The 2025 KTM 250 SX is the pinnacle of 2-stroke motocross performance. This 250 powerhouse has long been the weapon of choice for top professional and amateur racers seeking uncompromising power, lightweight agility, and proven reliability. If you’re considering adding this feisty orange two-stroke to your garage, here are the answers to 20 key questions about the 2025 KTM 250 SX:
What’s new for 2025?
KTM has refined the 250 SX with several key updates, including revised suspension settings, a reworked frame for improved mass centralization, and an upgraded rear brake system. Electronic fuel injection and electric start continue to be standard features.
How much power does it make?
The liquid-cooled 249cc 2-stroke engine produces an impressive 53 horsepower, delivering an outstanding specific output of 213 hp/litre.
What’s the top speed?
KTM hasn’t released an official top speed figure, but with a curb weight of just 233 lbs (106 kg) and nearly 190 hp/ton, you can expect the 250 SX to reach triple-digit velocities on the right track.
How quickly does it accelerate?
While KTM hasn’t provided 0-60 mph or quarter-mile times, the 250 SX’s lightweight, high-revving 2-stroke powerplant delivers face-melting acceleration that will leave your riding buddies in the dust.
What engine modes are available?
The 250 SX features two selectable engine maps – a more linear “Map 1” and an aggressive “Map 2” for maximum power delivery.
Does it have any electronic rider aids?
No advanced electronics here – just good old-fashioned 2-stroke performance. However, the fuel injection and power valve provide a more user-friendly and controllable power delivery compared to carbureted two-strokes of the past.
How’s the suspension and braking performance?
Fully adjustable WP XACT suspension, with easily accessible clickers, provides exceptional handling and feedback. Powerful Brembo brakes ensure impressive stopping power.
Is it comfortable for everyday use?
With its motocross-focused ergonomics and 37.7-inch seat height, the 250 SX prioritises performance over long-haul comfort. But the roomy riding position should still be tolerable for street use.
What are the styling highlights?
Sleek new bodywork, updated graphics, and the classic KTM orange colourway give the 250 SX an aggressive, race-bred aesthetic.
What’s the fuel tank capacity?
The 250 SX’s fuel tank holds 1.9 gallons, providing a decent range between fill-ups.
What electronic features does it have?
Beyond the fuel injection system and selectable engine maps, the 250 SX keeps things simple, with no fancy TFT displays or Bluetooth connectivity.
Is it suitable for the track?
Absolutely. The 250 SX is a pure motocross weapon, built to excel in the most demanding race conditions.
How much does it cost?
The 2025 KTM 250 SX retails for £9,149 in the UK.
What are the service intervals?
KTM has extended the valve check interval to 37,200 miles (60,000 km), up from the previous model’s 30,000 miles.
How reliable is the 250 SX?
Early owner reviews suggest the 250 SX’s reliability has been improved compared to past models, and KTM offers a 2-year warranty.
What are the maintenance costs like?
KTM estimates an average annual servicing cost of around £350 for the 250 SX.
How does it compare to the 250SX-F four-stroke?
The 250 SX two-stroke offers more raw power and a lower price tag, while the 250SX-F four-stroke is more user-friendly and consistent.
What colour options are available?
The classic KTM orange is the primary colour choice, with a few additional options likely offered as well.
Can I add aftermarket parts?
Yes, the 250 SX is highly customisable, with a wide range of performance and aesthetic upgrades available.
When will the 2025 250 SX be available?
The new model is already in KTM dealerships and ready for you to take home.
If you have any other questions about the 2025 KTM 250 SX, be sure to get in touch with the team at DMC Motorcycles or use the form below. We’d be happy to provide more details and get you set up with a test ride on this legendary two-stroke motocrosser.