Harley Davidson FLSL Softail Slim 2021 Service Manual

Unlike its 114-badged Softail siblings, the Slim runs the smaller Milwaukee-Eight 107 — and that's by design. This is Harley's take on a post-WWII stripped-down bobber, built around clean, minimal lines rather than outright muscle, with a classic tuck-and-roll solo saddle, Hollywood handlebars, floorboards, and gloss black steel-laced wheels wrapped in a 130mm front tire.

The Milwaukee-Eight 107 makes a claimed 92.5 hp and 110 ft-lb of torque, running a 10.0:1 compression ratio through electronic sequential port fuel injection and a 2-into-2 shotgun exhaust. Bore and stroke measure 3.937 in. and 4.374 in., paired with a 6-speed gearbox. Up front, a racing-style cartridge fork keeps the reduced weight and linear damping the Slim's low-key styling suggests, while an adjustable mono-shock rear preserves the hardtail look.

Dimensions run 90.9 in. long with a 25.5 in. laden seat height and 4.7 in. of ground clearance — low and easy to manage at a stop, in keeping with the bobber brief. It carries a 5-gallon tank, 5-quart oil capacity, and ships at 642 lbs. Standard equipment includes ABS and a factory security system, with 2021 pricing starting at $15,999 for Vivid Black, and colors extending to Billiard Red, River Rock Gray/Black Denim, and Midnight Crimson/Stone Washed White Pearl.

Stripped-down doesn't mean low-maintenance — this factory manual covers the torque specs, wiring diagrams, and procedures to keep a Softail Slim's minimalist setup running right.