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Top end looks very 'D' (itself derived from the Kenilworth scooter engine of course) while bottom end is pretty much identical to Mark Howard's water cooled possible prototype:-
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What do you think?
I know Mark wanted it but the price went too high - someone obviously rated it well beyond curiosity value.
BTW. Anyone go a decent pic of an 'S' - I can't think what the bottom end looked like before the mag went chain drive with the 'SC'?
NHH