2020 KTM 390 Duke Specifications

Name: 2020 KTM 390 Duke
Brand: KTM

Sport • Specs last verified 13 July 2026

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2020 KTM 390 Duke Overview

KTM 390 Duke is a sport motorcycle, displacing 373 cc. Power comes from a Four stroke, single cylinder. DOHC with finger followers, 4 valves engine, a compression ratio of 12.6:1. On the performance side, it delivers 43.5 hp @ 9500 rpm of peak power and 3.6 kg-m of torque. On the road, the 2020 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. The full 2020 KTM 390 Duke spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2020 390 Duke - Pros & Cons

Strengths

Strong power output: With 43.5 hp @ 9500 rpm and 3.6 kg-m of torque on tap, the 390 Duke is no slouch for its class.
Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.

Considerations

Tall seat height: At 830 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.

Wear Points & Servicing Notes

Cooling system servicing

390 Duke's Liquid Cooled setup is low-maintenance provided the coolant interval is kept - old, acidic coolant is the main cause of long-term corrosion in the water passages.

Fuelling & injector care

The Bosch Injection on the 390 Duke needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.

Brake disc and pad wear

Braking up front comes from Single 320 mm disc, 4 piston radial caliper - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The 390 Duke's suspension runs WP inverted fork ø 43 mm at the front. The rear uses WP monoshock. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The 390 Duke uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.

Frame & chassis check

Built around a Steel trellis frame, powder coated, the 390 Duke's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

390 Duke - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2020 KTM 390 Duke, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy 390 Duke should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects a 390 Duke's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the 390 Duke needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.

2020 KTM 390 Duke - Frequently Asked Questions

What engine does the 2020 KTM 390 Duke have?

The 2020 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 2020 KTM 390 Duke weigh?

The 2020 KTM 390 Duke weighs 149 kg. This is the manufacturer's dry figure.

How much power does the 2020 KTM 390 Duke make?

The 2020 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 2020 KTM 390 Duke?

The 2020 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 2020 KTM 390 Duke suitable for shorter riders?

The 2020 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 2020 KTM 390 Duke have?

The 2020 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 2020 KTM 390 Duke use?

The 2020 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 2020 KTM 390 Duke have?

The 2020 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	-
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	-
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

Weight

149 kg / 328 lbs

Fuel Capacity

13.4 L / 3.5 US gal / 2.9 Imp gal

Full 2020 KTM 390 Duke Specifications

Year 2019 - 20

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

Max Power 43.5 hp / 32 kW @ 9500 rpm

Max Torque 3.6 kg-m / 35.3 Nm @7000rpm

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.