2021 Harley-Davidson Fat Boy 114 Specifications

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

Custom / cruiser • Specs last verified 13 July 2026

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2021 Harley-Davidson Fat Boy 114 Overview

For 2021, Harley-Davidson offers the Fat Boy 114 as a custom / cruiser motorcycle with 1868 cc on tap. The 2021 Harley-Davidson Fat Boy 114 is built around a V2, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 10.5:1. Internally, bore and stroke are 102 x 114 mm. Out on the road, the Fat Boy 114 delivers 161.4 Nm @ 3000 Revolutions of torque. In everyday use, the 2021 Fat Boy 114 tips the scales at 317.1 kg, carries a 18.93-litre fuel tank, offers a seat height of 658 mm and spans a 1666 mm wheelbase. That's roughly 16.5 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 Fat Boy 114 spec sheet below.

2021 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 658 mm, flat-footing at a stop is easy for most riders - a genuine confidence builder for less experienced owners.
Large fuel range: With a 18.93-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 (final drive) final drive is about as close to maintenance-free as motorcycle drivetrains get.

Considerations

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

Wear Points & Servicing Notes

Fuelling & injector care

Fuelling on the Fat Boy 114 comes from fuel injection. Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.

Valve clearance checks

Valve clearances on Double Overhead Cams/Twin Cam (DOHC)-equipped engines like the Fat Boy 114's drift slowly with mileage rather than failing suddenly - sticking to the service interval keeps it a non-issue.

Brake disc and pad wear

Double disc. ABS. 4-piston. 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 Telescopic fork up front and Twin shocks 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 Fat Boy 114 - just periodic tension and wear checks rather than the regular cleaning a chain demands.

Handling the weight at a standstill

The Fat Boy 114's 317.1 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.

Fat Boy 114 - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2021 Harley-Davidson 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 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 Fat Boy 114's engine - keep to the manufacturer's interval rather than stretching it. The sump holds 4.70 litres, so budget for that volume of quality motorcycle-specific engine oil. Use the viscosity grade the manual specifies, not whatever's on sale.

Fuel system care

Injector systems like the 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.

Valve clearance service

There's no reliable seat-of-the-pants way to tell if a Fat Boy 114's valve clearances are in spec - a light top-end tick is the only real warning sign, and by then some wear has already happened. Service records are the only proof.

2021 Harley-Davidson Fat Boy 114 - Frequently Asked Questions

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

The 2021 Harley-Davidson Fat Boy 114 uses a V2, four-stroke engine with 1868 cc of displacement.

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

The 2021 Harley-Davidson Fat Boy 114 weighs 317.1 kg. This is the manufacturer's wet figure.

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

The 2021 Harley-Davidson Fat Boy 114 produces 161.4 Nm @ 3000 Revolutions of torque.

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

The 2021 Harley-Davidson Fat Boy 114 has a 18.93-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 315-378 km between stops.

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

The 2021 Harley-Davidson Fat Boy 114 has a seat height of 658 mm. This is a comfortable, accessible height for most riders.

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

The 2021 Harley-Davidson Fat Boy 114 uses Double disc. ABS. 4-piston. at the front and Single disc. ABS. 2-piston. at the rear.

What tyre sizes does the 2021 Harley-Davidson Fat Boy 114 use?

The front tyre size on the 2021 Harley-Davidson Fat Boy 114 is 160/60-R18.

How much oil does the 2021 Harley-Davidson Fat Boy 114 take?

The 2021 Harley-Davidson Fat Boy 114 takes 4.70 litres of engine oil at a full oil and filter change. Always verify against the dipstick or sight glass after filling.

Harley-Davidson Fat Boy 114 Spec Evolution

The Harley-Davidson Fat Boy 114 was produced across 4 model years (2020-2023). 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	2020	2021	2022	2023
Wet Weight	306.0 kg / 674.6 lbs	317.1 kg / 699.0 lbs	317.1 kg / 699.0 lbs	317.1 kg / 699.0 lbs
Dry Weight	296 kg / 652.6 lbs	304.4 kg / 671.0 lbs	304.4 kg / 671.0 lbs	304.4 kg / 671.0 lbs
Engine Detail	Milwaukee-Eight® 114 engine	Milwaukee-Eight® 114	Milwaukee-Eight® 114	Milwaukee-Eight® 114
Seat Height	710 mm / 28.0 in.	658 mm / 25.9 in.	658 mm / 25.9 in.	658 mm / 25.9 in.
Fuel Capacity	13.60 litres / 3.59 US gallons	18.93 litres / 5.00 US gallons	18.93 litres / 5.00 US gallons	18.93 litres / 5.00 US gallons
Oil Capacity (Quarts)	3.49 US quarts	4.97 US quarts	4.97 US quarts	4.97 US quarts
Oil Capacity (l)	3.30 litres	4.70 litres	4.70 litres	4.70 litres
Ground Clearance (mm)	120 mm	114 mm	114 mm	114 mm

Key Specifications

Engine

V2, four-stroke

Power

Not published by manufacturer

Torque

161.4 Nm (16.5 kgf-m or 119.0 ft.lbs) @ 3000 Revolutions

Top Speed

Not published by manufacturer

Weight

317.1 kg / 699.0 lbs

Fuel Capacity

18.93 litres / 5.00 US gallons

Full 2021 Harley-Davidson Fat Boy 114 Specifications

Colours Vivid Black, Deadwood Green, Black Jack Metallic, Gauntlet Grey Metallic/Vivid Black

Ground Clearance (in.) 4.5 inches

Ground Clearance (mm) 114 mm

Seat Height 658 mm / 25.9 in.

Wheelbase 1666 mm / 65.6 in.

Length 2385 mm / 93.9 in.

Oil Capacity (l) 4.70 litres

Oil Capacity (Quarts) 4.97 US quarts

Dry Weight 304.4 kg / 671.0 lbs

Fuel Capacity 18.93 litres / 5.00 US gallons

Wet Weight 317.1 kg / 699.0 lbs

Max Torque 161.4 Nm (16.5 kgf-m or 119.0 ft.lbs) @ 3000 Revolutions

Power-to-Weight Ratio 0.3286 HP/kg

Bore x Stroke (in,) 4.0 x 4.5 inches

Bore x Stroke (mm) 102.0 x 114.0 mm

CO2 116.0 CO2 g/km. (CO2 - Carbon dioxide emission)

Displacement (cc) 1868.0 cc

Displacement (ci) 113.99 cubic inches

Engine Type V2, four-stroke

Fuel Control Double Overhead Cams/Twin Cam (DOHC)

Engine Detail Milwaukee-Eight® 114

Fuel System Injection. Electronic Sequential Port Fuel Injection

Compression Ratio 10.5:1

Exhaust 2-into-1-into-2 dual side; catalyst in header

Fuel Consumption 5.00 litres/100 km (20.0 km/l or 47.04 mpg)

Starter Electric

Clutch Multi-plate with diaphragm spring in oil bath

Final Drive Belt (final drive)

Gearbox 6-speed

Primary Drive Primary chain, 34/46 ratio

Suspension - Front Telescopic fork

Suspension - Rear Twin shocks

Rake 30.0°

Trail 104 mm / 4.1 in.

Instrumentation 5-inch analog speedometer with digital gear, odometer, fuel level, clock, trip, range and tachometer indication

Lighting system High beam, neutral, low oil pressure, turn signals, engine diagnostics, security system (optional), 6-speed, low fuel warnings

Brakes - Front Double disc. ABS. 4-piston.

Brakes - Rear Single disc. ABS. 2-piston.

Rims Machined, Lakester cast aluminum

Tyres - Front 160/60-R18

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