Allround · 1921
Model W Sport Twin
Technical Overview
1921 Harley-Davidson Model W Sport Twin Technical Analysis & Specification Breakdown
Positioned in Harley-Davidson's allround motorcycle lineup, the 1921 Harley-Davidson Model W Sport Twin pairs a 584 cc (35.6 cu in) two cylinder boxer, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 69.8 x 96.8 mm (2.7 x 3.8 inches) with a 5.8:1 compression ratio.
On the scales, the Model W Sport Twin measures 113 kg (249 lbs) dry.
Within MotoLibrary's Harley-Davidson archive, this model family spans 6 indexed model years from 1919 to 1924, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Engine
Displacement 584.0 ccm (35.64 cubic inches)
Engine Type Two cylinder boxer, four-stroke
Compression 5.8:1
Bore x Stroke 69.8 x 96.8 mm (2.7 x 3.8 inches)
Fuel System Carburettor
Ignition HD Generator
Transmission
Final Drive Shaft drive (cardan) (final drive)
Wheels & Brakes
Front Tyre 3-26
Rear Tyre 3-26
Wheels Spoked
Dimensions & Weight
Dry Weight 113.0 kg (249.1 pounds)
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