MC21 cylinder disassembled and ready for cleaning. Nikasil damaged and needs a replate. Bridge is cracked but extent can't fully be determined until it is clean:

MC18 cylinder disassembly underway. Waiting for penetrating oil to do its job before trying to remove studs:

Power valves all coked up. Not a good shot but there is almost 1/4" build up on one:

Does the color of this head look about right?

I am now up to current. Time is short what with work and family and progress comes in short bursts but super slow at work so ordering parts and research can be fit in the day quite easily.
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MC21R9N track
MC18R2J track
CBR954
CR250