2021 Harley-Davidson Softail Fat Boy 114 Specifications

Name: 2021 Harley-Davidson Softail Fat Boy 114
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2021 Harley-Davidson Softail Fat Boy 114 Overview

For 2021, Harley-Davidson offers the Softail Fat Boy 114 as a custom / cruiser motorcycle with 1868 cc on tap. The 2021 Harley-Davidson Softail Fat Boy 114 is built around a Four stroke, V-Twin, 2 Milwaukee-Eight 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder engine, a compression ratio of 10.5:1. Out on the road, the Softail Fat Boy 114 delivers 161 Nm @ 3000 of torque. In everyday use, the 2021 Softail Fat Boy 114 tips the scales at 317 kg, carries a 18.9-litre fuel tank, offers a seat height of Unladen 675 mm and spans a 1655 mm wheelbase. That's roughly 16.4 kg heavier than the average custom / cruiser motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2021 Harley-Davidson Softail Fat Boy 114 spec sheet below.

2021 Softail Fat Boy 114 - Pros & Cons

Strengths

Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Accessible seat height: At just Unladen 675 mm, flat-footing at a stop is easy for most riders - a genuine confidence builder for less experienced owners.
Large fuel range: With a 18.9-litre tank, this isn't a bike you'll be stopping for fuel every hour - a real asset on longer trips.
Low-maintenance final drive: Belt, 32/66 ratio final drive is about as close to maintenance-free as motorcycle drivetrains get.

Considerations

Age-related wear: No particular mechanical concern flags for the Softail Fat Boy 114 - condition on any used example comes down to how well it's been looked after.

Wear Points & Servicing Notes

Heat management in traffic

Air cooling on the Softail Fat Boy 114 keeps the mechanical layout simple, but heat management in slow traffic needs more attention than on a liquid-cooled bike - plan routes and gear accordingly in warmer conditions.

Fuelling & injector care

Fuelling on the Softail Fat Boy 114 comes from Electronic Sequential Port Fuel Injection (ESPFI). Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.

Brake disc and pad wear

2x 300mm discs, 4 piston fixed caliper up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.

Suspension condition on used examples

Suspension duties are handled by Dual bending valve 49mm telescopic with aluminum fork triple clamps, dual rate spring, "beer can" covers up front and Hidden, free piston, coil-over monoshock, 43mm stroke, toolless hydraulic preload adjustment at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.

Final drive maintenance

Belt final drive keeps day-to-day maintenance minimal on the Softail Fat Boy 114 - just periodic tension and wear checks rather than the regular cleaning a chain demands.

Frame & chassis check

The Mild steel, tubular frame, rectangular section backbone, stamped, cast, and forged junctions, MIG welded, aluminum forged fender supports chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.

Handling the weight at a standstill

The Softail Fat Boy 114's 317 kg kerb weight is worth factoring into how you handle it at a standstill - parking-lot manoeuvres need a bit more deliberate technique than on a lighter machine.

Softail Fat Boy 114 - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2021 Harley-Davidson Softail Fat Boy 114 should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept Softail Fat Boy 114 settles to a smooth idle within seconds.

Oil and filter changes

Oil changes are the cheapest insurance you can buy for a Softail Fat Boy 114's engine - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.

Fuel system care

Injector systems like the Softail Fat Boy 114's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.

2021 Harley-Davidson Softail Fat Boy 114 - Frequently Asked Questions

What engine does the 2021 Harley-Davidson Softail Fat Boy 114 have?

The 2021 Harley-Davidson Softail Fat Boy 114 uses a Four stroke, V-Twin, 2 Milwaukee-Eight 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder engine with 1868 cc of displacement. It is air cooled.

How much does the 2021 Harley-Davidson Softail Fat Boy 114 weigh?

The 2021 Harley-Davidson Softail Fat Boy 114 weighs 317 kg. This is the manufacturer's wet figure.

How much power does the 2021 Harley-Davidson Softail Fat Boy 114 make?

The 2021 Harley-Davidson Softail Fat Boy 114 produces 161 Nm @ 3000 of torque.

What is the fuel tank capacity of the 2021 Harley-Davidson Softail Fat Boy 114?

The 2021 Harley-Davidson Softail Fat Boy 114 has a 18.9-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 315-377 km between stops.

Is the 2021 Harley-Davidson Softail Fat Boy 114 suitable for shorter riders?

The 2021 Harley-Davidson Softail Fat Boy 114 has a seat height of Unladen 675 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2021 Harley-Davidson Softail Fat Boy 114 have?

The 2021 Harley-Davidson Softail Fat Boy 114 uses 2x 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 2021 Harley-Davidson Softail Fat Boy 114 use?

The 2021 Harley-Davidson Softail Fat Boy 114 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 2021 Harley-Davidson Softail Fat Boy 114 have?

The 2021 Harley-Davidson Softail Fat Boy 114 is fitted with a 6 Speed transmission.

Harley-Davidson Softail Fat Boy 114 Spec Evolution

The Harley-Davidson Softail Fat Boy 114 was produced across 2 model years (2019-2021). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification	2019	2021
Dry Weight	304 kg kg / 670 lbs	304 kg kg / 671 lbs
Engine Detail	Four stroke, V-Twin, 2 Milwaukee-Eight° 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder	Four stroke, V-Twin, 2 Milwaukee-Eight 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Seat Height	675 mm / 26.4 in	Unladen 675 mm / 26.6 in Laden 658 mm / 25.9 in
Displacement	1868 cc / 113.9 cu-in	1868 cc / 114 cu-in
Brakes - Front	2x Discs 4 piston caliper	2x 300mm discs, 4 piston fixed caliper
Brakes - Rear	Single disc 2 piston caliper	Single 292mm disc, 2 piston floating caliper
Suspension - Front	Showa Inverted forks	Dual bending valve 49mm telescopic with aluminum fork triple clamps, dual rate spring, "beer can" covers
Suspension - Rear	Mono shock adjustable	Hidden, free piston, coil-over monoshock, 43mm stroke, toolless hydraulic preload adjustment

Key Specifications

Engine

Four stroke, V-Twin, 2 Milwaukee-Eight 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder

Power

Not published by manufacturer

Torque

161 Nm / 119 lb-ft @ 3000

Top Speed

Not published by manufacturer

Weight

317 kg / 699 lbs

Fuel Capacity

18.9 Litres / US 5.0 gal

Full 2021 Harley-Davidson Softail Fat Boy 114 Specifications

Year 2020 - 21

Make Model Harley Davidson Softail Fat Boy 114

Seat Height Unladen 675 mm / 26.6 in Laden 658 mm / 25.9 in

Wheelbase 1655 mm / 65.6 in

Ground Clearance 115 mm / 4.5 in

Height 1095 mm / 43.1 in

Length 2370 mm / 93.3 in

Width 985 mm / 38.3 in

Dry Weight 304 kg kg / 671 lbs

Fuel Capacity 18.9 Litres / US 5.0 gal

Wet Weight 317 kg / 699 lbs

Max Torque 161 Nm / 119 lb-ft @ 3000

Displacement 1868 cc / 114 cu-in

Engine Detail Four stroke, V-Twin, 2 Milwaukee-Eight 114, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder

Bore x Stroke 102 x 114.3 mm

Compression Ratio 10.5:1

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

Clutch Mechanical, 10 plate wet, assist & conventional

Final Drive Belt, 32/66 ratio

Gear Ratios 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.79

Primary Drive Chain, 34/46 ratio

Transmission / Drive 6 Speed

Frame Type Mild steel, tubular frame, rectangular section backbone, stamped, cast, and forged junctions, MIG welded, aluminum forged fender supports

Suspension - Front Dual bending valve 49mm telescopic with aluminum fork triple clamps, dual rate spring, "beer can" covers

Suspension - Rear Hidden, free piston, coil-over monoshock, 43mm stroke, toolless hydraulic preload adjustment

Lean Angle 25.6°

Rake 30°

Swingarm Mild steel, tubular sections, stamped x-member, forged axle junctions, MIG welded, removable belt spacer

Trail 104 mm / 4.1 in

Wheel Travel - Front 130 mm / 5.1 in

Wheel Travel - Rear 86 mm / 3.4 in

Brakes - Front 2x 300mm discs, 4 piston fixed caliper

Brakes - Rear Single 292mm disc, 2 piston floating caliper

ABS Standard

Tyres - Front 160/60R18,70V,BW

Tyres - Rear 240/40R18,79V,BW

Wheels - Front 18 x 4,5 in

Wheels - Rear 18 x 8.0 in

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.