Designed in wartime, the Sunbeam inline twin was introduced in 1947. A luxury tourer inspired by the pre-war BMW, it was of advanced specification with overhead-camshaft engine, shaft drive, and plunger rear suspension.
source.image: classic-motorcycle.com
The clutch housing and four-speed gearbox bolted directly to the back of the engine, which was rubber mounted in the duplex loop frame, an innovation that required a flexible joint in the exhaust system ahead of the silencer.
The first S7 version was equipped with balloon tyres, a feature not carried over to the more conventional S8 introduced in 1949.
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Never as popular as BSA’s more performance orientated models, the gentlemanly S7 and S8 remained in production until 1957. This S7 is ready for the road and runs smooth. Year: 1950.Displacement: 487 cc. Cylinder: 2 / inline. Engine type: 4-stroke / ohc. Bore / Stroke: 70 x 63.5 mm. Power: 25hp @ 5.800 rpm. Weight: 195 kg. Top Speed: 121 km/h
