Sport · 1931
31DLD
Technical Overview
1931 Harley-Davidson 31DLD Technical Analysis & Specification Breakdown
At the heart of the 1931 Harley-Davidson 31DLD sport motorcycle, Harley-Davidson utilizes a 742.6 cc (45.3 cu in) engine layout. Internal engine geometry specifies a bore and stroke of 69.9 x 96.9 mm (2.8 x 3.8 inches) with a 6.0:1 compression ratio.
On the scales, the 31DLD measures 181 kg (399 lbs) dry.
Engine
Displacement 742.60 ccm (45.31 cubic inches)
Engine Details V2, four-stroke
Compression 6.0:1
Bore x Stroke 69.9 x 96.9 mm (2.8 x 3.8 inches)
Fuel System Carburettor
Transmission
Final Drive Chain
Wheels & Brakes
Front Tyre 42820
Rear Tyre 42820
Front Brakes Expanding brake (drum brake)
Rear Brakes Expanding brake (drum brake)
Wheels Spoked
Dimensions & Weight
Dry Weight 181.0 kg (399.0 pounds)
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