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2017 KTM 390 Duke Overview
The 2017 KTM 390 Duke is a sport motorcycle built around 373 cc of displacement. Under the tank sits a Four stroke, single cylinder. DOHC with finger followers, 4 valves engine, a compression ratio of 12.6:1. 2017 KTM 390 Duke delivers 43.5 hp @ 9500 rpm of peak power and 3.6 kg-m of torque. From a practical standpoint, the 2017 390 Duke tips the scales at 149 kg, carries a 13.4 L fuel tank, offers a seat height of 830 mm and spans a 1357 mm wheelbase. That's roughly 53.7 kg lighter than the average sport motorcycle in our database. Scroll down for the complete 2017 KTM 390 Duke spec sheet covering every technical detail from suspension travel to tyre sizes.
2017 390 Duke - Pros & Cons
Strengths
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Strong power output: 2017 KTM 390 Duke makes 43.5 hp @ 9500 rpm with 3.6 kg-m of torque - competitive figures for its class.
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🔧
Fuel injection: The Bosch Injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Considerations
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Tall seat height: The 830 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
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Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.
Wear Points & Servicing Notes
Cooling system servicing
The Liquid Cooled system on the 390 Duke needs a coolant change roughly every two years (or per the service schedule) - skipping it lets the coolant turn acidic and corrode the aluminium water passages over time.
Fuelling & injector care
Fuelling comes from Bosch Injection. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.
Brake disc and pad wear
The Single 320 mm disc, 4 piston radial caliper front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the 390 Duke runs WP inverted fork ø 43 mm and WP monoshock at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.
Frame & chassis check
The frame is Steel trellis frame, powder coated - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
390 Duke - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2017 KTM 390 Duke, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained 390 Duke should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task on any 390 Duke. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The 390 Duke's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
2017 KTM 390 Duke - Frequently Asked Questions
What engine does the 2017 KTM 390 Duke have?
The 2017 KTM 390 Duke uses a Four stroke, single cylinder. DOHC with finger followers, 4 valves engine with 373 cc of displacement. It is liquid cooled.
How much does the 2017 KTM 390 Duke weigh?
The 2017 KTM 390 Duke weighs 149 kg. This is the manufacturer's dry figure.
How much power does the 2017 KTM 390 Duke make?
The 2017 KTM 390 Duke produces 43.5 hp @ 9500 rpm of power and 3.6 kg-m of torque. These are peak figures.
What is the fuel tank capacity of the 2017 KTM 390 Duke?
The 2017 KTM 390 Duke has a 13.4 L fuel tank. At around 5-6 litres per 100 km, that is roughly 223-268 km between stops.
Is the 2017 KTM 390 Duke suitable for shorter riders?
The 2017 KTM 390 Duke has a seat height of 830 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2017 KTM 390 Duke have?
The 2017 KTM 390 Duke uses Single 320 mm disc, 4 piston radial caliper at the front and Single 230 mm disc 1 piston caliper at the rear.
What tyre sizes does the 2017 KTM 390 Duke use?
The 2017 KTM 390 Duke runs 110/70 -17 front and 150/60-17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2017 KTM 390 Duke have?
The 2017 KTM 390 Duke is fitted with a 6 Speed transmission.
KTM 390 Duke Spec Evolution
The KTM 390 Duke was produced across 6 model years (2014-2024). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2014 |
2016 |
2018 |
2020 |
2021 |
2024 |
| Max Power |
32 kW / 43.5 hp @ 9500 rpm |
32 kW / 43.5 hp @ 9500 rpm |
43.5 hp / 32 kW @ 9500 rpm |
43.5 hp / 32 kW @ 9500 rpm |
43.5 hp / 32 kW @ 9500 rpm |
33 kW / 44.3 hp @ 8500 rpm |
| Dry Weight |
139 kg / 306 lbs |
139 kg / 306 lbs |
149 kg / 328 lbs |
149 kg / 328 lbs |
149 kg / 328 lbs |
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| Engine Detail |
Four stroke, single cylinder, DOHC with finger followers, 4 valves per cylinder |
Four stroke, single cylinder, DOHC with finger followers, 4 valves per cylinder |
Four stroke, single cylinder. DOHC with finger followers, 4 valves |
Four stroke, single cylinder. DOHC with finger followers, 4 valves |
Four stroke, single cylinder, DOHC with finger followers, 4 valves |
Four stroke, single cylinder, DOHC with finger followers, 4 valves |
| Seat Height |
800 mm / 31.4 in |
800 mm / 31.4 in |
830 mm / 32.7 in |
830 mm / 32.7 in |
830 mm / 32.7 in |
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| Fuel Capacity |
11 L / 2.9 US gal / 2.4 Imp gal |
11 L / 2.9 US gal / 2.4 Imp gal |
13.4 L / 3.5 US gal / 2.9 Imp gal |
13.4 L / 3.5 US gal / 2.9 Imp gal |
13.4 Litres / 3.5 US gal |
15 L / 4.0 US gal |
| Frame Type |
Steel trellis |
Steel trellis |
Steel trellis frame, powder coated |
Steel trellis frame, powder coated |
Steel trellis frame, powder coated |
Steel trellis frame, powder coated |
| Displacement |
373.4 cc / 22.7 cu-in |
373.4 cc / 22.7 cu-in |
373 cc / 22.7 cu-in |
373 cc / 22.7 cu-in |
373 cc / 22.7 cu-in |
398.7 cc / 24.3 cu-in |
| Wheelbase |
1367 mm / 53.8 in |
1367 mm / 53.8 in |
1357 mm / 53.4 in |
1357 mm / 53.4 in |
1357 mm / 53.4 in |
1357 mm / 53.4 in |
Key Specifications
Engine
Four stroke, single cylinder. DOHC with finger followers, 4 valves
Power
43.5 hp / 32 kW @ 9500 rpm
Torque
3.6 kg-m / 35.3 Nm @7000rpm
Top Speed
Not published by manufacturer
Fuel Capacity
13.4 L / 3.5 US gal / 2.9 Imp gal
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Full 2017 KTM 390 Duke Specifications
Year
2017 - 18
Make Model
KTM 390 Duke
Seat Height
830 mm / 32.7 in
Wheelbase
1357 mm / 53.4 in
Ground Clearance
185 mm / 7.3 in
Dry Weight
149 kg / 328 lbs
Fuel Capacity
13.4 L / 3.5 US gal / 2.9 Imp gal
Displacement
373 cc / 22.7 cu-in
Engine Detail
Four stroke, single cylinder. DOHC with finger followers, 4 valves
Bore x Stroke
89 x 60 mm
Compression Ratio
12.6:1
Cooling System
Liquid Cooled
Fuel Induction
Bosch Injection
Ignition
Bosch EMS
Lubrication
Wet sump
Starter
Electric
Clutch
PASC antihopping clutch, mechanically operated
Final Drive
Chain 5/8 x 1/4" X Ring
Final Drive Ratio
15:45
Primary Drive Ratios
30:80
Transmission / Drive
6 Speed
Frame Type
Steel trellis frame, powder coated
Suspension - Front
WP inverted fork ø 43 mm
Suspension - Rear
WP monoshock
Steering Head Angle
66°
Wheel Travel - Front
142 mm / 5.6 in
Wheel Travel - Rear
150 mm / 5.9 in
Brakes - Front
Single 320 mm disc, 4 piston radial caliper
Brakes - Rear
Single 230 mm disc 1 piston caliper
ABS
Bosch 9MB two-channel ABS
Tyres - Front
110/70 -17
Tyres - Rear
150/60-17
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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