Cruisers

2006Harley-Davidson FLSTFI Fat Boy

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The 2006 Harley-Davidson FLSTFI Fat Boy is an iconic cruiser designed for riders seeking classic styling with modern reliability. Its 1442cc V-twin engine delivers strong low-end torque ideal for laid-back riding, while electronic fuel injection ensures dependable performance. Best known for its distinctive fat tires and timeless design, it appeals to cruiser enthusiasts valuing heritage and comfort.

Capacity: 1442.2 ccm
Engine: V-Twin
Gearbox: 5-speed
Dry weight: 309.8 kg
Seat height: Not on record
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Power: 67.0 HP (49.3 kW)

⇄ Compare with another bike All model years

What’s new for the 2006 Harley-Davidson FLSTFI Fat Boy

vs the 2005

Spec	2005	2006
Engine capacity	1449.0 ccm (88.42 cubic inches)	1442.2 ccm (88.01 cubic inches)
Torque	102.0 Nm (10.4 kgf-m or 75.2 ft.lbs)	115.3 Nm (11.8 kgf-m or 85.0 ft.lbs)
Dry weight	307.0 kg (676.8 pounds)	309.8 kg (683.0 pounds)
Wet weight	—	323.9 kg (714.1 pounds)
Seat height	645 mm (25.4 inches)	not listed
Wheelbase	1630 mm (64.2 inches)	1638 mm (64.5 inches)

Other years 2002 2003 2004 2005 2006

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering30%

City riding45%

Daily riding55%

Touring55%

Two-up55%

Track10%

Best for: Built for laid-back boulevard cruising and iconic Fat Boy style rather than outright performance.
Built for: A torque-rich, thumping V-twin cruiser that rewards relaxed, unhurried riding over twisty back roads.
Not ideal for: Not a good fit for riders seeking sharp cornering agility, off-road capability, or high-speed sport performance.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Full specifications

Engine

Capacity: 1442.2 ccm
Power: 67.0 HP (49.3 kW)
Torque: 115.3 Nm (11.8 kgf-m)
Engine type: V-Twin
Power/weight ratio: 0.2163 HP/kg
Bore x stroke: 95.3 x 101.6 mm
Compression: 8.8:1
Cooling system: Air
Fuel system: Injection
Valves per cylinder: 2

Transmission

Gearbox: 5-speed
Transmission type: Manual
Final drive: Belt
Clutch: Multi-plate clutch with diaphragm spring in oil bath

Dimensions & weight

Wheelbase: 1638 mm
Overall length: 2395 mm
Dry weight: 309.8 kg
Wet weight: 323.9 kg
Fuel capacity: 18.90 litres
Ground clearance: 130 mm
Seat height: Not on record - add it

Chassis & suspension

Rake (fork angle): 32.0°
Trail: 147 mm

Brakes & wheels

Front brakes: Single disc
Rear brakes: Single disc
Front tyre: MT90-B16
Rear tyre: 150/80-B16

Other

Color options: Vivid black, brilliant silver, black pearl, deep cobalt, glacier white pearl, yellow pearl, brandy wine sunglo, two-tone chopper blue and brilliant silver, two-tone black cherry and black pearl, two-tone fire red pearl and vivid black, two-tone deep cobal

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	2002	2003	2004	2005	2006
Capacity	1449 cc	1449 cc	1449 cc	1449 cc	1442 cc
Dry weight	320 kg	320 kg	307 kg	307 kg	310 kg
Seat height	699 mm	699 mm	645 mm	645 mm	—
Fuel capacity	18.9 L	19.7 L	18.9 L	18.9 L	18.9 L