Hi Woodsy,

I was having a bit of a think about the engine on your Scott Bonnar. On some of my prewar Villiers engines the cylinder barrel has a Mark number on it - see photo below which shows the markings on the Mk VI-A engine on one of my Atco Standards.

[Linked Image]

This number is not present on all engines, as I have one that says that it was manufactured for Atco by Villiers and says 2 1/2hp. On later engines the number tended to be a part number. Is there anything cast on the back of the barrel as shown in the picture?

Cheers,

Sir Chook