User Rating: /5 · No user ratings yet✓ Your rating was saved
MotoLibrary Score
64/100Sporty
Power/Weight
0.34 hp/kg
Torque
171 Nm
Engine
1917 ccm
Technical Overview
2025 Harley-Davidson Fat Boy 117 Technical Analysis & Specification Breakdown
At the heart of the 2025 Harley-Davidson Fat Boy 117 custom - cruiser motorcycle, Harley-Davidson features a 1917.4 cc (117 cu in) air-cooled v2, four-stroke configuration. In factory specification, peak output is rated at 104 HP (75.9 kW) at 4,800 rpm while maximum torque reaches 170.9 Nm (126 lb-ft) at 3,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and belt final drive. With a specific output of 54.2 HP per liter and a 1,800 rpm working window between peak torque (3,000 rpm) and peak power (4,800 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Fat Boy 117 measures 314.8 kg (694 lbs) wet (curb), translating to a power-to-weight ratio of 0.33 HP/kg (3.03 kg per horsepower). Rider ergonomics and chassis geometry center around a 658 mm (25.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,651 mm (65 in) wheelbase engineered for planted straight-line stability. The 18.93-liter (5 US gal) fuel tank paired with a rated consumption of 5 L/100 km provides an estimated theoretical range of roughly 379 km (235 miles) between fill-ups.
Specific Output
54.2 HP/L
Power-to-Weight
0.33 HP/kg (3.03 kg/HP)
Power Band Window
3,000–4,800 rpm
Theoretical Range
~379 km (235 mi)
Engine
Displacement1917.4 ccm (117.00 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsMilwaukee-Eight® 117
Power104.0 HP (75.9 kW)) @ 4800 RPM
Torque170.9 Nm (17.4 kgf-m or 126.0 ft.lbs) @ 3000 RPM
Compression10.3:1
Bore x Stroke102.0 x 114.0 mm (4.0 x 4.5 inches)
Fuel SystemInjection. Electronic Sequential Port Fuel Injection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingAir
Transmission
Gearbox6-speed
Final DriveBelt (final drive)
ClutchMulti-plate with diaphragm spring in oil bath
Driveline34/46 ratio primary
Performance
Fuel Consumption5.00 litres/100 km (20.0 km/l or 47.04 mpg)
Greenhouse Gases116.0 CO2 g/km. (CO2 - Carbon dioxide emission)
Exhaust2-into-2 staggered, catalyst in muffler
Chassis
Rake30.0°
Trail104 mm (4.1 inches)
Front SuspensionDual-bending valve 49 mm telescopic with aluminum fork triple clamps; dual rate spring; ´beer can´ covers
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
