Harley Davidson FLSTFBS Softail Fat Boy S 2017 Service Manual

Ultimate Motorcycling's own review sums up this bike's entire concept in one line: "take the Fat Boy to the gym to beef him up and you get the 2017 Harley-Davidson Fat Boy S. Powered by the High Output Twin Cam 110B motor, the Fat Boy S is ready to ripple urban pavement." TopSpeed's own confirmed account notes the significance of that engine choice directly: "the 110B drives the Fat Boy S well into power-cruiser territory... making it the largest and most powerful production H-D motor to date," a unit previously reserved exclusively for Harley's CVO department.

Power comes from the Screamin' Eagle Twin Cam 110B, a 1,802cc (110 cu.in) air-cooled V-twin, a 4-inch bore and 4.37-inch stroke, a 9.5:1 compression ratio, delivering a claimed 108 lb-ft of torque at 4,000 rpm, fed by Electronic Sequential Port Fuel Injection through the same 6-speed transmission and chain primary drive ratios as the standard Fat Boy. TopSpeed's own confirmed account notes a genuinely distinctive intake: rather than the standard bike's round air cleaner, the 110B breathes through an oval, low-resistance Screamin' Eagle filter with an exposed element, plus a removable rain sock.

Autoevolution's own confirmed styling account describes exactly what "takes dark to a new level": gloss black lower forks, axle nut covers, handlebar and riser, a black brake lever and hydraulic clutch assembly, and a black over/under shotgun exhaust with slash-cut mufflers — Ultimate Motorcycling's own review confirms the whole bike ships in just two shades of black, with chrome deliberately banished. Total Motorcycle's own confirmed spec sheet lists black bullet-hole disc cast aluminum wheels at both ends, a 4-piston front and 2-piston rear brake caliper setup, and standard cruise control and ABS.

Ultimate Motorcycling's own review flags one genuine trade-off worth knowing: the Fat Boy S runs less cornering clearance than the standard Fat Boy, so it's built for straight-line muscle rather than canyon carving. This 2017 model year closed out the FLSTFBS code before Harley's 2018 Softail redesign carried the 110ci engine forward as the FLFBS Fat Boy 114 (with displacement further increased to 1,868cc/114ci) on the new single-shock chassis.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 2017 Softail Fat Boy S FLSTFBS running the way it was built to.