Triumph motorcycle engine, 1912.
4 0 c m
actual image size: 25cm x 32cm

Triumph motorcycle engine, 1912.

© Science Museum / Science & Society Picture Library


An early example of the simple but robust single cylinder engine which contributed much to the popularity of motor cycling before World War I. This 3.5 hp Triumph design established the trend for side-valve motorcycle engines for the next twenty years. A chain sprocket later replaced the belt pulley drive on the crankshaft.

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