Manufacturer: Royal Enfield
Model: J
Year: 1931
Displacement: 500 cc
Cylinder: 1
Engine type: 4-stroke ohv single
Bore / Stroke: 80.50 x 99.25 mm


Frame number: 10019
Engine number: J4138

In 1927 the Enfield company introduced its own 500cc 3½hp engine which shared the 85.5x85mm bore/stroke dimensions of their v-twin, giving a capacity of 488cc. An overhead-valve version joined the sidevalve original for 1929 and both used Enfield's own four-speed gearbox. In 1931 Royal Enfield the model J was the top model in the 500cc class.

This machine is fitted with an Amal carburetor, Bosch MagDyno and electric lighting.

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Royal Enfield J Series Motorcycles