633 = Norton Big 4 (Model 1) med ensylindret motor på
633 kubikk:
Mer info på
denne siden, bla dette:
"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."
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