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The Mk15 Villiers four-cycle, overhead valve (OHV) engine was introduced in December 1953. It weighed just 48lbs. This engine also included the Villiers flywheel magneto, with the engine cooling fan mounted on the outside of the flywheel.
The engine had a 63mm bore and a 47mm stroke. The total swept volume was 147 c.c. and the engine could deliver 2.5 b.h.p. at 3,600 r.p.m and 3 b.h.p. at 3,600 r.p.m (HS Engine). It was air-cooled by fan and cowling. The engine was fitted with a Villiers B10 carburettor as standard, the air filter being of the oil wetted gauze type or oil bath. The capacity of the fuel tank was 0.5 gallons. Lubricating is by “splash”. The oil sump held one pint. It was fitted with a Lodge C14 (14 mm) spark plug.
All of the four-stroke models could be supplied with a special vaporiser and fittings to allow the engine to operate on paraffin. A two part fuel tank was also supplied. Where an application required a higher than normal operating speed, the HS engine was available. While the HS engine was basically the same engine, a number of modifications were made to the carburettor air cleaner and governor settings. An oil bath air cleaner was fitted as standard.
The Mk15 engine was admirably suitable for driving Hoes and other small agricultural implements, etc. Where a slow speed output shaft was required, a reduction gear could be fitted.
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