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2005–2006 · Cruiser · Buyer's Guide
Softail Fat Boy FLSTF (MY2005)
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The Machine's Character
The Fat Boy is the most literal reading of Harley's long-and-low Softail idea, built around a 1449 cc air-cooled 45° V-twin that makes 66 hp and a fat 86 lb-ft of torque through a 5-speed box and a belt final drive. What sets this generation apart is how it wears that hardware. Solid cast aluminum disc wheels, a wide front fork, floorboards, and a slammed stance give it a silhouette you read in a single glance. The rear suspension hides itself under the frame so the profile stays visually hardtail. Nothing about it apologizes for being heavy metal.
On the road it wants a big, unhurried rhythm. The torque arrives low and pulls you along without any need to work the gearbox, and at highway speed the long 64.5 in wheelbase holds a planted, confident line. The low 27.1 in seat makes the 714 lb wet weight feel friendlier at a stop than the number suggests, though you still feel every pound when you paddle it around a parking lot. It fits a rider who wants presence and character over agility. The honest caveat: these early Twin Cam engines need an owner who watches maintenance closely, especially the cam chain tensioners.
Hard Numbers
Spec sheets don't ride bikes, but they set the baseline.
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| Power | 66 hp (49 kW) |
|---|---|
| Torque | 86 lb-ft (117 Nm) |
| Displacement | 1449 cc |
| Engine | 45° V-twinMotorcycles With V-Twin Engines → |
| Cooling | Air-cooled |
| Gearbox | 5-speed |
| Final drive | BeltMotorcycles With Belt Drive → |
| Fork | Telescopic |
| Front brake | 292 mm |
| Front tire | MT90B16 |
| Rear tire | 150/80-16 |
| Wheelbase | 64.5 in (1638 mm) |
| Seat height | 27.1 in (688 mm)Motorcycles With a Seat Height Under 30 Inches → |
| Wet weight | 714 lb (324 kg) |
| Fuel capacity | 5.0 gal (18.9 L) |
| Fuel economy | 43 mpg (US) |
Equipment check
Chassis
- Manually Adjustable Rear Suspension Standard
Known issues
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Cam Chain Tensioner Shoe Failure
The plastic shoes on the cam chain tensioners can become brittle over time and disintegrate, sending debris throughout the engine. This is a well-documented issue across Twin Cam 88 and early 96 engines.
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Valve Stem Seal Leakage
Early models may experience oil consumption and blue smoke from worn valve stem seals, particularly on the 2005 Twin Cam 88.
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Starter Clutch Wear
Some owners report starter clutch wear, leading to grinding noises or intermittent starting issues, especially on high-mileage examples.
The Numbers Compared
Compare the technical specifications of the Harley-Davidson Softail Fat Boy FLSTF with other bikes in its class.
Head-to-head: Harley-Davidson Softail Fat Boy FLSTF vs. its rivals
Power
Torque
Displacement
Wet weight
Seat height
Alternatives to the Harley-Davidson Softail Fat Boy FLSTF
If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
Successor · 2007–2009
Harley-Davidson Softail Fat Boy FLSTF (FLSTF-MY2008)
Solid Discs, Zero Apologies
Competitor · 2006–2009
Triumph Rocket III Classic (MY2006)
Two Thousand CC Of Torque
Competitor · 2004–2008
Triumph Rocket III (MY2004)
Two Thousand CC's Of Intent
Same Platform · 2005–2006
Harley-Davidson Softail Standard FXST (FXST-MY2005)
Twin Cam Torque, Zero Fuss
Similar Character · 2002–2009
Honda VTX 1800 (MY2005)
120 Pound-Feet Of Presence
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