2020 Harley-Davidson Fat Boy 114 Specifications

Name: 2020 Harley-Davidson Fat Boy 114
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2020 Harley-Davidson Fat Boy 114 Overview

The 2020 Harley-Davidson Fat Boy 114 is a custom / cruiser motorcycle built around 1868 cc of displacement. Under the tank sits a V2, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 10.5:1. The bore and stroke measures 102 x 114 mm. 2020 Harley-Davidson Fat Boy 114 delivers 160 Nm @ 3500 Revolutions of torque. From a practical standpoint, the 2020 Fat Boy 114 tips the scales at 306 kg, carries a 13.60-litre fuel tank, offers a seat height of 710 mm and spans a 1690 mm wheelbase. That's roughly 5.4 kg heavier than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2020 Harley-Davidson Fat Boy 114 spec sheet covering every technical detail from suspension travel to tyre sizes.

2020 Fat Boy 114 - Pros & Cons

Strengths

Fuel injection: The fuel injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Accessible seat height: At 710 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.
Low-maintenance final drive: Belt (final drive) final drive means no chain to clean, lube or adjust - meaningfully less routine maintenance than a chain-driven equivalent.

Considerations

Age-related wear: As with any used Fat Boy 114, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.

Wear Points & Servicing Notes

Fuelling & injector care

Fuelling comes from fuel injection. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.

Valve clearance checks

Double Overhead Cams/Twin Cam (DOHC) valve actuation on the Fat Boy 114 means clearances should be checked at the manufacturer's specified interval - they can tighten as mileage accumulates, and a light top-end tick is usually the first sign.

Brake disc and pad wear

The Double disc. ABS. 4-piston. front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.

Suspension condition on used examples

Up front, the Fat Boy 114 runs Telescopic fork and Twin shocks at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.

Final drive maintenance

Final drive is by belt - lower maintenance than chain with no lubrication needed, but tension and tooth wear should still be checked at service intervals.

Handling the weight at a standstill

At 306 kg, the Fat Boy 114 is a substantial machine - low-speed manoeuvring in car parks takes more physical effort than on a lighter bike, though the weight disappears once rolling.

Fat Boy 114 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2020 Harley-Davidson Fat Boy 114, 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 Fat Boy 114 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 Fat Boy 114. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. The sump holds 3.30 litres, so budget for that volume of quality motorcycle-specific engine oil. Always use the correct viscosity grade as specified in the owner's manual.

Fuel system care

The Fat Boy 114's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.

Valve clearance service

Check that valve clearances have been adjusted at the correct intervals on any used Fat Boy 114. A bike with clearances out of spec doesn't always feel obviously wrong - but tight clearances accelerate valve seat wear. Ask for service documentation proving it's been done.

2020 Harley-Davidson Fat Boy 114 - Frequently Asked Questions

What engine does the 2020 Harley-Davidson Fat Boy 114 have?

The 2020 Harley-Davidson Fat Boy 114 uses a V2, four-stroke engine with 1868 cc of displacement.

How much does the 2020 Harley-Davidson Fat Boy 114 weigh?

The 2020 Harley-Davidson Fat Boy 114 weighs 306 kg. This is the manufacturer's wet figure.

How much power does the 2020 Harley-Davidson Fat Boy 114 make?

The 2020 Harley-Davidson Fat Boy 114 produces 160 Nm @ 3500 Revolutions of torque.

What is the fuel tank capacity of the 2020 Harley-Davidson Fat Boy 114?

The 2020 Harley-Davidson Fat Boy 114 has a 13.60-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 226-272 km between stops.

Is the 2020 Harley-Davidson Fat Boy 114 suitable for shorter riders?

The 2020 Harley-Davidson Fat Boy 114 has a seat height of 710 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2020 Harley-Davidson Fat Boy 114 have?

The 2020 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 2020 Harley-Davidson Fat Boy 114 use?

The front tyre size on the 2020 Harley-Davidson Fat Boy 114 is 150/80-16.

How much oil does the 2020 Harley-Davidson Fat Boy 114 take?

The 2020 Harley-Davidson Fat Boy 114 takes 3.30 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

160.0 Nm (16.3 kgf-m or 118.0 ft.lbs) @ 3500 Revolutions

Top Speed

Not published by manufacturer

Weight

306.0 kg / 674.6 lbs

Fuel Capacity

13.60 litres / 3.59 US gallons

Full 2020 Harley-Davidson Fat Boy 114 Specifications

Colours Vivid Black, Barracuda Silver Denim, Black Denim, Performance Orange, River Rock Grey Denim, Stilleto Red

Ground Clearance (in.) 4.7 inches

Ground Clearance (mm) 120 mm

Seat Height 710 mm / 28.0 in.

Wheelbase 1690 mm / 66.5 in.

Length 2340 mm / 92.1 in.

Oil Capacity (l) 3.30 litres

Oil Capacity (Quarts) 3.49 US quarts

Dry Weight 296 kg / 652.6 lbs

Fuel Capacity 13.60 litres / 3.59 US gallons

Wet Weight 306.0 kg / 674.6 lbs

Max Torque 160.0 Nm (16.3 kgf-m or 118.0 ft.lbs) @ 3500 Revolutions

Power-to-Weight Ratio 0.3378 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 engine

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 28.0°

Trail 132 mm / 5.2 in.

Instrumentation Tank-mounted electronic speedometer with odometer, time-of-day clock on odometer, dual tripmeter, RPM/gear display, fuel gauge with low fuel warning light and countdown feature, low oil pressure indicator light, engine diagnostics readout, LED indicator l

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 Denim black, structure cast aluminum with laser etched graphics

Tyres - Front 150/80-16

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