Progress is fine, but it's gone on for too long.
with apologies to Ogden Nash...
Thursday, September 26, 2019
Ariel Square four 4F cutaway drawing
This would be the original OHC model made from 1931-36 in 500cc form, enlarged to 600 in 1932 by way of a 5mm bigger bore.
Once again no artists name for this very nice drawing.
Below, actual cutaway of the 600cc version.
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