Whilst I am working on an MC18 track bike I have an MC21 engine to rebuild. I'll keep this as a seperate thread. Here are photos after cleaning in "soup":





Yes, it has one MC18 cylinder. And the MC21 barrel is SE/SP with R head, nikasil damage and cracked bridge.

The good news: I sorted out how to download full size images. Thanks yakama.
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MC21R9N track
MC18R2J track
CBR954
CR250