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Harley-Davidson Softail Fat Boy FLSTF (MY2005) — Cruiser
NastyNils / Harley-Davidson Press

2005–2006 · Cruiser · Buyer's Guide

Softail Fat Boy FLSTF (MY2005)

All Cast Wheels, All Icon

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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Key specifications
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
A long, straight paved road stretches toward the horizon through agricultural fields in Vermont. Power lines and a mailbox are visible along the roadside. Lush green vegetation, cumulus clouds, good daylight conditions. The landscape is flat to gently rolling. Asphalt pavement appears to be in good condition. Rural American setting.
Meric Tuna / Pexels

Known issues

  • Cam Chain Tensioner Shoe Failure

    engine common

    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.

  • Valve Stem Seal Leakage

    engine occasional

    Early models may experience oil consumption and blue smoke from worn valve stem seals, particularly on the 2005 Twin Cam 88.

  • Starter Clutch Wear

    engine occasional

    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

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