Automatic
1947 Simplex Automatic Technical Analysis & Specification Breakdown
Engineered by Simplex for the allround motorcycle segment, the 1947 Simplex Automatic pairs a 130 cc (7.9 cu in) single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 4 HP (2.9 kW) at 4,000 rpm, transferring power to the rear wheel through belt final drive. With a specific output of 30.8 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Automatic measures 61.2 kg (135 lbs) dry. Rider ergonomics and chassis geometry center around a 1,194 mm (47 in) wheelbase engineered for quick, flickable steering geometry. The 9.46-liter (2.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Simplex archive, this model family spans 18 indexed model years from 1942 to 1960, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
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