B.S.A Stationary engine

 

The engine is a:
BSA Model 119 power Unit
Max 2.25 BHP at 3,600 RPM
Bore 2.324 in. (59mm)
Stroke 1.732 in. (44mm)
Capacity 7.32 cu. in. (119cc)

Engine specs supplied by Steve Woods ( thankyou )