The A50 Royal Star Im still working on was reimported back from America, the engine crankcase had a gloss sparkle paint coating on. Ive had it vapour blasted off, but have noticed a couple of other A65 Thunderbolt motors that are also painted in the same way, with primary and timing covers either polished or chromed.
was this something done for the American market or just coincidence but custom owners?
I have never seen anything but standard BSA bare aluminum engine parts (black iron cylinder excepted) on a stock bike. In the 1970's painting engines to match tank, frame etc. was popular for a while here in the US so it's possible that your bike was "customized" at some point.
thanks Mike,
oh, it was customised at sometime...
and still is, awaiting cases back to rebuild