G'day Richard75,
A warm welcome to the ODK forums.

We don't appear to have a Villiers Spec Sheet available that covers a Spec Number that high, but the X definitely denotes Australian manufacture. That would have been at Villiers Australia's Ballarat plant. It may have a date stamp on the flywheel, in the format M/YY or MM/YY.

As this is a horizontal shaft engine, used in many industrial applications, it's probably unlikely that it has a customer-specific Spec No., unless it has unusual features like gear reduction or a non-standard PTO shaft.

It has been suggested in the past, that the bloke at http://www.vaces.com.au/ is the best source for Australian Villiers parts, and maybe info too.

A workshop manual download: http://www.nigelpacker.me.uk/Villiers%20WSM.pdf

Cheers,
Gadge

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