2012 Harley-Davidson FLSTFB Fat Boy Special Technical Analysis & Specification Breakdown
Positioned in Harley-Davidson's custom - cruiser motorcycle lineup, the 2012 Harley-Davidson FLSTFB Fat Boy Special pairs a 1690 cc (103.1 cu in) air-cooled v2, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 98.4 x 111.1 mm (3.9 x 4.4 inches) with a 9.6:1 compression ratio.
On the scales, the FLSTFB Fat Boy Special measures 330 kg (728 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 1,630 mm (64.2 in) wheelbase engineered for planted straight-line stability. The 18.9-liter (5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Harley-Davidson archive, this model family spans 2 indexed model years from 2011 to 2012, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Engine
Displacement1690.0 ccm (103.12 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsTwin Cam 103B™
Compression9.6:1
Bore x Stroke98.4 x 111.1 mm (3.9 x 4.4 inches)
Fuel SystemInjection. Electronic Sequential Port Fuel Injection (ESPFI)
CoolingAir
Transmission
Gearbox6-speed
Final DriveBelt (final drive)
ClutchMulti-plate with diaphragm spring in oil bath
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
