Allround · 1921
Model J
MotoLibrary Score
55 /100 Balanced
Top Speed
137 km/h
Engine
989 ccm
Technical Overview
1921 Harley-Davidson Model J Technical Analysis & Specification Breakdown
At the heart of the 1921 Harley-Davidson Model J allround motorcycle, Harley-Davidson utilizes a 989 cc (60.4 cu in) v2, four-stroke layout. Internal engine geometry specifies a bore and stroke of 84.1 x 88.9 mm (3.3 x 3.5 inches).
On the scales, the Model J measures 145 kg (320 lbs) dry.
Within MotoLibrary's Harley-Davidson archive, this model family spans 15 indexed model years from 1915 to 1929, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Engine
Displacement 989.0 ccm (60.35 cubic inches)
Engine Type V2, four-stroke
Bore x Stroke 84.1 x 88.9 mm (3.3 x 3.5 inches)
Fuel System Carburettor
Ignition H.D generator
Transmission
Final Drive Chain (final drive)
Performance
Top Speed 136.8 km/h (85.0 mph)
Wheels & Brakes
Front Tyre 3-28
Rear Tyre 3-28
Rear Brakes Expanding brake (drum brake)
Wheels Spoked
Dimensions & Weight
Dry Weight 145.0 kg (319.7 pounds)
More from Harley-Davidson
Rider Profile
Who Is This Bike For?
🌍
Best For
All-Round & Adventure
⚖️
Handling
Manageable weight for most riders
Estimate
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