Hey, just took the powervalve cover off my RM (complete rebuild, decided to play with the engine today :) ) I actuated the powervalve and to my surprise they are shiney clean. I guess that Silkolene Pro 2 does its job. Ok now for my question there is a knob on the left side of the engine case, right besides the powervalve. I've never adjusted this at all, just look like a dial for a better word. I'm guessing this has something to do with how far the powervalves open up. Can anyone clarify this for me? And maybe a setting even? I'm just wondering if this little dial might help open up the bottom end a bit...