2011 Harley-Davidson FLSTF Fat Boy Specifications

Name: 2011 Harley-Davidson FLSTF Fat Boy
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2011 Harley-Davidson FLSTF Fat Boy Overview

Harley-Davidson FLSTF Fat Boy is a custom / cruiser motorcycle, displacing 1584 cc. Power comes from 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. On the performance side, it delivers 124.7 Nm @ 3000 rpm of torque. On the road, the 2011 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. The full 2011 Harley-Davidson FLSTF Fat Boy spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2011 FLSTF Fat Boy - Pros & Cons

Strengths

Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Accessible seat height: A Laden 635 mm seat height keeps this manageable for most riders, which helps confidence at parking-lot speeds.
Large fuel range: A 18.9-litre tank means fewer stops on longer rides - a genuine plus for touring or a lengthy daily commute.
Low-maintenance final drive: Running Belt final drive cuts out the regular chain cleaning and tensioning that most bikes need.

Considerations

Age-related wear: Nothing specific stands out as a weak point on the FLSTF Fat Boy - the usual used-bike checks (service history, consumables, tyres) apply.

Wear Points & Servicing Notes

Heat management in traffic

Because the FLSTF Fat Boy relies on airflow rather than a coolant jacket, expect noticeably more radiant heat at low speed and in traffic. It's inherent to air cooling, and ventilated gear largely offsets it.

Fuelling & injector care

The Electronic Sequential Port Fuel Injection (ESPFI) on the FLSTF Fat Boy needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.

Brake disc and pad wear

Braking up front comes from Single 292mm disc 4 piston caliper - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The FLSTF Fat Boy's suspension runs 41.3 mm telescopic, chrome dust covers at the front. The rear uses Hidden, horizontal-mounted, coil-over shock. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The FLSTF Fat Boy runs belt final drive: no lubrication or frequent adjustment like a chain, though belt tension and wear are worth a periodic look.

Frame & chassis check

Built around a Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded, the FLSTF Fat Boy's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

Handling the weight at a standstill

329 kg puts the FLSTF Fat Boy toward the heavier end of its class. It's most noticeable at walking pace; once underway the mass settles into the handling rather than fighting it.

FLSTF Fat Boy - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2011 Harley-Davidson FLSTF Fat Boy, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy FLSTF Fat Boy should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects a FLSTF Fat Boy's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the FLSTF Fat Boy needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.

2011 Harley-Davidson FLSTF Fat Boy - Frequently Asked Questions

What engine does the 2011 Harley-Davidson FLSTF Fat Boy have?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy weigh?

The 2011 Harley-Davidson FLSTF Fat Boy weighs 329 kg. This is the manufacturer's wet figure.

How much power does the 2011 Harley-Davidson FLSTF Fat Boy make?

The 2011 Harley-Davidson FLSTF Fat Boy produces 124.7 Nm @ 3000 rpm of torque.

What is the fuel tank capacity of the 2011 Harley-Davidson FLSTF Fat Boy?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy suitable for shorter riders?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy have?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy use?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy have?

The 2011 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 2011 Harley-Davidson FLSTF Fat Boy Specifications

Year 2011

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.