Sunbeam S8500: history, specs, pictures

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Sunbeam S8500
Also called S8 500
Production 1949 - 1956
twin, four-stroke
Bore / Stroke 70.0mm x 63.5mm
Top Speed 75 mph (120 km/h)
Horsepower 23.47 HP (17.5 KW) @ 6000RPM
Fuel System carburetor
Transmission Final Drive: shaft drive (cardan)
Clutch: dry singleplate
Suspension Front: telescopic
Rear: plungers
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 4.50-16
Rear Tire 4.50-16
Wheelbase 55.12 inches (1400 mm)
Weight 412.26 pounds (187.0 Kg) (dry),
Manuals Service Manual

The Sunbeam S8500 was a twin, four-stroke standard produced by Sunbeam between 1949 and 1956. It could reach a top speed of 75 mph (120 km/h). Claimed horsepower was 23.47 HP (17.5 KW) @ 6000 RPM.


The engine was a oil & air cooled twin, four-stroke. A 70.0mm bore x 63.5mm stroke result in a displacement of just 487.0 cubic centimeters. Fuel was supplied via a single overhead cams (sohc).


Power was moderated via the dry singleplate.


It came with a 4.50-16 front tire and a 4.50-16 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic while the rear was equipped with a plungers. The bike weighed just 412.26 pounds (187.0 Kg). The wheelbase was 55.12 inches (1400 mm) long.