Harley-Davidson Softail Slim S (FLSS) — Cruiser
NastyNils / Harley-Davidson Press

2016–2017 · Cruiser · Buyer's Guide

Softail Slim S (FLSS)

Blacked-Out Chopper With Grunt

The Machine's Character

The Softail Slim S takes the Screamin' Eagle Twin Cam 110B, Harley's big 1801 cc air-cooled 45° V-twin, and drops it into a stripped, blacked-out, military-flavored bobber. You get 91 hp and a thick 109 lb-ft of torque, most of it arriving low and early, wrapped in metal rather than plastic. This is a factory custom that commits fully to the look: long, low, minimal, with a matte war-era attitude. In a class where stance and presence outrank horsepower, it plants its flag on style first and backs it with a genuinely muscular motor.

On the road it hides its 712 lb well, sitting low on a 25.6 in seat that lets most riders flat-foot at a stop and gives an easy, planted feel once rolling. It ages the way good Harleys do, as a platform you keep making your own, since the aftermarket runway here is enormous. Two honest cautions before you sign. Early bikes carry clutch recalls that can leave the clutch hard to disengage, and it builds real heat on your legs when you sit idling in traffic. Sort those, and it suits the rider who wants character worn openly.

Hard Numbers

Spec sheets don't ride bikes, but they set the baseline.

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Key specifications
Power 91 hp (68 kW)
Torque 109 lb-ft (148 Nm)
Displacement 1801 cc
Engine 45° V-twin
Cooling Air-cooled
Gearbox 6-speed
Final drive Belt
Front tire MT90B16
Rear tire MU85B16
Seat height 25.6 in (650 mm)
Wet weight 712 lb (323 kg)
Fuel capacity 5.0 gal (18.9 L)

Equipment check

Chassis

  • Cruise Control Standard

Safety

  • ABS Standard

The Voice of Experience

Portrait of NastyNils

The test ride

Thumb the starter and the big twin settles into that uneven, chest-thumping idle you feel through the pegs and the seat before you really hear it. Pull away and the vibration organizes itself into a steady pulse that stays on the right side of pleasant, alive without buzzing your hands numb. The riding position is pure Softail: feet forward, back relaxed, wrists light, the kind of stance that unspools tension on a long straight road. The belt runs quiet and clean under the exhaust note. At walking pace you feel every one of those pounds through the bars, so tight lots and slow parking ask for a plan. Get it above a roll and the mass seems to evaporate, the bike tracks straight and steady, and the whole thing feels carved from one piece of iron.

A long, straight paved road stretches toward the horizon through agricultural fields in Vermont. Power lines and a mailbox are visible along the roadside. Lush green vegetation, cumulus clouds, good daylight conditions. The landscape is flat to gently rolling. Asphalt pavement appears to be in good condition. Rural American setting.
Meric Tuna / Pexels

The Truth on the Street

Years of listening shaped what follows: talk at track weekends, questions owners raise in person, and the notes riders send to my inbox. For this bike the split is clean: the look and the motor win people over, while the seat and lean angle wear on them.

The Look And Motor Win Them

Riders bring up the all-black finish more than anything else. Engine, wheels, fork and exhaust in black give it an aggressive custom-bobber look with nothing added. The motor gets the next-loudest vote: owners talk about heavy low-end pull that moves the weight without drama, and many note the counterbalancers keep it smooth while leaving the Harley feel intact. A fair number add it turns and holds a line better than something this heavy should.

Where It Wears On You

The gripes cluster as tightly. The floorboards scrape early, and riders say they run out of lean sooner than they'd like. The solo seat draws steady criticism for going numb and sore after an hour or so, and plenty swap it out. A few mention heat building on their legs in slow traffic, a harsh rear end over big bumps, and a sense it shares too much with other Softails to stand on its own.

Known issues

  • Clutch master cylinder may fail to disengage the clutch (NHTSA 16V471000)

    drivetrainRecall

    On certain 2016 units the clutch master cylinder may lose the ability to generate enough lift to disengage the clutch, especially after the motorcycle has been parked for an extended period. Dealers inspect the master cylinder for gas in the fluid and, if present, flush the clutch system and rebuild the master cylinder. Harley-Davidson recall 0169.

  • Secondary clutch actuator may leak, impairing clutch disengagement (NHTSA 18V734000)

    drivetrainRecall

    On certain 2017 units the secondary clutch actuator cylinder may leak fluid internally and the clutch master cylinder may lose the ability to disengage the clutch. Dealers install a new secondary clutch actuator piston assembly. Harley-Davidson recall 0173.

  • Overheating when idling

    coolingoccasional

    Some owners report significant heat build-up during prolonged idle or slow traffic, with heat radiating onto the rider's legs. No official fix documented.

The Expert Benchmark

Where this Harley-Davidson Softail Slim S pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.

What kind of bike this is — character vs. the class

This bike Class average

The shape of the Harley-Davidson Softail Slim S — numbers and character vs. the average Cruiser

Head-to-head: Harley-Davidson Softail Slim S vs. its rivals

The 'Should I Buy It?' Score

Forget spec-sheet bragging. Here's who the Softail Slim S is actually built for.

Aerial view of a winding asphalt road cutting through volcanic terrain on La Gomera, Canary Islands. The road curves through sparse green vegetation with rocky volcanic peaks visible in the background and a settled valley to the left. Clear lane markings, dry climate, partly cloudy sky.

Best cruiser for Sturgis?

This is exactly your bike. The sound, the blacked-out presence, and the rally-ready identity give you the statement you ride for, and the aftermarket lets you sign it your way.

Made for A1A — Florida Atlantic Coast · Black Hills / Sturgis Rally Hub · Daytona Main Street / Bike Week

Best retro motorcycle for road trips?

The stripped, classic look suits slow historic routes and easy days beautifully. Just know the small tank and the idle heat will nag you on stop-and-go main streets.

Made for Acadia National Park · Austin / Handbuilt Motorcycle Show · Blue Ridge Parkway

Best touring motorcycle for long distance?

Honestly, this one is a stretch for you. It has the stability for open miles, but no wind protection, a small tank, and idle heat make loaded two-up touring hard work.

Made for Beartooth Highway · Blue Ridge Parkway · Going-to-the-Sun Road

Alternatives to the Harley-Davidson Softail Slim S

If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.

Any price note compares both bikes at the same age — the youngest age both have on the used market — against this Harley-Davidson Softail Slim S. “cheaper/pricier” is what that bike costs second-hand, not how worn it is.