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The 541D engine is from the Villiers 50cc to 75cc Lightweight range. The engine was fitted with the Villiers flywheel magneto, with the engine cooling fan mounted on the outside of the flywheel. Cooling air is drawn through a rotating gauze. Speed was controlled by a simple air-vane governor, although some engines had no governor. Idle speed was controlled by a two position linkage (Run & Idle) on the B10/1 carburettor or a throttle cable on the S10/2 carburettor. Most of the parts were made in-house.
The 50cc engine had a 43mm bore and a 34mm stroke. The 75cc engine had a 52mm bore and a 34mm stroke. The engines are fitted with either a Villiers S10/2 or B10/1 carburettor as standard, the air filter being of the oil-wetted gauze type or paper element. The capacity of the fuel tank was 1 pints. Lubrication is by “splash”. The oil sump held 1/2 a pint. It was fitted with a Lodge CN or ChampionL10 spark plug.
The Light Weight engines were normally used to power lawnmowers.
The engine shown below was obtained in an unused condition in the original box. It is being preserved in this condition and will not be used.
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