KTM 790 Duke “The Scalpel”

KTM 790 Duke “The Scalpel”
Manufacturer	KTM
Production	2018
Engine	Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder
Compression ratio	12.7:1
Ignition	Bosch EMS with RBW
Transmission	6 Speed
Frame	Chromium-Molybdenum-Steel frame using the engine as stressed element, powder coated
Suspension	Front: 43mm WP upside-down Rear: WP shock absorber with preload adjuster
Brakes	Front: 2x 300mm discs Rear: Single 240mm disc
Front Tire	Maxxis Supermaxx ST 170/20Z R17
Rear Tire	Maxxis Supermaxx ST 182/20Z R17
Seat Height	825 mm / 32.4 in
Weight	169 kg / 372.5 lbs (dry), 174 kg / 383 lbs (wet)
Fuel Capacity	14 Liters / 3.7 US gal
Manuals	Service Manual

Engine

The engine was a Liquid cooled cooled Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder. The engine featured a 12.7:1 compression ratio.

Drive

Power was moderated via the PASC antihopping clutch, mechanically operated.

Chassis

It came with a Maxxis Supermaxx ST 170/20Z R17 front tire and a Maxxis Supermaxx ST 182/20Z R17 rear tire. Stopping was achieved via 2x 300mm discs in the front and a Single 240mm disc in the rear. The front suspension was a 43mm WP upside-down while the rear was equipped with a WP shock absorber with preload adjuster. The 790 Duke “The Scalpel” was fitted with a 14 Liters / 3.7 US gal fuel tank. The bike weighed just 169 kg / 372.5 lbs.

Photos

Overview

KTM 790 Duke “The Scalpel”

The new KTM 790 Duke, Nicknamed “The Scalpel”, is a smaller, more nimble sibling to “The Beast”, aka the KTM 1290 Super Duke R.

The ‘LC8c’ as it’s known produces 102bhp @ 9,000rpm which is a significant boost over the 73bhp from the single-cylinder belonging to the 690 Duke and the new machine is expected to be far sportier with extreme lean angles on offer.

Familiar WP suspension comes in the shape of 43mm USD forks, a steering damper and an adjustable shock while the cornering ABS with ‘Supermoto’ mode is one we’re looking forward to trying. Four configurable riding modes, launch control plus quickshifter+ for up and down shifts.

An A2 licence option will also be available and the 790 Duke is offered in two colors (black or traditional orange) while 30 accessory parts allow for customisation. Two pre-defined set-ups are on offer, named RACE and STYLE.

Engine & Exhaust

Meet KTM’s first inline twin: the LC8c. That ‘c’ stands for compact, ‘LC8’ for good times ahead.

Chassis

Purity is the focus here. All components have been reduced to the bare essentials. There are no unnecessary parts or covers. The engine, for example, doubles as a load bearing element, the frame is made of extra strong CroMo steel so less material is needed, and components were developed to combine functions wherever possible.

Ergonomics & Comfort

The bike has been made to feel as compact as possible while accommodating a wide range of riders. The goal? Confidence.

Bodywork & Graphics

Purity is one of KTM’s brand values, and in a design context it means not using unnecessary design elements when a simpler option is possible. Or when you can combine multiple functions in one part. Take the tank spoiler, which combines the functions of spoiler and ergonomic surface, for example. Or the taillight that’s been mounted on the license plate holder, so it can be easily removed for a day at the track. This is a bike that looks and feels as compact as possible. You’ll find no round shapes, but straight lines, clarity and the promise of a radically thrilling ride.

Software & Electronics

The KTM 790 DUKE comes with some serious brainpower as standard. Even when you’re flirting with the limit, KTM’s combination of the most advanced software and electronics in the world of motorcycling will have your back. All you have to do is focus on the road ahead – and hold on tight.

Accessories & Luggage

KTM know its customers like to modify and to travel, which is why the PowerParts range boasts a huge variety of accessories and luggage options across its Street range of sportmotorcycles – past and present. All PowerParts are developed alongside their chosen machine, meaning that KTM riders only get parts that perfectly complement their ride and provide that important ‘factory fit’ straight from the dealer.

Key features

2-cylinder, 4-stroke DOHC in-line engine, eight valves actuated via DLC-coated finger followers, electronic fuel injection, two balancer shafts, semi dry-sump lubrication with oil cooler 6 speed transmission and PASC™ slipper clutch Max. output: 77 kW (102 bhp) @ 9,000 rpm, max. torque: 86 Nm at 8,000 rpm Ultra lightweight chrome-molybdenum steel frame with aluminum rear subframe, die-cast aluminum open lattice swingarm 43 mm open-cartridge upside-down fork with split function by WP Suspension High quality WP Suspension gas-assisted shock absorber with progressive spring and preload adjuster 12-stage, adjustable, tapered aluminum handlebar, adjustable levers Highly sensitive WP Suspension steering damper Two 300 mm front brake discs with radial 4-piston calipers and radial front brake master cylinder KTM ride mode technology including customisable “Track” mode Cornering ABS including “Supermoto” mode Lean-angle sensitive motorcycle traction control (MTC) and motor slip regulation (MSR) Quickshifter+ Launch control Multifunctional dashboard with full-color TFT display and illuminated menu switch LED lighting all around OEM Maxxis Supermaxx ST tires as standard Optional KTM MY RIDE

MCN Review

KTM is set to dethrone the naked middleweight class royalty with their new £8499 790 Duke. Yamaha and Triumph should be worried.

For years the Yamaha MT-07 has been the go-to choice for riders looking for a simple, fun, affordable roadster and the MT-09 offered more of the same, with extra chillies and sold in its droves. Triumph’s Street Triple didn’t even need an upgrade last year, but it got it anyway, making the 765cc-powered machine even more dominant.

KTM will upset the applecart when the 790 Duke arrives in dealers next month, because it manages to combine the best bits from all of its rivals. It has the speed and electronic sophistication of the Street Triple R and RS, the joyous punch and simplicity of the (much cheaper) MT-07 and the cheekiness of the MT-09 and MT-09SP…with a dash of crazy 1290 Super Duke R thrown in for good measure.

In many ways the 790 Duke is actually more satisfying than it big bhp super naked brother. It delivers the same wild, slip-sliding mono-wheeling thrills as the 1290 Super Duke R, but its punchy new motor is easier to handle and more involving. It flatters you every inch of the way, instead of looking back at you and saying: ‘is that all you’ve got?’

The 790 Duke is cheaper than the £8999 MT-09SP and a £9100 Street Triple R and pricier than the value-tastic £6349 MT-07, £8199 MT-09 and base-model £8200 Street Triple S, but KTM gives you an awful lot for your money.

Standard equipment includes electronics not even standard on some Japanese superbikes, let alone middleweight nakeds: lean-sensitive ABS, traction and engine braking control, an up/down blipper and four riding modes (Sport, Street, Rain, Track). There’s also a color TFT screen with blue teeth, WP suspension, a steering damper, LED lights, adjustable levers and handlebars and a steering damper. You also get a machine that’s the result of over half a million miles of testing, by 60 orange-shirted engineers and test riders, including former MotoGP legend Jeremy McWilliams. KTM are spoiling us.

In other areas the 790 is built down to a price: WP forks are non-adjustable and you can only twiddle the shock preload. It has own-brand four-piston radial brake calipers (actually made by Spanish experts J.Juan – as seen on Rea and Syke’s WSB leathers) and Maxxis tires.

Don’t let any of that out you off because the 790 Duke is hard to fault and everything works perfectly. There’s a lot more detail in the flesh than pictures, too, from the Testarossa-style air induction strakes buried in the exposed steel subframe, to the ‘inside out’ swingarm detail.

Of course KTM are no strangers to the warm waters of the mid-weight/price/size/power lagoon. Their current single cylinder 690 Duke is a riot of a machine…in small doses, but you need more than one piston to make a truly special road bike and that’s what they’ve done with the new 790 Duke.

A new 799cc LC8c (‘c’ for ‘compact’) motor is the Austrian firm’s first parallel twin. It’s pared to the bone and impossibly small. How such a tiny lump of metal, with bits whizzing around inside, can produce such grunt (64ftlb of torque) and free-revving power (105bhp) is astonishing. Crammed with forged this, lightweight that and DLC-coated the other, the racy, but refined motor looks no bigger than a single.

Unlike a ploddy one-pot, the new engine is as refined and vibe-free as an inline four, but its 75-degree crank offset and 435-degree firing intervals give the twin an added dash of drama. A deep, gurgling V-twin-like growl accompanies you as you whip out of corners and surge through the revs. Off the throttle the KTM gurgles and spits like a race bike. Even with its Euro4 exhaust the 790 Duke makes a wonderful, rhythmic din.

A new tubular steel dual backbone frame is shrink-wrapped around the new engine, so there’s not an ounce of flab. The 790 Duke is as muscular as a pit-bull and weighing just 169kg dry, weighs about as much as its dinner.

With its narrow hips, small riders will find the KTM easy to get on and plant feet down, even with a 825mm high seat (there’s also a 805mm accessory seat and 780mm lowering kit). There’s loads of legroom for six-footers, too. The bar position is natural in its standard position and its bath time-comfy, even after a day’s riding. But as you’d expect from such an unashamed, exposed naked, wind protection is non-existent and your neck feels every mile an hour.

As KTM’s nickname for the 790 Duke suggests, you can go nuts on ‘The Scalpel’. It happily slices through tight twists on the road and will hold its own on a small track, like Brands, Cadwell or Mallory. The chassis is balanced, stable, predictable and the brakes consistently strong. A canted forward riding, feet-back riding has a faint streak of wild supermoto about it.

With little to no means of adjusting the forks and shock the suspension will always be a ‘one size fits all’ compromise. It’s on the firm side of push, but even if there were clickers to play with, the set-up is so bang-on for most road conditions and even the track, you probably won’t bother anyway, unless you were particularly heavy, or extremely fussy.

Cornering ABS lacks a little initial feel, as do most brake-by-wire systems nowadays, but the electronics never intrude unless absolutely needed. The slick autoblipper and quickshifter enhances an already sweet gearbox and you only need to use the light-action slip-assist clutch when you’re pulling away or stopping.

Happily the KTM is less ‘scalpel’ and more ‘butter knife’ when you just want a normal, predictable, motorcycle, for the times you’re just riding to work, or getting caught in the rain. It never strains at its orange leash, or tuts disappointingly when you’re not surgically dissecting pieces of tarmac. The 790 Duke is as calm, reassuring and easy as the best of the middleweight nakeds.

Producing enough power to be fun, but not so much it’s taking you for a ride, a mid-size engine like this is the perfect size for a motorcycle. Think Suzuki GSX-R750, 765cc Street Triple, or any one of Ducati’s ‘baby’ superbikes. Now you can add the 790 Duke to that illustrious list.

Maxxis tires come standard on most of KTM’s off-roaders and the Duke’s Supermaxx STs, which are specially developed for this machine, work well. The Taiwanese (they’re owned by Cheng Shin) offer the kind of performance you’d expect from sports touring rubber and are better in the wet and dry than most Japanese ‘Original Equipment’ tires. Front grip is particularly impressive, as is the speed they warm-up time and how they roll sweetly in and out of corners.

Of course, fitting sportier rubber will always enhance the riding experience, but in any case you don’t really have to worry about rear grip on a bike with such accomplished traction control. It’s set more or less intrusively, depending on the riding mode you’re in and it’s ten-way adjustable (from maximum to ‘off’) in Track mode.

Opening the throttle on some unexpected gravel during our road rider, the TC one hundred per cent stops me from crashing. Who said electronics are rubbish? They’re worth their weight in orange gold KTM maybe late to the multi-cylinder middleweight party, but they’ve made the kind of entrance that’s stopped the music and made everyone gawp in amazement.

KTM's rivals

Triumph lit up an otherwise dull naked middleweight class when it released its Street Triple in 2006. Only Yamaha’s fabulous MT-07 and MT-09 have given riders a reason to look elsewhere since.

KTM is set to change all that with the new 790 Duke. It handles and stops better than both MTs (even the MT-09SP) and is more electronically advanced. The new Street Triple R matches the 790’s rider aids and trumps its suspension. It’s a superb machine and will be the KTM’s closest rival, but lacks the 790’s playfulness. Our up-coming middleweight make shootout promises to one of the tests of the year.

MCN VERDICT - Five stars

KTM have got it so right with its new 790 Duke. Just like the cream of the middleweight naked crop it combines calm practicality with playful excitement. It can be a track tool one day and a commuter the next. Its new LC8c engine is a peach, the chassis predictably balanced and it’s all topped off with superbike-spec electronics. After 24 years of the KTM, why they didn’t think of this before?

Source

Make Model	KTM 790 Duke “The Scalpel”
Year	2018
Engine Type	Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder
Displacement	799 cc / 48.7 cu-in
Bore X Stroke	88 mm x 65.7 mm
Cooling System	Liquid cooled
Compression	12.7:1
Exhaust	Stainless steel primary and secondary silencer
Lubrication	Forced oil lubrication with 2 oil pumps
Induction	Dell’Orto fuel-Injection
Ignition	Bosch EMS with RBW
Starting	Electric
Max Power	78 kW / 105 hp @ 9000 rpm
Max Torque	87 Nm / 63.4 lb-ft @ 8,000 rpm
Clutch	PASC antihopping clutch, mechanically operated
Transmission	6 Speed
Final Drive	Chain 520 X-Ring
Primary Drive	39:75
Secondary Gear Ratio	16:41
Frame	Chromium-Molybdenum-Steel frame using the engine as stressed element, powder coated
Front Suspension	43mm WP upside-down
Front Wheel Travel	140 mm / 5.5 in
Rear Suspension	WP shock absorber with preload adjuster
Rear Wheel Travel	150 mm / 5.9 in
Front Brakes	2x 300mm discs
Rear Brakes	Single 240mm disc
Abs	Bosch 9MP two-channel ABS (incl. Supermoto mode, diesengageable)
Front Wheel	3.50 x 17 in cast aluminum
Rear Wheel	5.50 x 17 in cast aluminum
Front Tire	Maxxis Supermaxx ST 170/20Z R17
Rear Tire	Maxxis Supermaxx ST 182/20Z R17
Rake	24°
Trail	98 mm / 3.8 in
Steering Head Angle	66°
Handlebar	Aluminum, tapered, Ø 28/22 mm
Dimensions	Length 2062 mm / 81.2 in Width 904 mm / 35.6 in Height 1059 mm / 41.7 in
Wheel Base	1475 ± 15 mm / 58 in
Seat Height	825 mm / 32.4 in
Ground Clearance	186 mm / 7.3 in
Dry Weight	169 kg / 372.5 lbs
Wet Weight	174 kg / 383 lbs
Fuel Capacity	14 Liters / 3.7 US gal

Videos

Click to load content

Click to load content

External Links

• https://www.motorcyclenews.com/