To me it looks like a dead fet a 2sk1059. in the pgm

I have done some digging and it seems that honda have
discontinued the regulator that that MC21 came with the sh609-12
and replaced it with a part numbered 31600-MV4-010

Has anyone tried one of these 31600-MV4-010 regulator on
an NSR ?..

I also have a regulator off an mc18 some place if I can find it
wil that work on the mc21 ?

I can also try the mc21 servo on my mc18 if they are the same part.

regards
Ian