Harley Davidson FLSTF Softail Fat Boy 2010 Service Manual

Harley calls the Fat Boy the original icon of fat custom styling, rolling with stature second to none. For 2010 it gets a new fuel tank sender for accurate fuel-level readings and a new helical-cut fifth gear for improved transmission sound. The Softail rear suspension hides the shocks under the chassis to mimic the lines of a vintage hardtail frame, and the rigid-mounted powertrain gives a solid connection between the rider and the engine.

Power comes from the rigid-mounted, counter-balanced Twin Cam 96B, an air-cooled 1,584cc V-twin with pushrod-operated overhead valves and hydraulic self-adjusting lifters. It has a 3.75 x 4.38 inch bore and stroke and a 9.2:1 compression ratio, fed by Electronic Sequential Port Fuel Injection. Claimed torque is about 125 Nm (92 lb-ft) at 3,000-3,500 rpm. The gearbox is a 6-speed Cruise Drive with a 9-plate wet clutch and belt final drive. The powertrain is black powder-coated with chrome covers, and the exhaust is a chrome over/under shotgun.

The styling is classic Fat Boy. It has silver bullet-hole disc cast aluminum wheels, a 200mm rear tire, a chrome front fork nacelle, a chrome nostalgic seven-inch ball headlamp and a chrome oil tank. There is a chrome tank console with electronic speedometer, a chrome bullet-studded seat valance and tank strap, a 1.25-inch internally wired handlebar on Bare Knuckle risers, full-size rider footboards and a two-piece two-up seat with removable pillion.

Dennis Kirk lists a 41mm fork, a 140/75VR-17 front tire, a 200/55VR-17 rear, a 133-tooth 20mm drive belt on 32/66 pulleys, an RA8HC spark plug, an H30292 oil filter and a YTX20HL-BS battery. Brakes are a single 292mm disc at each wheel, with a four-piston front caliper and a two-piston rear.

Confirmed figures list a 94.3-inch (2,396mm) length, a 64.4-64.5-inch wheelbase, a 31-degree rake with 5.8 inches of trail and a 25.4-inch seat height. The tank holds 5 gallons. Dry weight is about 690-694 lbs. Fuel economy is 35 mpg city and 54 mpg highway, and the US price was $15,999.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 2010 Softail Fat Boy FLSTF running the way it was built to.