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Re: M21 engine id

So far as the bike is concerned I plan to keep it mostly as is ‘ex government’ trim. It appears to have been black since it’s wartime use except for the green tank panels which look to have been added later. I am quite happy with its current engine for now as it’s original engine JM23 159 is unlikely to be found or any JM23 engine for that matter. I may think about fitting a later B/M ohv engine one day.

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Re: M21 engine id

Ron Pier
If the breather is on the timing side, it sounds like post war crankcases to me. Email me the pictures if you want and I'll add them in this thread. Ron
Pics emailed to Ron Pier.
It’s an interesting bike I think.

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