| MODEL | HARLEY-DAVIDSON SOFTAIL FAT BOY LO FLSTFB 2012 |
| Year | 2012 |
| Engine Type | Four stroke, V-twin, Twin Cam 103B, counter-balanced, pushrod-operated OHV, hydraulic self-adjusting lifters, 2 valves per cylinder |
| Displacement / Capacity | 1690 cc / 103.1 cu in |
| Bore X Stroke | 98.4 x 111.1 mm / 3.875 x 4.375 in |
| Compression Ratio | 9.6:1 |
| Cooling System | Air cooled |
| Max Power | — |
| Max Torque | 134 Nm / 98.7 lb-ft @ 3000 rpm |
| Ignition | Single-fire, non-wasted, map-controlled spark ignition |
| Induction | Electronic Sequential Port Fuel Injection (ESPFI) |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Pressurized, dry-sump |
| Gear Box | 6 Speed Cruise Drive |
| Clutch | Multi-plate, wet |
| Final Drive | Belt |
| CHASSIS SPECS | |
| Frame | Mild steel tubular frame, rectangular-section backbone, stamped, cast and forged junctions, forged fender supports, MIG welded |
| Front Suspension | 41.3 mm telescopic fork, lowered 1.15 in, 130 mm / 5.1 in travel |
| Rear Suspension | Hidden, horizontal-mounted coil-over shocks, lowered 1.15 in, 91 mm / 3.6 in travel |
| Front Brakes | Single 292 mm disc, 4-piston caliper |
| Rear Brakes | Single 292 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2395 mm / 94.3 in |
| Overall Width | 990 mm / 39.0 in |
| Overall Height | 1095 mm / 43.1 in |
| Seat Height | 616 mm / 24.3 in (laden), 670 mm / 26.4 in (unladen) |
| Wheelbase | 1638 mm / 64.5 in |
| Ground Clearance | 122 mm / 4.8 in |
| Dry Weight | 318 kg / 700 lbs |
| Wet Weight | 332 kg / 731 lbs |
| WHEEL SPECS | |
| Front Tyre | 140/75R17 67V |
| Rear Tyre | 200/55R17 78V |
| FUEL SYSTEM | |
| Fuel Capacity | 18.9 Litres / 5.0 US gal |
| Fuel Consumption | 5.6 L/100 km / 42 US mpg |
| Top Speed | — |
For 2012 the Fat Boy Lo moved to the 103 cu in Twin Cam engine shared with the rest of the Softail range, giving more low-down torque. ABS and the Smart Security System became available as an option pack, and the Engine Idle Temperature Management system (which can shut off the rear cylinder at idle) was added. The lowered suspension, narrow seat and blacked-out styling carried over.
