HARLEY-DAVIDSON Fat Boy (1991-1992) Specs, Performance & Photos

In 1991, the American motorcycle manufacturer launched the Harley-Davidson Fat Boy, a machine part of the Fat Boy line-up in H-D's range. The bike debuted in 1990 and didn't feature any changes for the 1991 model year.

The bike was powered by an air-cooled engine with a 1,337cc displacement, commonly referred to as the Evolution engine. As for the power figures, the bike boasted 67 hp at 6,000 rpm and 97 Nm (72 lb-ft) torque at 2,350 rpm.

Styling-wise, the 1991 machine was not different from its predecessor, packing a teardrop-shaped fuel tank, a wide handlebar, valanced fenders, a dual exhaust system, a wide dual seat, a round headlight with a chromed housing, and solid disc wheels.

The bike's suspension was handled by a 39 mm telescopic fork on the front and dual spring preload-adjustable shock absorbers on the rear, delivering excellent suspension performance and handling.

The stopping power was achieved by a 292 mm disc with a four-piston caliper on the front wheel and another 292 mm disc with the same four-piston caliper on the rear wheel, providing strong braking performance.

A false etymology circulated around that the bike's name was given as a symbolic insult to Japanese motorcycles, naming it after the Fat Man and Little Boy atomic bombs dropped on Japan in World War Two. In fact, the Fat Boy designation was simply descriptive. The Fat Boy was wider than other bikes when viewed head-on.