Cruisers

2004Harley-Davidson FLSTFI Fat Boy

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The 2004 Harley-Davidson FLSTFI Fat Boy is an iconic cruiser designed for riders seeking classic American styling with modern fuel injection reliability. Its 1449cc V-twin engine delivers substantial low-end torque ideal for relaxed highway cruising and commanding presence. Best known for its distinctive fat tire design and timeless retro aesthetics, it appeals to experienced riders valuing comfort and heritage.

Capacity: 1449.0 ccm
Engine: V-Twin
Gearbox: 5-speed
Dry weight: 307.0 kg
Seat height: 645 mm
Power: 67.0 HP (49.3 kW)

⇄ Compare with another bike All model years ⚠ Recalls listed (1)

What’s new for the 2004 Harley-Davidson FLSTFI Fat Boy

vs the 2003

Spec	2003	2004
Torque	105.0 Nm (10.7 kgf-m or 77.4 ft.lbs)	102.0 Nm (10.4 kgf-m or 75.2 ft.lbs)
Dry weight	320.0 kg (705.5 pounds)	307.0 kg (676.8 pounds)
Wet weight	—	324.0 kg (714.3 pounds)
Seat height	699 mm (27.5 inches)	645 mm (25.4 inches)
Fuel capacity	19.70 litres (5.20 US gallons)	18.90 litres (4.99 US gallons)

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.

Will it fit you?

Worked out in your browser - nothing is sent to us

Your height

Inseam (optional)

Units

At 645mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2004 Harley-Davidson FLSTFI Fat Boy, with a cramped knee angle of around 70 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 750 mm or under — Short Kings →

Find bikes that fit your height →

Full specifications

Engine

Capacity: 1449.0 ccm
Power: 67.0 HP (49.3 kW)
Torque: 102.0 Nm (10.4 kgf-m)
Engine type: V-Twin
Power/weight ratio: 0.2182 HP/kg (dry)
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: 1630 mm
Overall length: 2396 mm
Seat height: 645 mm
Dry weight: 307.0 kg
Wet weight: 324.0 kg
Fuel capacity: 18.90 litres
Ground clearance: 130 mm

Chassis & suspension

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

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 406 mm
Rear brakes: Single disc
Rear brakes diameter: 406 mm
Front tyre: 90/90-16
Rear tyre: 150/80-16

Other

Color options: Vivid black, brilliant silver, sierra red, smokey gold, luxury blue, glacier white pearl, lava red sunglo, two-tone impact blue and vivid black, two-tone luxury teal and brilliant silver, two-tone sierra red and brilliant silver, two-tone smokey gold and

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

Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.

Safety Recalls

⚠ 1 recall may apply

EQUIPMENT:OTHER:LABELSApr 2005 · 05V151000

CERTAIN SOFTAIL MOTORCYCLES FAIL TO COMPLY WITH THE REQUIREMENTS OF PART 567, 'CERTIFICATION.' THE VIN/CERTIFICATION LABEL CONTAINS INCORRECT TIRE SIZE AND INFLATION PRESSURES FOR THE FRONT WHEEL. THE LABEL STATES THE TIRE SIZE IS MT90B21 AND THE INFLATION PRESSURE AS 30 PSI, WHEREAS THE CORRECT TIRE SIZE IS MT90B16, AND THE CORRECT INFLATION PRESSURE IS 36 PSI.

Risk: THE CERTIFICATION LABEL IS INCORRECT GIVING IMPROPER INFORMATION.

Remedy: HARLEY- DAVIDSON WILL MAIL INSTRUCTIONS ALONG WITH CORRECTED FEDERAL CERTIFICATION LABEL. IF AN OWNER SO DESIRES, A DEALER CAN INSTALL THE LABEL FOR THEM. THE RECALL BEGAN ON JUNE 6, 2005. OWNERS MAY CONTACT HARLEY-DAVIDSON AT 1-414-343-4056.

These recalls cover some 2004 bikes of this model. Whether one applies to a specific bike, and whether the repair has already been done, depends on its VIN — check your VIN with NHTSA or ask a dealer.

Source: NHTSA. View all Harley-Davidson recalls →