My 1933 Norton Model 18 on the dyno. Completely standard apart from a small increase in the compession ratio to 7:1. It produced 18 BHP at 5000 rpm at the back wheel and I was very pleased with it. No baffles in the silencer brought the main jet up a couple of sizes to 190. It belonged to my Father who bought it in 1941, its called the 'family silver'. My Baby.