2021 KTM 390 Duke Specifications

Name: 2021 KTM 390 Duke
Brand: KTM

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2021 KTM 390 Duke Overview

The 2021 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. 2021 KTM 390 Duke delivers 43.5 hp @ 9500 rpm of peak power and 37 Nm @ 7000rpm of torque. From a practical standpoint, the 2021 390 Duke tips the scales at 149 kg, carries a 13.4-litre fuel tank, offers a seat height of 830 mm and spans a 1357 mm wheelbase. Scroll down for the complete 2021 KTM 390 Duke spec sheet covering every technical detail from suspension travel to tyre sizes.

2021 390 Duke - Pros & Cons

Strengths

Strong power output: 2021 KTM 390 Duke makes 43.5 hp @ 9500 rpm with 37 Nm @ 7000rpm of torque - competitive figures for its class.

Considerations

Tall seat height: The 830 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.

Owner Experiences & Common Issues

General ownership notes

The 2021 KTM 390 Duke has built a reputation for solid everyday reliability when serviced to schedule. As with any motorcycle of this era, documented service history is the single biggest indicator of long-term reliability when buying used.

390 Duke - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2021 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.

2021 KTM 390 Duke - Frequently Asked Questions

What engine does the 2021 KTM 390 Duke have?

The 2021 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 2021 KTM 390 Duke weigh?

The 2021 KTM 390 Duke weighs 149 kg. This is the manufacturer's dry figure.

How much power does the 2021 KTM 390 Duke make?

The 2021 KTM 390 Duke produces 43.5 hp @ 9500 rpm of power and 37 Nm @ 7000rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2021 KTM 390 Duke?

The 2021 KTM 390 Duke has a 13.4-litre fuel tank.

Is the 2021 KTM 390 Duke suitable for shorter riders?

The 2021 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 2021 KTM 390 Duke have?

The 2021 KTM 390 Duke uses Single 320 mm disc, 4 piston radial fixed caliper at the front and Single 230 mm disc, 1 piston floating caliper at the rear.

What tyre sizes does the 2021 KTM 390 Duke use?

The 2021 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 2021 KTM 390 Duke have?

The 2021 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

37 Nm / 27.2 lb-ft @ 7000rpm

Top Speed

N/A

Weight

149 kg / 328 lbs

Fuel Capacity

13.4 Litres / 3.5 US gal

Full 2021 KTM 390 Duke Specifications

Year 2021

Make Model KTM 390 Duke

Max Power 43.5 hp / 32 kW @ 9500 rpm

Max Torque 37 Nm / 27.2 lb-ft @ 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

Emissions EURO5

Fuel Induction Bosch Injection

Ignition Bosch EMS with RBW

Lubrication Wet sump

Starter Electric

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2021 KTM 390 Duke Specifications

2021 KTM 390 Duke Overview

2021 390 Duke - Pros & Cons

Strengths

Considerations

Owner Experiences & Common Issues

General ownership notes

390 Duke - Buying & Maintenance Guide

What to check before buying

Oil and filter changes

2021 KTM 390 Duke - Frequently Asked Questions

KTM 390 Duke Spec Evolution

Key Specifications

Full 2021 KTM 390 Duke Specifications

Compare KTM 390 Duke

390 Duke Years

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KTM 390 Duke - other years