1948: The new 350 Gold Star launched, based around the all-alloy 348cc-engined B32. It used a plunger frame, and buyers could specify cams, compression ratio, carb, cylinder head, exhaust, gearbox ratios, lighting, tyres, and electrical systems – which were all picked out from the best in the factory stores. The bikes were individually assembled.
1949: The 350 was joined by a 499cc B34 version, which used a new main bearing and a revised crankshaft.
1950: The front brake size was increased on both models.
1952: The Gold Star got a new cylinder head.
1953: A new duplex cradle swinging arm frame was introduced, along with an improved gearbox.
1954: A new engine option was introduced, with more and squarer finning, a shorter conrod, stronger crank, oval flywheels for the 500,…