2013 Harley-Davidson Softail Fat Boy Specifications

Name: 2013 Harley-Davidson Softail Fat Boy
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2013 Harley-Davidson Softail Fat Boy Overview

The 2013 Harley-Davidson Softail Fat Boy is a custom / cruiser motorcycle built around 1690 cc of displacement. Under the tank sits a Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler engine, a compression ratio of 9.6:1. 2013 Harley-Davidson Softail Fat Boy delivers 134 Nm @ 3500 rpm of torque. From a practical standpoint, the 2013 Softail Fat Boy tips the scales at 329 kg, carries a 18.9-litre fuel tank, offers a seat height of Laden 635 mm and spans a 1635 mm wheelbase. That's roughly 28.4 kg heavier than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2013 Harley-Davidson Softail Fat Boy spec sheet covering every technical detail from suspension travel to tyre sizes.

2013 Softail Fat Boy - Pros & Cons

Strengths

Fuel injection: The Electronic Sequential Port Fuel Injection (ESPFI) system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Accessible seat height: At Laden 635 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.
Large fuel range: The 18.9-litre tank is generously sized, translating to extended range between stops - ideal for touring or longer commutes.
Low-maintenance final drive: Belt 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 Softail Fat Boy, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.

Wear Points & Servicing Notes

Heat management in traffic

Softail Fat Boy's air-cooled design means engine-bay temperatures build up more in stop-start traffic than on a liquid-cooled equivalent - a function of the cooling method itself, not a defect. Mesh riding gear and avoiding prolonged idling help in hot climates.

Fuelling & injector care

Fuelling comes from Electronic Sequential Port Fuel Injection (ESPFI). 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.

Brake disc and pad wear

The 2x Discs 4 piston caliper 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 Softail Fat Boy runs 41.3 mm telescopic, chrome dust covers and Hidden, horizontal-mounted, coil-over shock 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.

Frame & chassis check

The frame is Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.

Handling the weight at a standstill

At 329 kg, the Softail Fat Boy 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.

Softail Fat Boy - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2013 Harley-Davidson Softail Fat Boy, 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 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. 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.

Fuel system care

The Softail Fat Boy'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.

2013 Harley-Davidson Softail Fat Boy - Frequently Asked Questions

What engine does the 2013 Harley-Davidson Softail Fat Boy have?

The 2013 Harley-Davidson Softail Fat Boy uses a Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler engine with 1690 cc of displacement. It is air cooled.

How much does the 2013 Harley-Davidson Softail Fat Boy weigh?

The 2013 Harley-Davidson Softail Fat Boy weighs 329 kg. This is the manufacturer's wet figure.

How much power does the 2013 Harley-Davidson Softail Fat Boy make?

The 2013 Harley-Davidson Softail Fat Boy produces 134 Nm @ 3500 rpm of torque.

What is the fuel tank capacity of the 2013 Harley-Davidson Softail Fat Boy?

The 2013 Harley-Davidson Softail Fat Boy 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 2013 Harley-Davidson Softail Fat Boy suitable for shorter riders?

The 2013 Harley-Davidson Softail Fat Boy has a seat height of Laden 635 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2013 Harley-Davidson Softail Fat Boy have?

The 2013 Harley-Davidson Softail Fat Boy uses 2x Discs 4 piston caliper at the front and Single disc 2 piston caliper at the rear.

What tyre sizes does the 2013 Harley-Davidson Softail Fat Boy use?

The 2013 Harley-Davidson Softail Fat Boy runs 140/75R17 67V front and 200/55R17 78V rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2013 Harley-Davidson Softail Fat Boy have?

The 2013 Harley-Davidson Softail Fat Boy is fitted with a 6 Speed transmission.

Harley-Davidson Softail Fat Boy Spec Evolution

The Harley-Davidson Softail Fat Boy was produced across 6 model years (2013-2018). 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	2013	2014	2015	2016	2017	2018
Wet Weight	329 kg / 725 lbs	329 kg / 725 lbs	329 kg / 725 lbs	331 kg / 730 lbs	332 kg / 733 lbs	317 kg / 699 lbs
Dry Weight	-	-	-	320 kg / 705 lbs	319 kg / 704 lbs	304 kg kg / 670 lbs
Engine Detail	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler	Four stroke, V-Twin, Milwaukee-Eight 107, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Seat Height	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in	675 mm / 26.4 in
Fuel Capacity	18.9 Litres / 5.0 US gal	18.9 Litres / 5.0 US gal	18.9 Litres / 5.0 US gal	18.9 Litres / US 5.0 gal	18.9 Litres / US 5.0 gal	18.9 Litres / 5.0 US gal
Displacement	1690 cc / 103.1 cub in.	1690 cc / 103.1 cub in.	1690 cc / 103.1 cub in.	1690 cc / 103.1 cub in.	1690 cc / 103.1 cub in.	1746 cc / 107 cub in
Wheelbase	1635 mm / 64.2 in	1635 mm / 64.2 in	1635 mm / 64.2 in	1635 mm / 64.2 in	1630 mm / 64.2 in	1655 mm / 65.6 in
Ground Clearance	-	-	-	130 mm / 5.1 in	120 mm / 4.7 in	115 mm / 4.5 in

Key Specifications

Engine

Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler

Power

Not published by manufacturer

Torque

134 Nm / 13.7 kgf-m / 98.8 ft. lbs @ 3500 rpm

Top Speed

Not published by manufacturer

Weight

329 kg / 725 lbs

Fuel Capacity

18.9 Litres / 5.0 US gal

Full 2013 Harley-Davidson Softail Fat Boy Specifications

Year 2013

Make Model Harley Davidson Softail Fat Boy

Seat Height Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in

Wheelbase 1635 mm / 64.2 in

Length 2396 mm / 94.3 in

Fuel Capacity 18.9 Litres / 5.0 US gal

Maximum Load / GVWR 526.0 kg / 1160 lbs

Oil Capacity 3.3 Litres

Wet Weight 329 kg / 725 lbs

Max Torque 134 Nm / 13.7 kgf-m / 98.8 ft. lbs @ 3500 rpm

Displacement 1690 cc / 103.1 cub in.

Engine Detail Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler

Bore x Stroke 98.4 x 111.1 mm

Compression Ratio 9.6:1

Cooling System Air cooled

Exhaust Chrome, over/under shotgun exhaust with dual mufflers

Fuel Induction Electronic Sequential Port Fuel Injection (ESPFI)

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

Starter Electric

Final Drive Belt

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

Transmission / Drive 6 Speed

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

Suspension - Front 41.3 mm telescopic, chrome dust covers

Suspension - Rear Hidden, horizontal-mounted, coil-over shock

Rake 31°

Trail 147 mm / 5.8 in

Brakes - Front 2x Discs 4 piston caliper

Brakes - Rear Single disc 2 piston caliper

Tyres - Front 140/75R17 67V

Tyres - Rear 200/55R17 78V

Wheels Optional Style Type Mirror Polished Chrome, Bullet Hole Disc Cast Aluminum (front and rear)

Wheels - Front Silver, Bullet Hole Disc Cast Aluminum

Wheels - Rear Silver, Bullet Hole Disc Cast Aluminum

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