| MODEL | HARLEY-DAVIDSON SOFTAIL FAT BOY FLSTF 1990 - 1995 |
| Year | 1990 - 1995 |
| Engine Type | Air-cooled 45° V-twin, Evolution, OHV, 2 valves per cylinder |
| Displacement / Capacity | 1337 cc / 81.5 cu in |
| Bore X Stroke | 88.8 x 108 mm |
| Compression Ratio | 8.5:1 |
| Cooling System | Air cooled |
| Max Power | 41.2 kW / 56 hp @ 5000 rpm |
| Max Torque | 97 Nm / 71.5 lb-ft @ 2350 rpm |
| Ignition | — |
| Induction | 38 mm Keihin carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 5-speed |
| Clutch | — |
| Final Drive | Belt |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 39 mm telescopic fork |
| Rear Suspension | Twin shocks, adjustable preload |
| Front Brakes | Single 292 mm disc, 4-piston caliper |
| Rear Brakes | Single 292 mm disc, 4-piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 680 mm / 26.8 in |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 298 kg / 657 lbs |
| Wet Weight | 320 kg / 706 lbs |
| WHEEL SPECS | |
| Front Tyre | 130/90-16 |
| Rear Tyre | 130/90-16 |
| FUEL SYSTEM | |
| Fuel Capacity | 15.9 Litres / 4.2 US gal |
| Fuel Consumption | — |
| Top Speed | 155 km/h / 96 mph |
The Fat Boy grew out of factory show bikes taken to Daytona Bike Week in 1988 and 1989 and went on sale as a 1990 model, quickly becoming one of Harley-Davidson's best sellers. Its look was built on solid-disc cast wheels front and rear, a wide FL front end, fat 16-inch tyres, shotgun-style exhausts and winged tank badges, over a Softail chassis whose hidden shocks imitate a hardtail. The first bikes were all silver; from 1991 a different colour was offered each year, and the exhaust was made seamless for 1994.
