2020 KTM 125 Duke Specifications

Name: 2020 KTM 125 Duke
Brand: KTM

Sport • Specs last verified 13 July 2026

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2020 KTM 125 Duke Overview

The 2020 KTM 125 Duke is a sport motorcycle built around 124.7 cc of displacement. Under the tank sits a Four stroke, single cylinder, DOHC, 4 valves engine, a compression ratio of 14.5:1. 2020 KTM 125 Duke delivers 11.3 kW @ 10500 rpm of peak power and 12 Nm @ 8000 rpm of torque. From a practical standpoint, the 2020 125 Duke tips the scales at 141.4 kg, carries a 11-litre fuel tank, offers a seat height of 818 mm and spans a 1357 mm wheelbase. That's roughly 61.3 kg lighter than the average sport motorcycle in our database. Scroll down for the complete 2020 KTM 125 Duke spec sheet covering every technical detail from suspension travel to tyre sizes.

2020 125 Duke - Pros & Cons

Strengths

Strong power output: 2020 KTM 125 Duke makes 11.3 kW @ 10500 rpm with 12 Nm @ 8000 rpm of torque - competitive figures for its class.
Fuel injection: The Bosch electronic fuel injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.

Considerations

Modest fuel capacity: The 11-litre tank means more frequent fuel stops on longer rides, which is worth planning around on touring routes.
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 125 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 electronic fuel 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 300 mm disc, 4 piston radial fixed 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 125 Duke runs 43 mm WP-USD, AER 43 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.

125 Duke - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2020 KTM 125 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 125 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 125 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 125 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.

2020 KTM 125 Duke - Frequently Asked Questions

What engine does the 2020 KTM 125 Duke have?

The 2020 KTM 125 Duke uses a Four stroke, single cylinder, DOHC, 4 valves engine with 124.7 cc of displacement. It is liquid cooled.

How much does the 2020 KTM 125 Duke weigh?

The 2020 KTM 125 Duke weighs 141.4 kg. This is the manufacturer's dry figure.

How much power does the 2020 KTM 125 Duke make?

The 2020 KTM 125 Duke produces 11.3 kW @ 10500 rpm of power and 12 Nm @ 8000 rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2020 KTM 125 Duke?

The 2020 KTM 125 Duke has a 11-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 183-220 km between stops.

Is the 2020 KTM 125 Duke suitable for shorter riders?

The 2020 KTM 125 Duke has a seat height of 818 mm. This is a moderate seat height that suits a wide range of rider heights.

What brakes does the 2020 KTM 125 Duke have?

The 2020 KTM 125 Duke uses Single 300 mm disc, 4 piston radial fixed caliper at the front and Single 230 mm disc, single piston floating caliper at the rear.

What tyre sizes does the 2020 KTM 125 Duke use?

The 2020 KTM 125 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 125 Duke have?

The 2020 KTM 125 Duke is fitted with a 6 Speed transmission.

KTM 125 Duke Spec Evolution

The KTM 125 Duke was produced across 7 model years (2012-2024). 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	2012	2014	2016	2018	2020	2021	2024
Max Power	11.3 kW / 15 hp @ 10500 rpm	11.3 kW / 15 hp @ 10500 rpm	11.3 kW / 15 hp @ 10500 rpm	11.3 kW / 15 hp @ 10500 rpm	11.3 kW / 15 hp @ 10500 rpm	11.3 kW / 15 hp @ 10500 rpm	11 kW / 15 hp
Dry Weight	127 kg / 280 lbs	127 kg / 280 lbs	127 kg / 280 lbs	137 kg / 302 lbs	141.4 kg / 311.7 lbs	139 kg / 306.4 lbs	154 kg / 306.4 lbs
Engine Detail	Four stroke, single cylinder, DOHC, 4 Valves	Four stroke, single cylinder, DOHC, 4 Valves	Four stroke, single cylinder, DOHC, 4 Valves	Four stroke, Single cylinder, DOHC, 4 Valve	Four stroke, single cylinder, DOHC, 4 valves	Four stroke, single cylinder, DOHC, 4 valves	Four stroke, single cylinder, DOHC, 4 valves
Seat Height	810 mm / 31.8 in	810 mm / 31.8 in	810 mm / 31.8 in	830 mm / 32.7 in	818 mm / 32.2 in	830 mm / 32.7 in	800 mm / 32.7 in
Fuel Capacity	11 Litres / 2.9 US gal / 2.4 Imp gal	11 Litres / 2.9 US gal / 2.4 Imp gal	11 Litres / 2.9 US gal / 2.4 Imp gal	13.4 Litres / 3.5 US gal / 2.9 Imp gal	11 Litres / 3.0 US gal	13.4 Litres / 3.5 US gal	-
Displacement	124.7 cc / 7.6 cu-in	124.7 cc / 7.6 cu-in	124.7 cc / 7.6 cu-in	124.7 cc / 7.6 cu-in	124.7 cc / 7.6 cu-in	124.7 cc / 7.6 cu-in	124.9 cc / 7.6 cu-in
Frame Type	Space frame in chrome -molybdenum steel tubes Subframe: steel	Space frame in chrome -molybdenum steel tubes Subframe: steel	Space frame in chrome -molybdenum steel tubes Subframe: steel	Steel trellis frame, powder coated	Steel trellis frame, powder coated	Steel trellis frame, powder coated	Steel trellis frame, powder coated
Brakes - Front	Single 280 mm disc	Single 280 mm disc	Single 280 mm disc	Single 300 mm disc, 4 piston radial fixed caliper	Single 300 mm disc, 4 piston radial fixed caliper	Single 300 mm disc, 4 piston radial fixed caliper	Single 320 mm disc, 4 piston radial fixed caliper

Key Specifications

Engine

Four stroke, single cylinder, DOHC, 4 valves

Power

11.3 kW / 15 hp @ 10500 rpm

Torque

12 Nm / 8.85 ft-lb @ 8000 rpm

Top Speed

Not published by manufacturer

Weight

141.4 kg / 311.7 lbs

Fuel Capacity

11 Litres / 3.0 US gal

Full 2020 KTM 125 Duke Specifications

Year 2019 - 20

Make Model KTM 125 Duke

Seat Height 818 mm / 32.2 in

Wheelbase 1357 mm / 53.4 in

Ground Clearance 155 mm / 6.1 in

Dry Weight 141.4 kg / 311.7 lbs

Fuel Capacity 11 Litres / 3.0 US gal

Max Power 11.3 kW / 15 hp @ 10500 rpm

Max Torque 12 Nm / 8.85 ft-lb @ 8000 rpm

Displacement 124.7 cc / 7.6 cu-in

Engine Detail Four stroke, single cylinder, DOHC, 4 valves

Bore x Stroke 58 x 47.2 mm

Compression Ratio 14.5:1

Cooling System Liquid cooled

Emissions EURO5

Fuel Induction Bosch electronic fuel injection

Ignition Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment

Lubrication Wet sump

Starter Electric

Clutch Wet multi-disc, mechanically actuated

Final Drive Chain 520 X-ring

Transmission / Drive 6 Speed

Frame Type Steel trellis frame, powder coated

Suspension - Front 43 mm WP-USD, AER 43

Suspension - Rear WP Monoshock

Steering Head Angle 65°

Wheel Travel - Front 140 mm / 5.5 in

Wheel Travel - Rear 162 mm / 6.4 in

Brakes - Front Single 300 mm disc, 4 piston radial fixed caliper

Brakes - Rear Single 230 mm disc, single piston floating caliper

ABS Bosch 10 ML Single 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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