The Harley-Davidson Fat Boy motorcycle specifications include a 1,337 cc (81.58 cu in) engine, power of 67 hp (48.9 kW) @ 5,000 rpm, a 5-speed gearbox, and a listed weight of 298 kg (657 lb).
Key specifications
The 1990 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Harley-Davidson Fat Boy compares
This compares the motorcycle with all Harley-Davidson models in this specifications database. The blue marker is this model and the grey line is the Harley-Davidson database average.
Very close to the Harley-Davidson database average. Around the 68th percentile across Harley-Davidson models.
Very close to the Harley-Davidson database average. Around the 55th percentile across Harley-Davidson models.
Very close to the Harley-Davidson database average. Around the 41st percentile across Harley-Davidson models.
Very close to the Harley-Davidson database average. Around the 40th percentile across Harley-Davidson models.
About 6% smaller than the Harley-Davidson database average. Around the 37th percentile across Harley-Davidson models.
Harley-Davidson database percentile rankings
Percentiles show where this motorcycle sits across the Harley-Davidson specifications database. They are descriptive database rankings, not performance ratings.
67 hp — more powerful than about 68% of Harley-Davidson models with power data.
1,337 cc — larger displacement than about 55% of Harley-Davidson models.
298 kg — heavier than about 41% of Harley-Davidson models, or lighter than about 59%.
675 mm — taller than about 40% of Harley-Davidson models.
16 L — larger than about 37% of Harley-Davidson fuel tanks in this database.
Dimensions compared with Harley-Davidson average
Each measurement is compared with the average value across Harley-Davidson models where that dimension is available.
2,370
2,376
Close to average.
1,665
1,054
58% above average.
1,085
1,208
10% below average.
675
689
Close to average.
Mechanical overview
Additional useful specifications
| Front tire size | 130/90-16 |
|---|---|
| Rear tire size | 130/90-16 |
| Front tire width | 130 mm |
| Front tire aspect ratio | 90% |
| Front rim diameter | 16 in |
| Rear tire width | 130 mm |
| Rear tire aspect ratio | 90% |
| Rear rim diameter | 16 in |
| Power-to-weight ratio | 0.225 hp/kg |
| Power-to-weight | 224.8 hp/tonne |
| Specific power | 50.1 hp/L |
| Bore/stroke ratio | 0.82:1 (Undersquare) |
Model information
| Category | Sport touring |
|---|
Engine specifications
| Engine type | V2, four-stroke |
|---|---|
| Displacement | 1,337 cc (81.58 cu in) |
| Power | 67 hp (48.9 kW) @ 5,000 rpm |
| Torque | 97.0 Nm (9.9 kgf-m or 71.5 ft.lbs) @ 2,350 rpm |
| Bore × stroke | 88.8 x 108 mm (3.5 x 4.3 inches) |
| Compression ratio | 8.5:1 |
| Valves per cylinder | 2.0 |
| Cooling system | Air |
| Fuel system | Carburettor |
| Fuel control | Overhead Valves (OHV) |
| Ignition | Analogue CDI |
| Starter | Electric |
| Lubrication | Dry sump |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Belt (final drive) |
| Clutch | Dry, multiple discs, cable operated |
Chassis and suspension
| Front suspension | 39mm Telescopic forks |
|---|---|
| Rear suspension | Dual remote shocks adjustable preload, |
Brakes, wheels and tires
| Front brakes | Single disc. Four-piston calipers. |
|---|---|
| Rear brakes | Single disc. Four-piston calipers. |
| Front tire | 130/90-16 |
| Rear tire | 130/90-16 |
Dimensions and weight
| Wet weight | 298 kg (657 lb) |
|---|---|
| Dry weight | 320 kg (705.5 lb) |
| Seat height | 675 mm (26.6 inches) |
| Overall length | 2,370 mm (93.3 inches) |
| Overall width | 1,665 mm (65.6 inches) |
| Overall height | 1,085 mm (42.7 inches) |
Fuel and emissions
| Fuel capacity | 16.00 L (4.23 US gal) |
|---|
Performance
| Top speed | 148.0 km/h (92.0 mph) |
|---|---|
| Power/weight ratio | 0.2094 hp/kg |
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Harley-Davidson models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Harley-Davidson information before relying on them. Visit the official Harley-Davidson website.