Thanks Andy. Very informative as always. Based on your comment about mixing and matching parts from different years, does that make the HRC method of feeling the actual valve position in the exhaust port more realistic in your opinion? Or can the exhaust valve position be accurately inferred from the pulley position?

My bike is intended for track use only. Might i do just as well to just set the valve in the fully open position? I won't be spending much time between 2 and 3,000 RPM.