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« on: July 03, 2025, 02:13:03 PM »
I’d expect that to be a Mk16A, 67x70mm bore & stroke, made 1934-40.mainly viewed as the standard 250cc workhorse of the range.
Villiers made a surprising range of 250’s in that period. With Autolube system or petroil, air cooled, water cooled, short stroke or long stroke, flattop piston, deflector top piston, long bush plain main bearings or ball race with seals. Yer pays yer money and takes yer pick.
The 16A was about as standard as it got. Petroil, deflector piston, long bush plain mains. Well tested technology but will plonk along forever.
That particular Waratah looks very much like the 1938 Excelsior Meritor.