–SG– … when it is a South Australian Railways copy!
Many due to Leon for a profusion of photographs – and data – relating to the 557cc SAR engine courting from about 1910 to 1915. It appears they had been fitted to small railway upkeep vans and fairly just a few of them had been available again within the sixties and seventies. However now, they’re fairly uncommon.
Though the crankcase castings incorporate substantial additional mounting lugs, it is vitally clearly a Norton copy. Whether or not Nortons had been paid any type of premium to be used of their fundamental design isn’t identified. The photographs of the cylinder barrels – Norton on the fitting in all instances – reveals the design similarity and the cams/followers look very similar to these employed through the twenties.