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2010–2011 · Naked Bike · Buyer's Guide
The Back-Road Single That Bites
This is the sharpened version of KTM's big single, and the sharpening is real rather than cosmetic. The 690 cc LC4 makes 71 hp at 7,500 rpm and 51 lb-ft at 6,550 rpm, and the way it delivers that is what separates the R from an ordinary single: it pulls harder at every point in the rev range, not only once you've wound it out. The chassis is built for one thing. Aggressive geometry, a stiff frame, a 320 mm front disc, and a revised fork that runs a stiffer tune and a new coating on the legs. Put together, it's a back-road scalpel with a plate on it.
On the road that character shows up as directness. It arrives at the corner, changes direction once, and gets back on the gas, and it does that all day without wearing you down. Long mountain rides are where it lives. It's for a rider who wants to feel the machine working under them and doesn't need the bike to be polite about it. The honest caveat is mechanical. The rocker arm bearings on this engine can fail early, sometimes by 3,100 mi (5,000 km), with loud engine noise and camshaft damage in the worst cases, so inspection intervals matter. The fuel filter and pump can also clog or quit, which shows up as hesitation or stalling, especially after the bike has sat. There are no ride modes here.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 71 hp (52 kW) @ 7,500 rpm |
|---|---|
| Torque | 51 lb-ft (70 Nm) @ 6,550 rpm |
| Displacement | 690 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Front brake | 320 mm |
| Front tire | 120/70 ZR 17 |
| Rear tire | 160/60 ZR 17 |
| Seat height | 34.1 in (865 mm) |
| Fuel capacity | 3.6 gal (13.5 L) |
| Top speed | 112 mph (180 km/h) |
| Fuel economy | 43 mpg (US) |
First thing your body registers is the seat height. At 34.1 in (865 mm) you're perched high and looking down at traffic, and the wide bar puts your hands out where you can lever the front end around with almost nothing. The single thumps rather than buzzes. I expected the longer stroke to send tingle through the bar and pegs and it never showed up; the grips stay flat, your feet stay flat, and after four hours of mountain roads your hands aren't numb. Wind pressure does its usual honest work on a naked bike, making 60 mph feel like an event and keeping you off the numbers that lose licenses. The one thing you learn fast is your own width. That bar is broad, and in city gaps you plan for it. The reward is that the bike goes exactly where your wrists point it, every time, without any argument.
My own 0–100 score for this bike against the class, area by area — the marker on each bar is the class average.
This is the part of the bike I keep coming back to. You point it and it's already there, with no lag between the decision and the machine acting on it, and that holds true for corrections you make once you're already leaned over and committed. The rhythm it asks for is short and aggressive: one quick flick, a beat at the apex, then upright and driving. It doesn't reward long, patient arcs at full lean, so ride it as a string of decisive moves and the chassis works with you. The revised fork earns its place too. Stiffer tune, new coating on the legs, and the result is that more of what the front tire is doing reaches your hands than the standard unit ever managed. Cold asphalt or the ragged edge of grip, you get the signal early enough to act on it, and that shows up as real traction and confidence rather than just a nicer feel through the bars.
Get greedy with the throttle on a corner exit and the front end lifts on its own. In the low gears I'd be carrying the wheel for the better half of the straight before the next corner showed up and reset the whole game. That's the loop this bike keeps offering you, and it's a big part of why it's worth riding hard.
I leaned on the brakes hard through a full set of mountain serpentines and the bike simply took it, corner after corner, without ever getting unsettled by how late I left things. The anti-hopper clutch is the other half of the story. It's sorted well enough that a rider with no supermoto background can get the rear stepping out under a hard downshift, and the satisfaction when it lands cleanly is hard to overstate. Watching someone ahead of you pull it off is nearly as good.
The big single is the surprise here, because I expected the longer stroke to punish me and it never did. Bar and footpeg feel stayed flat, and throttle response came through unchanged. What impressed me more is how civil it stays when you're not attacking. Choppy inputs, stop-and-go, threading tight gaps in traffic, and it never bites back the way lesser singles do. Composed where it needs to be, hard-pulling when you ask.
The wide bar is the trade you make. In tight urban gaps you plan around your own width, and there's no getting away from that. What you get back is course changes that happen instantly and cost you nothing, plus an engine strong enough to keep city riding interesting without ever turning snappy on you. Point it at a long mountain day instead and it's completely at home. It won't wear you out on the way there, and it won't run short of character once you arrive.
None of this comes from my own seat time. It's what I've collected over the years from riders themselves: threads, paddock talk, owner conversations, and the notes that land in my inbox. Line it all up for the 690 Duke R and the split is clean. The chassis talk is glowing, and the day-to-day talk is where the grumbling starts.
The strongest and most repeated theme is how the bike steers. Owners describe razor-sharp precision, a front end that stays planted when pushed, and instant direction changes with real corner speed on the exit. They tie a lot of that to how little mass there is to move, calling it flickable and easy to wrestle through tight corners and city obstacles. The engine draws its own praise: strong midrange, a gritty character, addictive delivery, and nobody claiming it's smooth. The gripes sit on the other side of that coin. The firm suspension that riders love on a good road goes harsh over broken pavement and wears them down in town. Vibration through the bars and pegs at highway speed leaves hands numb on longer runs. A few also flag the price the R asked for a single.
Rocker arm bearing failure
The rocker arm bearings can fail prematurely, sometimes as early as 5,000 km, causing loud engine noise and, in severe cases, damage to the camshaft. Regular inspection and replacement of the rocker arms are recommended at every major service.
Fuel system problems
Clogging of the fuel filter or failure of the fuel pump can occur, leading to poor running, hesitation, or stalling. The issue is often exacerbated by contaminated fuel or extended periods without use.
Where this KTM 690 Duke R pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Top speed
Seat height
Forget spec-sheet bragging. Here's who the 690 Duke R is actually built for.
If your weekends run from LA traffic straight into the canyons, this fits. It changes direction once, drives out hard, and the front lifts on exit in the low gears whether you asked for it or not.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
Tight, repeating Appalachian corners are exactly the rhythm this bike wants: brake late, flick it once, back on the gas. It rewards precision far more than horsepower.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
It handles city traffic and the ridge roads on the same tank, and 43 mpg helps. Go in knowing this is a raw single with a real maintenance schedule, not an easy appliance.
Made for Bay Area Ridge Roads · San Francisco / Bay Area · Skyline Boulevard / Alice's Restaurant
If you're cross-shopping the older generation, here's what changed.
Previous generation · 2008–2011
One Cylinder, Zero Filler
Compare to the previous model →If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
