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2018 KTM 125 XC-W Overview
For 2018, KTM offers the 125 XC-W as an enduro / off-road motorcycle with 124.80 cc on tap. The 2018 KTM 125 XC-W is built around a Single cylinder, two-stroke engine. Internally, bore and stroke are 54 x 54.5 mm. In everyday use, the 2018 125 XC-W tips the scales at 91 kg, carries a 9.50-litre fuel tank, offers a seat height of 960 mm and spans a 1,471 mm wheelbase. That's roughly 107.8 kg lighter than the average enduro / off-road motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2018 KTM 125 XC-W spec sheet below.
2018 125 XC-W - Pros & Cons
Strengths
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Factory engineering: There's nothing exotic about the 2018 KTM 125 XC-W's spec sheet - just solid, proven engineering for what it's meant to do.
Considerations
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Carburetor fuelling: Carburetion is more hands-on than fuel injection - plan on periodic jetting and cleaning as part of routine ownership.
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Tall seat height: A 960 mm seat puts flat-footing out of reach for a lot of riders - sit on it in person before committing.
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Modest fuel capacity: A 9.50-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
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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
Carburetor maintenance
Being carbureted, the 125 XC-W is more sensitive to stale fuel and altitude changes than a fuel-injected bike - a carb clean and rejet restores crisp throttle response after any extended lay-up.
Brake disc and pad wear
Single disc. Brake calipers on floating bearings 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 Xplor PDS shock absorber up front and WP shock absorber 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 XC-W means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The 25CrMo4 steel central-tube frame 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 XC-W's 91 kg kerb weight makes low-speed control noticeably less effort than on a heavier machine.
125 XC-W - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2018 KTM 125 XC-W should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept 125 XC-W settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for a 125 XC-W's engine - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.
Carburetor upkeep
A 125 XC-W that's sat unused is almost always a carb-cleaning job before it runs right again - float bowls and pilot jets first, since they clog before anything else.
2018 KTM 125 XC-W - Frequently Asked Questions
What engine does the 2018 KTM 125 XC-W have?
The 2018 KTM 125 XC-W uses a Single cylinder, two-stroke engine with 124.80 cc of displacement.
How much does the 2018 KTM 125 XC-W weigh?
The 2018 KTM 125 XC-W weighs 91 kg. This is the manufacturer's dry figure.
What is the fuel tank capacity of the 2018 KTM 125 XC-W?
The 2018 KTM 125 XC-W has a 9.50-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 158-190 km between stops.
Is the 2018 KTM 125 XC-W suitable for shorter riders?
The 2018 KTM 125 XC-W has a seat height of 960 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 2018 KTM 125 XC-W have?
The 2018 KTM 125 XC-W uses Single disc. Brake calipers on floating bearings at the front and Single disc. Brake calipers on floating bearings at the rear.
What fuel system does the 2018 KTM 125 XC-W use?
The 2018 KTM 125 XC-W uses Carburettor. Mikuni TMX, providing precise fuelling across the rev range and reliable cold-start behaviour.
What suspension does the 2018 KTM 125 XC-W have?
The 2018 KTM 125 XC-W uses WP Xplor PDS shock absorber up front and WP shock absorber with linkage at the rear.
KTM 125 XC-W Spec Evolution
The KTM 125 XC-W was produced across 3 model years (2017-2019). 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 |
2017 |
2018 |
2019 |
| Fuel Capacity |
9.50 litres / 2.51 gallons |
9.50 litres / 2.51 gallons |
9.50 litres / 2.51 US gallons |
| Displacement (cc) |
124.80 cc |
124.80 cc |
124.8 cc |
| Wheelbase |
1,471 mm / 57.9 in. |
1,471 mm / 57.9 in. |
1471 mm / 57.9 in. |
| Fuel System |
Carburettor. Mikuni |
Carburettor. Mikuni TMX |
Carburettor. Mikuni TMX |
| Final Drive |
Chain |
Chain |
Chain (final drive) |
| Rake |
26.5° |
26.5° |
26.5° |
Key Specifications
Engine
Single cylinder, two-stroke
Power
Not published by manufacturer
Torque
Not published by manufacturer
Top Speed
Not published by manufacturer
Fuel Capacity
9.50 litres / 2.51 gallons
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Full 2018 KTM 125 XC-W Specifications
Colours
Orange/white/black
Ground Clearance (in.)
14.6 inches
Ground Clearance (mm)
370 mm
Seat Height
960 mm / 37.8 in.
Wheelbase
1,471 mm / 57.9 in.
Dry Weight
91 kg / 200.6 lbs
Fuel Capacity
9.50 litres / 2.51 gallons
Bore x Stroke (in,)
2.1 x 2.1 inches
Bore x Stroke (mm)
54.0 x 54.5 mm
Displacement (cc)
124.80 cc
Displacement (ci)
7.62 cubic inches
Engine Type
Single cylinder, two-stroke
Engine Detail
Reed intake.
Fuel System
Carburettor. Mikuni TMX
Starter
Kick
Clutch
Multi-plate clutch, Brembo hydraulics
Final Drive
Chain
Gearbox
6-speed
Primary Drive
13:50. Primary drive: 23:73.
Frame Type
25CrMo4 steel central-tube frame
Suspension - Front
WP Xplor PDS shock absorber
Suspension - Rear
WP shock absorber with linkage
Rake
26.5°
Wheel Travel - Front
300 mm / 11.8 in.
Wheel Travel - Rear
310 mm / 12.2 in.
Brakes - Front Diameter (in.)
10.2 inches
Brakes - Front Diameter (mm)
260 mm
Brakes - Rear Diameter (in.)
8.7 inches
Brakes - Rear Diameter (mm)
220 mm
Brakes - Front
Single disc. Brake calipers on floating bearings
Brakes - Rear
Single disc. Brake calipers on floating bearings
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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