Tags: Motorcycle.
The Model 1 or more commonly known as Big 4 was a Norton motorcycle made between 1907 and 1954 in various forms. With 633 cc (38.6 cu in) it was the largest and most powerful side valve engine with plenty of low end torque in the model range and was mostly used to haul sidecars. Approximately 4700 of the nearly 100000 military bikes made by Norton during WW2 were Big 4 sidecar outfits.
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