2010 Harley-Davidson FLSTF Fat Boy Specifications

Name: 2010 Harley-Davidson FLSTF Fat Boy
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2010 Harley-Davidson FLSTF Fat Boy Overview

The 2010 Harley-Davidson FLSTF Fat Boy is a custom / cruiser motorcycle built around 1584 cc of displacement. Under the tank sits a Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder engine, a compression ratio of 9.2:1. 2010 Harley-Davidson FLSTF Fat Boy delivers 124.7 Nm @ 3000 rpm of torque. From a practical standpoint, the 2010 FLSTF 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 1715 mm wheelbase. That's roughly 28.4 kg heavier than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2010 Harley-Davidson FLSTF Fat Boy spec sheet covering every technical detail from suspension travel to tyre sizes.

2010 FLSTF 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 FLSTF Fat Boy, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.

Wear Points & Servicing Notes

Heat management in traffic

FLSTF 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 Single 292mm disc 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 FLSTF 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 FLSTF 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.

FLSTF Fat Boy - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2010 Harley-Davidson FLSTF 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 FLSTF 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 FLSTF 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 FLSTF 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.

2010 Harley-Davidson FLSTF Fat Boy - Frequently Asked Questions

What engine does the 2010 Harley-Davidson FLSTF Fat Boy have?

The 2010 Harley-Davidson FLSTF Fat Boy uses a Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder engine with 1584 cc of displacement. It is air cooled.

How much does the 2010 Harley-Davidson FLSTF Fat Boy weigh?

The 2010 Harley-Davidson FLSTF Fat Boy weighs 329 kg. This is the manufacturer's wet figure.

How much power does the 2010 Harley-Davidson FLSTF Fat Boy make?

The 2010 Harley-Davidson FLSTF Fat Boy produces 124.7 Nm @ 3000 rpm of torque.

What is the fuel tank capacity of the 2010 Harley-Davidson FLSTF Fat Boy?

The 2010 Harley-Davidson FLSTF 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 2010 Harley-Davidson FLSTF Fat Boy suitable for shorter riders?

The 2010 Harley-Davidson FLSTF Fat Boy has a seat height of Laden 635 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2010 Harley-Davidson FLSTF Fat Boy have?

The 2010 Harley-Davidson FLSTF Fat Boy uses Single 292mm disc 4 piston caliper at the front and Single 292mm disc 4 piston caliper at the rear.

What tyre sizes does the 2010 Harley-Davidson FLSTF Fat Boy use?

The 2010 Harley-Davidson FLSTF Fat Boy runs 140/75R17 front and 200/55R17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2010 Harley-Davidson FLSTF Fat Boy have?

The 2010 Harley-Davidson FLSTF Fat Boy is fitted with a 6 Speed transmission.

Harley-Davidson FLSTF Fat Boy Spec Evolution

The Harley-Davidson FLSTF Fat Boy was produced across 8 model years (1995-2012). 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	1995	1998	2007	2008	2009	2010	2011	2012
Wet Weight	320 kg / 706 lbs	320 kg / 706 lbs	329.0 kg / 725 lbs	329.0 kg / 725 lbs	329.0 kg / 725 lbs	329.0 kg / 725 lbs	329.0 kg / 725 lbs	329 kg / 725 lbs
Engine Detail	Four stroke, 45° V-Twin, OHV, 2 valves per cylinder.	Four stroke, 45° V-Twin, OHV, 2 valves per cylinder.	Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder	Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder	Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder	Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder	Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder	Four stroke, V-Twin, Twin Cam 103B Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, two valves per cylinder, with Integrated Oil-Cooler
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	Laden 635 mm / 25.0 in Unladen 690 mm / 27.1 in
Fuel Capacity	19 Litres / 5.0 US gal	19 Litres / 5.0 US gal	18.9 Litres / 5.0 gal	18.9 Litres / 5.0 gal	18.9 Litres / 5.0 gal	18.9 Litres / 5.0 gal	18.9 Litres / 5.0 gal	18.9 Litres / 5.0 US gal
Displacement	1337 cc / 81.5 cu-in	1337 cc / 81.5 cu-in	1584 cc / 96 cu-in	1584 cc / 96 cu-in	1584 cc / 96 cu-in	1584 cc / 96 cu-in	1584 cc / 96 cu-in	1690 cc / 103.1 cub in.
Wheelbase	-	-	1715 mm / 67.5 in	1715 mm / 67.5 in	1715 mm / 67.5 in	1715 mm / 67.5 in	1715 mm / 67.5 in	1635 mm / 64.2 in
Brakes - Front	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292 mm disc, 4 piston caliper
Brakes - Rear	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292mm disc 4 piston caliper	Single 292 mm disc, 2 piston caliper

Key Specifications

Engine

Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder

Power

Not published by manufacturer

Torque

124.7 Nm / 92 ft. lbs @ 3000 rpm

Top Speed

Not published by manufacturer

Weight

329.0 kg / 725 lbs

Fuel Capacity

18.9 Litres / 5.0 gal

Full 2010 Harley-Davidson FLSTF Fat Boy Specifications

Year 2010

Make Model Harley Davidson FLSTF Fat Boy

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

Wheelbase 1715 mm / 67.5 in

Length 2445 mm / 96.2 in

Fuel Capacity 18.9 Litres / 5.0 gal

Maximum Load / GVWR 526.0 kg / 1160 lbs

Wet Weight 329.0 kg / 725 lbs

Max Torque 124.7 Nm / 92 ft. lbs @ 3000 rpm

Displacement 1584 cc / 96 cu-in

Engine Detail Four stroke, Twin Cam 96BTM Valves Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder

Bore x Stroke 95.25 x 111.25 mm

Compression Ratio 9.2:1

Cooling System Air cooled

Fuel Induction Electronic Sequential Port Fuel Injection (ESPFI)

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

Starter Electric

Clutch Multi-plate, wet

Final Drive Belt

Gear Ratios 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.790

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 31.6°

Trail 147 mm / 5.7 in

Brakes - Front Single 292mm disc 4 piston caliper

Brakes - Rear Single 292mm disc 4 piston caliper

Tyres - Front 140/75R17

Tyres - Rear 200/55R17

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