BSA M21 600cc side valve 1953 runs for the first time
BSA M21 600cc side valve 1953 runs for the first time after extensive rebuild
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verry nic sond,10*
Beauty!
Very nice M 21 , beautiful restored , sounds great .
You can hear the alloy cylinder head, ting ting ting ting
love this bike great job, I know where there is one trying to buy it before it rusts away .