2003 Harley Davidson Fatboy Specifications

Harley-Davidson introduced the FLSTF Fat Boy to the Softail line for the 1990 model year. For 2001, Harley-Davidson added fuel injection to the Softail motorcycles and the designation on the Fat Boy became FLSTFI. The Fat Boy is one of the most distinctive Harleys. It has appeared in numerous movies and TV shows — Arnold Schwarzenegger rode one in “Terminator II” and John Travolta and Tim Allen took their Fat Boys cross country in “Wild Hogs.”

Engine Specs

The 2003 Harley-Davidson Fat Boy features an 88 cubic inch, or 1,450 cc, air-cooled twin cylinder engine with two valves per cylinder. The 2003 Fat Boy has Harley’s electronic sequential port fuel injection system and an electric starter.

Transmission Specs

Power is delivered to the rear wheel of the 2003 Fat Boy by a five-speed — one down, four up — transmission with a carbon fiber reinforced belt final drive. The clutch, as with most motorcycles, is a wet multi-plate model.


The 2003 Harley-Davidson Fat Boy is built around a steel double cradle frame. The 41.3-mm telescopic front fork provides front suspension while in the back the twin shocks are hidden under the engine to give the bike a hardtail look. This gives the Fat Boy a slightly harsh ride, especially over the bumps. Both front and rear brakes are dual piston calipers. The Fat Boy has rider floorboards with a heel-toe shifter. Electronics include a speedometer, odometer and trip meter.


The 2003 Fat Boy is 94.3 inches long with a wheelbase of 64.5 inches. It has a ground clearance of 5.1 inches and the rider sits 27.5 inches off the ground. Dry weight of the Fat Boy is 669 pounds and the fuel tank holds 5 gallons. The 2003 Harley-Davidson Fat Boy was offered in six colors.