Thanks for the replies and advice. I have reshimed the errant exhaust valve back to 0.006" and have put about 6 hours operating time on the motor. Will wait until approximately 10 hours operation before checking the valve lash again. I am hoping that Mike Perry is right and my valves stabilize for an extended period of time. By the way, I have the full PC Racing seal kit on the bike including the neoprene foam gasket on the filter side ... the airway has never shown obvious particulate matter entering the system and I have maintained the Twin Air filter religiously. On both occasions of top end rebuilds so far, the cylinder wall and piston rings have been in excellent condition and did not show signs of excessive wear indicative of entering particulate matter in the air stream ... while not necessarily conclusive, particulates do not seem to be the culprit in my case?
Regarding valve guide considerations, Mike, the Honda techs informed me that the Kibblewhite folks explained I did not need to replace the original Honda guides since I was not changing the cam and they did not show obvious, visible signs of wear. Hence, my motor has all new Kibblewhite valves and associated Kibblewhite valve spring kit components, but retains the stock, original Honda valve guides.
Regardless, the motor is running about the best I can remember ... it starts well when either cold or hot, and the kick start resistance has begun to noticeably decrease with increasing run time on the motor. I will let you folks know what happens when I next check the valves.
Again, thanks to all for your kind help and considerations ... terry nestrick