The featured engine here is a 1937 Briggs and Stratton Model WM 4 cycle engine. The model WM was manufactured from 1936 to 1941. The WM was designed for washing machine use.
This model has a foot-pedal lever to start the engine.
Model WM is identified by the horizontal spark plug and a low engine profile, (to fit under washing machines). This engine used an L-head design, (also known as flat head).
It was equipped with an adjustable pneumatic governor.
The type I mixer was used on this model to provide the fuel mixture. The exhaust is aspirated through a 1/2" NPT threaded port. Gas tank is mounted external to the engine itself.
The oil sump has a steel bottom plate. The head is made of cast iron. The engine block is made of cast iron and utilizes fins for
air cooling. This model is equipped with an external breather.
Piston and connecting rod are made of aluminum alloy.
The crankshaft is counter-weighted and drop forged.
Displacement: 6.28 cubic inches, 2.00" bore and 1.50" stroke.
Rated at 0.50 horsepower.
Lubrication: Pump type, (later converted to splash type).
Ignition: High tension magneto.
Spark plug: 14mm. Oil sump capacity: 1 pint.
Gas tank capacity: 1 quart.
Briggs and Stratton is the trade name of the Briggs and Stratton corporation.
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