slowly.
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'10 EC300 -- very happy 
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