2025 Harley-Davidson Softail Fat Boy 117 Specifications

Name: 2025 Harley-Davidson Softail Fat Boy 117
Brand: Harley-Davidson

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2025 Harley-Davidson Softail Fat Boy 117 Overview

The 2025 Harley-Davidson Softail Fat Boy 117 is a custom / cruiser motorcycle built around 1923 cc of displacement. Under the tank sits a Four stroke, V-Twin, 2 Milwaukee-Eight 117 custom, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder engine, a compression ratio of 10.3:1. 2025 Harley-Davidson Softail Fat Boy 117 delivers 77 kW @ 4800 rpm of peak power and 171 Nm @ 3000 rpm of torque. From a practical standpoint, the 2025 Softail Fat Boy 117 tips the scales at 315 kg, carries a 18.9-litre fuel tank, offers a seat height of Unladen 675 mm and spans a 1650 mm wheelbase. Scroll down for the complete 2025 Harley-Davidson Softail Fat Boy 117 spec sheet covering every technical detail from suspension travel to tyre sizes.

2025 Softail Fat Boy 117 - Pros & Cons

Strengths

Strong power output: 2025 Harley-Davidson Softail Fat Boy 117 makes 77 kW @ 4800 rpm with 171 Nm @ 3000 rpm of torque - competitive figures for its class.
Accessible seat height: At Unladen 675 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.

Considerations

Age-related wear: As with any used Softail Fat Boy 117, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.

Owner Experiences & Common Issues

Low-speed confidence

At 315 kg, the Softail Fat Boy 117 is a substantial machine. New owners occasionally mention that slow-speed manoeuvring in car parks takes a little getting used to. Once moving, the weight disappears - but practising slow-speed exercises builds confidence quickly.

Softail Fat Boy 117 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2025 Harley-Davidson Softail Fat Boy 117, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained Softail Fat Boy 117 should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task on any Softail Fat Boy 117. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.

2025 Harley-Davidson Softail Fat Boy 117 - Frequently Asked Questions

What engine does the 2025 Harley-Davidson Softail Fat Boy 117 have?

The 2025 Harley-Davidson Softail Fat Boy 117 uses a Four stroke, V-Twin, 2 Milwaukee-Eight 117 custom, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder engine with 1923 cc of displacement. It is air cooled.

How much does the 2025 Harley-Davidson Softail Fat Boy 117 weigh?

The 2025 Harley-Davidson Softail Fat Boy 117 weighs 315 kg. This is the manufacturer's wet figure.

How much power does the 2025 Harley-Davidson Softail Fat Boy 117 make?

The 2025 Harley-Davidson Softail Fat Boy 117 produces 77 kW @ 4800 rpm of power and 171 Nm @ 3000 rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2025 Harley-Davidson Softail Fat Boy 117?

The 2025 Harley-Davidson Softail Fat Boy 117 has a 18.9-litre fuel tank.

Is the 2025 Harley-Davidson Softail Fat Boy 117 suitable for shorter riders?

The 2025 Harley-Davidson Softail Fat Boy 117 has a seat height of Unladen 675 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2025 Harley-Davidson Softail Fat Boy 117 have?

The 2025 Harley-Davidson Softail Fat Boy 117 uses 2 x 300mm discs, 4 piston fixed caliper at the front and Single 292mm disc, 2 piston floating caliper at the rear.

What tyre sizes does the 2025 Harley-Davidson Softail Fat Boy 117 use?

The 2025 Harley-Davidson Softail Fat Boy 117 runs 160/60R18,70V,BW front and 240/40R18,79V,BW rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2025 Harley-Davidson Softail Fat Boy 117 have?

The 2025 Harley-Davidson Softail Fat Boy 117 is fitted with a 6 Speed transmission.

Key Specifications

Engine

Four stroke, V-Twin, 2 Milwaukee-Eight 117 custom, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder

Power

77 kW / 104Hp @ 4800 rpm

Torque

171 Nm / 126 lb-ft @ 3000 rpm

Top Speed

N/A

Weight

315 kg / 694 lbs

Fuel Capacity

18.9 Litres / US 5.0 gal

Full 2025 Harley-Davidson Softail Fat Boy 117 Specifications

Year 2025

Make Model Harley Davidson Softail Fat Boy 117

Max Power 77 kW / 104Hp @ 4800 rpm

Max Torque 171 Nm / 126 lb-ft @ 3000 rpm

Displacement 1923 cc / 117 cu in

Engine Detail Four stroke, V-Twin, 2 Milwaukee-Eight 117 custom, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder

Bore x Stroke 103.5 x 114.3 in

Compression Ratio 10.3:1

Cooling System Air cooled

Exhaust 2-into-2 staggered, catalyst in muffler

Fuel Induction Electronic Sequential Port Fuel Injection (ESPFI)

Ignition Single-fire, non-wasted, map-controlled spark ignition

Lubrication Pressurized, dry-sump with oil cooler

Starter Electric