Have just started the rebuild of my long term dead MC21.

Opionions on this head please - I'm assuming that's some detonation damage:



I'm reluctant to try wet n drying it as that'll reduce the compression...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball