Correction on the flywheels. One is 7MZ the other is 3PX, NOT 3MZ. The complete numbers on each are:
037000-2641 7MZ
037000-3322 3PX

Andy are you saying that the pickup coils for R4J and R5K are interchangeable as long as the flywheel is the correct size?
Also what is the timing issue with the flywheel/rotor? Just asking because I do have offset keys from Tyga which will advance the timing 1-4 degrees.