Simplex Automatic: history, specs, pictures

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Simplex Automatic
Production 1942 - 1960
single cylinder, two-stroke
Bore / Stroke 50.8mm x 64.3mm
Horsepower 3.89 HP (2.9 KW) @ 5000RPM
Fuel System carburetor
Ignition magneto
Transmission Final Drive: belt
Clutch: variable speed automatic
Suspension Front: leading link
Rear: rigid
Brakes Rear: expanding brake (drum brake)
Front Tire 2.50-26
Rear Tire 2.50-26
Wheelbase 47.01 inches (1194 mm)
Weight 134.92 pounds (61.2 Kg) (dry),
Fuel Capacity 2.5 Gallon (9.46 Liters)
Manuals Service Manual

The Simplex Automatic was a single cylinder, two-stroke standard produced by Simplex between 1942 and 1960. Claimed horsepower was 3.89 HP (2.9 KW) @ 5000 RPM.


A 50.8mm bore x 64.3mm stroke result in a displacement of just 130.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).


Power was moderated via the variable speed automatic.


It came with a 2.50-26 front tire and a 2.50-26 rear tire. The front suspension was a leading link while the rear was equipped with a rigid. The Automatic was fitted with a 2.5 Gallon (9.46 Liters) fuel tank. The bike weighed just 134.92 pounds (61.2 Kg). The wheelbase was 47.01 inches (1194 mm) long.