2022 KTM 125 SX Specifications

Name: 2022 KTM 125 SX
Brand: KTM

Enduro / Off-Road • Specs last verified 13 July 2026

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2022 KTM 125 SX Overview

For 2022, KTM offers the 125 SX as an enduro / off-road motorcycle with 124.8 cc on tap. The 2022 KTM 125 SX is built around a Single cylinder, two-stroke engine. Internally, bore and stroke are 54 x 54.5 mm. In everyday use, the 2022 125 SX tips the scales at 87.5 kg, carries a 7.50-litre fuel tank and offers a seat height of 950 mm. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2022 KTM 125 SX spec sheet below.

2022 KTM 125 SX compared with other bikes in the Enduro / Off-Road category

Measured against other bikes in the Enduro / Off-Road category in our database (up to 1434 models, one entry per model), the 2022 KTM 125 SX comes out as follows.

With 125 cc, the 125 SX has the joint 171st smallest engine displacement of 1434 bikes in the Enduro / Off-Road category, 74% below the category average of 486 cc.
Seat height of 950 mm is taller than that of 911 of the other 1145 bikes in the Enduro / Off-Road category.
Narrowing the field to the 431 models within five model years of it, the engine displacement of 125 cc is smaller than that of 406 of the other 430.

Versus the 2021 model

Compared with the 2021 model, seat height rose from 850 mm to 950 mm (+100 mm). Displacement is unchanged.

2022 125 SX - Pros & Cons

Strengths

Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Strong front braking: The single disc front brake bites hard and stays consistent - a solid foundation whether it's stock or upgraded with braided lines.

Considerations

Tall seat height: A 950 mm seat puts flat-footing out of reach for a lot of riders - sit on it in person before committing.
Modest fuel capacity: A 7.50-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.

Wear Points & Servicing Notes

Fuelling & injector care

Fuelling on the 125 SX comes from fuel injection. Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.

Brake disc and pad wear

Single disc up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.

Suspension condition on used examples

Suspension duties are handled by WP XACT-USD, Ø 48 mm up front and WP XACT Monoshock with linkage at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.

Final drive maintenance

Chain final drive on the 125 SX means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.

Frame & chassis check

The Central double-cradle-type 25CrMo4 steel chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.

Low-speed handling

The 125 SX's 87.5 kg kerb weight makes low-speed control noticeably less effort than on a heavier machine.

125 SX - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2022 KTM 125 SX with its 124.8 cc enduro / off-road should cover the same ground every time: service history, drivetrain condition, and any oil seepage around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 4 years old, this enduro / off-road is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Start it from cold if you can - a well-kept 125 SX settles to a smooth idle within seconds.

Oil and filter changes

Oil changes are the cheapest insurance you can buy for the 125 SX's 124.8 cc single cylinder, two-stroke - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.

Fuel system care

Injector systems like the 125 SX's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.

2022 KTM 125 SX - Frequently Asked Questions

What engine does the 2022 KTM 125 SX have?

The 2022 KTM 125 SX uses a Single cylinder, two-stroke engine with 124.8 cc of displacement.

How much does the 2022 KTM 125 SX weigh?

The 2022 KTM 125 SX weighs 87.5 kg. This is the manufacturer's dry figure.

What is the fuel tank capacity of the 2022 KTM 125 SX?

The 2022 KTM 125 SX has a 7.50-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 125-150 km between stops.

Is the 2022 KTM 125 SX suitable for shorter riders?

The 2022 KTM 125 SX has a seat height of 950 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 2022 KTM 125 SX have?

The 2022 KTM 125 SX uses single disc at the front and single disc at the rear.

What tyre sizes does the 2022 KTM 125 SX use?

The front tyre size on the 2022 KTM 125 SX is 110-17.

What fuel system does the 2022 KTM 125 SX use?

The 2022 KTM 125 SX uses Injection, providing precise fuelling across the rev range and reliable cold-start behaviour.

KTM 125 SX Spec Evolution

The KTM 125 SX was produced across 21 model years (2003-2023). 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	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
Wet Weight	-	-	-	-	-	-	-	-	104.0 kg / 229.3 lbs	292.1 kg / 643.9 lbs	-	112.0 kg / 246.9 lbs	-	-	-	-	-	-	-	-	-
Dry Weight	93.6 kg / 206.4 lbs	93.6 kg / 206.4 lbs	92.4 kg / 203.7 lbs	92.4 kg / 203.7 lbs	92.4 kg / 203.7 lbs	90.8 kg / 200.2 lbs	90.8 kg / 200.2 lbs	90.8 kg / 200.2 lbs	88.8 kg / 195.8 lbs	91.6 kg / 201.9 lbs	90.8 kg / 200.2 lbs	90.8 kg / 200.2 lbs	90.8 kg / 200.2 lbs	87.8 kg / 193.6 lbs	87.2 kg / 192.2 lbs	87.2 kg / 192.2 lbs	87.5 kg / 192.9 lbs	137 kg / 302.0 lbs	87.5 kg / 192.9 lbs	87.5 kg / 192.9 lbs	92.4 kg / 203.7 lbs
Engine Detail	-	-	-	-	-	-	-	-	-	Reed intake and exhaust control	Reed intake.	Reed intake.	Reed intake.	Reed intake.	Reed intake.	Reed intake.	Reed intake.	-	-	-	-
Engine Type	Single cylinder	Single cylinder	Single cylinder	Single cylinder	Single cylinder	Single cylinder	Single cylinder	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke	Single cylinder, two-stroke
Seat Height	925 mm / 36.4 in.	925 mm / 36.4 in.	925 mm / 36.4 in.	925 mm / 36.4 in.	925 mm / 36.4 in.	960 mm / 37.8 in.	985 mm / 38.8 in.	985 mm / 38.8 in.	992 mm / 39.1 in.	992 mm / 39.1 in.	992 mm / 39.1 in.	992 mm / 39.1 in.	992 mm / 39.1 in.	960 mm / 37.8 in.	960 mm / 37.8 in.	960 mm / 37.8 in.	950 mm / 37.4 in.	-	850 mm / 33.5 in.	950 mm / 37.4 in.	958 mm / 37.7 in.
Fuel Capacity	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	8.00 litres / 2.11 gallons	8.00 litres / 2.11 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.50 litres / 1.98 gallons	7.00 litres / 1.85 gallons	7.00 litres / 1.85 gallons	7.00 litres / 1.85 gallons	7.50 litres / 1.98 US gallons	-	7.50 litres / 1.98 US gallons	7.50 litres / 1.98 US gallons	7.20 litres / 1.90 US gallons
Stroke	2	2	2	2	2	2	2	-	-	-	-	-	-	-	-	-	-	-	-	-	2-stroke
Ground Clearance (mm)	390 mm	390 mm	390 mm	390 mm	390 mm	390 mm	390 mm	390 mm	385 mm	395 mm	395 mm	395 mm	395 mm	375 mm	375 mm	375 mm	375 mm	-	375 mm	375 mm	359 mm

Key Specifications

Engine

Single cylinder, two-stroke

Power

Not recorded

Torque

Not recorded

Top Speed

Not recorded

Weight

87.5 kg / 192.9 lbs

Fuel Capacity

7.50 litres / 1.98 US gallons

Full 2022 KTM 125 SX Specifications

Colours White/orange/blue

Ground Clearance (in.) 14.8 inches

Ground Clearance (mm) 375 mm

Seat Height 950 mm / 37.4 in.

Dry Weight 87.5 kg / 192.9 lbs

Fuel Capacity 7.50 litres / 1.98 US gallons

Power-to-Weight Ratio 0.1714 HP/kg

Bore x Stroke (in,) 2.1 x 2.1 inches

Bore x Stroke (mm) 54.0 x 54.5 mm

Displacement (cc) 124.8 cc

Displacement (ci) 7.62 cubic inches

Engine Type Single cylinder, two-stroke

Fuel System Injection

Engine Lubrication Wet sump

Ignition Kokusan EMS

Starter Kick

Clutch Multi-plate clutch, Brembo hydraulics

Final Drive Chain (final drive)

Gearbox 6-speed

Primary Drive 5/8 x 1/4 (520) O Ring. Primary drive: 22:72.

Frame Type Central double-cradle-type 25CrMo4 steel

Suspension - Front WP XACT-USD, Ø 48 mm

Suspension - Rear WP XACT Monoshock with linkage

Rake 26.1°

Wheel Travel - Front 310 mm / 12.2 in.

Wheel Travel - Rear 300 mm / 11.8 in.

Brakes - Front Single disc

Brakes - Rear Single disc

Tyres - Front 110-17

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.