norton motorcycle big four (model 1) army
the first model The Big Four
Norton model 1 (or some know it as the norton Big 4) was the first bike that Norton motorcycle build. Back in the 1907 to 1954, Norton model 1 has come up with many form/modification. At that time, the big four also known as one powerful bike with its 633cc engine. with one big powerfull engine of it's era, model 1 mostly used to haul sidecars. from 100.000 bikes that were assemble, around 4700 were designed to have a sidecar mounted to carry two or three men plus their fighting equipment over very rough terrain.
The very first model of Big 4 machines were made for civilian versions back in 1907 with a bore and stroke of 82 x 120 mm. they continued to produced the model for another nine years after the end of World War II when Norton ended the production of side valve singles to concentrate on twins.
the Norton Big Four military model was developed during the prewar, with so many trials to mounted the sidecar wheel coupled to the motorcycle rear wheel through a dog clutch and drive shaft. Initial trials were performed at Studland in Dorset and it coped well with the challenging terrain. The design was meant to make sure that it is easy to maintain in the field.