2012 Harley-Davidson Softail Fat Boy

Engine and transmission

Displacement1688.0 ccm (103.00 cubic inches)

Engine typeV2, four-stroke

Engine detailsAir-cooled, Twin Cam 103B

Torque133.8 Nm (13.6 kgf-m or 98.7 ft.lbs) @ 3000 RPM

Compression9.6:1

Bore x stroke98.4 x 111.3 mm (3.9 x 4.4 inches)

Valves per cylinder2

Fuel systemInjection. Electronic Sequential Port Fuel Injection (ESPFI)

Lubrication systemPressurized, dry-sump

Cooling systemAir

Gearbox6-speed

Transmission typeBelt (final drive)

ClutchMulti-plate with diaphragm spring in oil bath

DrivelinePrimary Drive Chain, 34/46 ratio. Final Drive Belt, 32/66 ratio.

Fuel consumption5.60 litres/100 km (17.9 km/l or 42.00 mpg)

Greenhouse gases129.9 CO2 g/km. (CO2 - Carbon dioxide emission)

Exhaust systemChrome, over/under shotgun exhaust with dual mufflers

Chassis, suspension, brakes and wheels

Frame typeMild steel tubular frame; rectangular section backbone; stamped, cast, and forged junctions; forged fender supports; MIG welded

Rake (fork angle)31.0

Trail147 mm (5.8 inches)

Front suspension41.3 mm telescopic, beer can covers

Front wheel travel130 mm (5.1 inches)

Rear suspensionHidden, horizontal-mounted, coil-over

Rear wheel travel109 mm (4.3 inches)

Front tire140/75-R17

Rear tire200/55-R17

Front brakesSingle disc. 4-piston caliper. Optional ABS.

Diameter292 mm (11.5 inches)

Rear brakesSingle disc. 2-piston caliper. Optional ABS.

Diameter292 mm (11.5 inches)

WheelsSilver, Bullet Hole Disc Cast Aluminum

SeatTwo-piece, two-up Softail seat with removable pillion