Based on the name, you might think this bike was powered by some sort of four cylinder engine – but you’d be incorrect. Produced between 1907 and 1954, this bike got its name from the fact that it produced 4 horsepower according to the early system of “tax horsepower”, which had nothing to do with actual power produced but instead was a calculation based on cylinder dimensions.
The bike actually produced about 14 horsepower (as we know the unit to exist today). The Big 4 started as a civilian bike but Norton produced thousands for the military as sidecar units during WWII. This example has 6,000 miles and is claimed to be numbers-matching and in good working condition. It has a newer gas tank but the original unit is also included.
Find this Norton Big 4 for sale in Oulu, Finland with an unmet opening bid of $8,000