Home WORLD Old 1950 Sunbeam S7487cc Two Cylinder Starting Up

Old 1950 Sunbeam S7487cc Two Cylinder Starting Up

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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(PrtSc): 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.

  • Manufacturer: Sunbeam
  • Model: S7
  • 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
  • Production years: 1946 – 1956
  • Units: 7.658
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VIAclassic-motorcycle.com
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