Rodney,
That is a real old one I think it is a MK10 model.
Here is some information:The Villiers Mk.10 stationary engine.
The Mk. 10 Villiers stationary engine was a typical Villiers product. It was simple, neat and compact, with few moving parts. Because of this simplicity, Villiers engines were reliable and easy to maintain. The engine included the Villiers flywheel magneto, with the engine cooling fan mounted on the outside of the flywheel. Most of the parts were made in-house and additional parts were available for petrol-paraffin running.
The engine had a 50mm bore and a 50mm stroke. The total swept volume was 98c.c. and the engine could deliver 1h.p. at 2,000r.p.m., and 1.3h.p. at 3,000r.p.m. It was air-cooled and used an oil-wetted type of air filter. The capacity of the fuel tank was 0.5 gallons and the lubricating oil sump held one pint. It was fitted with a Lodge spark plug and Villiers carburettor.