2016–2019 · Naked Bike · Buyer's Guide
Single Cylinder Scalpel On Street
The 690 Duke runs one job hard: a single liquid-cooled cylinder, 690cc making 73 hp and 55 lb-ft, hung in a light steel trellis frame with a WP upside-down fork and a single 320mm Brembo up front. KTM's ride-by-wire throttle meters the LC4, standard ABS backs it up, and Motorcycle Traction Control sits on the options sheet if you want it. This is the concentrated end of the middleweight naked class. No fairing, no spare mass, everything pointed at feel and directness. It looks the part too, sharp and modern where the class often plays it safe.
It rides the way it looks. Light on its feet, quick to turn, and generous with lean angle, the Duke wants a rider who steers with intent and enjoys a machine that talks back through the bars. Around town it threads traffic; on a good road it rewards commitment. The caveats are honest ones. The 32.9 in (835 mm) seat is tall, so shorter riders sit on their toes, and a hard-working single carries buzz you learn to live with. Check the history too: 2016–2017 bikes had a fuel filler-cap recall, 2018–2019 a clutch slave cylinder recall, plus watch for rocker arm and fuel pump trouble.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 73 hp (54 kW) |
|---|---|
| Torque | 55 lb-ft (74 Nm) |
| Displacement | 690 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Fork | Upside-down (USD) |
| Front brake | 320 mm |
| Front tire | 120/70-17 |
| Rear tire | 160/60-17 |
| Wheelbase | 57.7 in (1466 mm) |
| Seat height | 32.9 in (835 mm) |
| Fuel capacity | 3.7 gal (14 L) |
Equipment check
Drivetrain
Safety
Swing a leg over and the first thing you notice is how narrow and upright it is. The bars sit wide and close, the pegs give you room, and you look down over that big single doing its thing. Fire it up and it thumps, a proper mechanical bark that settles into a busy idle. Get rolling and the single sends a steady tingle through the pegs and grips that climbs with revs. It's part of the character, not a fault, though your hands feel it on a longer stretch. At walking pace in a parking lot the bike feels almost weightless under you, easy to paddle and flick around. Wind hits your chest early since there's nothing out front, which keeps road speeds feeling honest and alive without pushing your luck.
Clutch slave cylinder failure (recall)
On 2018-2019 models, the bellow-style clutch slave cylinder gasket can become damaged, leading to clutch inoperability and difficulty shifting. A recall (NHTSA 21V-792) was issued for replacement.
Fuel tank leak at filler cap (recall)
On 2016-2017 models, fuel can leak from the filler cap area of the fuel tank, posing a fire risk. KTM issued a recall (NHTSA 17V-388) to address the affected filler-cap area.
Premature rocker arm bearing wear
Some owners report rocker arm bearing failure, leading to noisy top-end and potential engine damage. More frequent in earlier production; the 2016 update reportedly improved durability.
Fuel pump failures
Several owners have experienced fuel pump issues causing stalling or no-start conditions. The pump may need replacement.
Where this KTM 690 Duke pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Seat height
Forget spec-sheet bragging. Here's who the 690 Duke is actually built for.
Perfect for Skyline runs and coffee stops. It's photogenic, sharp-handling, and easy in city traffic, exactly the kind of bike that stands out at Alice's without trying too hard.
Made for Bay Area Ridge Roads · San Francisco / Bay Area · Skyline Boulevard / Alice's Restaurant
Built for Angeles Crest. Light, precise, and rich with lean angle, it rewards a skilled rider who lives for tight, technical corners over straight-line speed.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
Made for the Dragon and the Blue Ridge. Its feedback and flickability let you focus on clean lines and corner technique, which counts for more than horsepower on those roads.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
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 KTM 690 Duke. “cheaper/pricier” is what that bike costs second-hand, not how worn it is.
Successor · 2018
The Scalpel Hits Its Mark
Competitor · 2014–2017
Raw Twin, Weightless Handling
Competitor · 2018–2020
The Purist Café Thumper
Same Platform · 2018–2020
One Cylinder, All Corners