Pre-unit thumpers with gearbox that bolted to the back of the engine and dry sump cast into its bottom, post ’56 models have superior engine and chassis. Also 350 Clipper – Bullet engine in Clipper chassis – and Bullets are still made in India! Engines are generally reliable, even if they leak a lot of oil, most hassles from the Albion gearbox. Prices of mildly modded, nicely rebuilt machines are quite reasonable.