Model Description


It’s back! After a 2-year absence, the 2025 KTM 150 SX is once again ready to tear into your favorite MX track. Get ready to experience what it feels like to be a marble launched from a slingshot. The KTM 150 SX pulls hard from the bottom, gallops in the middle, and sings at the top. Which is where it belongs.

EASY SUSPENSION ADJUSTMENT
As always, the suspension boasts an easy tool-free setup at both ends, ensuring you chase down the podium in total control. On the rear, a hand-adjustable dual compression control allows riders to adjust high- and low-speed settings in a matter of seconds. The forks on the front end are also easily adjusted thanks to hand-adjustable clickers on the bottom of the fork shoe and top cap.

ELECTRONIC FUEL INJECTION
Pre-mix gets a remix across the 2-stroke KTM SX range, with Electronic Fuel Injection setting the standard. Now there’s no more fiddly jetting setup pre-race, And thanks to the Keihin EFI and reed valve case design, you can be guaranteed of laying down optimal power at any altitude, all of the time. 

ELECTRIC START
Picture this; You’re 7 laps into an absolute ripper of a race. You miss your line and end up stalling in a deep rut. But you don’t sweat it. All you do is press the starter button and you blast off again to take the final flag. This is the reality on the 2025 KTM 150 SX. Thanks to a 12,8V 2 Ah lithium ion battery is placed under the rider’s seat, a high-quality stator & pickup and super robust design, the only thing you’ll be kicking – is ass. 

EFI AND POWER VALVE
With EFI comes great rideability. Along with the electronic fuel injection and a power valve on the KTM 150 SX, allowing for more usable power throughout the rev range. Smoother power means better traction. Better traction means holeshot heaven!

PERFORMANCE
Many parts of the 150 SX engine have been rearranged, modified, or developed from the ground up. With an overall weight of just below 18 kg, this is a powerhouse bar none. Designed to provide more torque than its stablemate, the KTM 125 SX, it remains true to its nature, without losing its typical high-revving lightweight 2-stroke character. 

SELECTABLE MAPS
The 2025 KTM 150 SX features a map select switch allowing the racer to switch between 2 engine maps. The White Map – or Map 1 – provides a linear, predictable power delivery ideally suited to attack hard-packed dirt with a leaner air-fuel mixture. Alternatively, the Green Map – Mapping 2 – is tuned for loose, thick sandy conditions with a richer mix. 

ABSOLUTE CONTROL
Get ready for a full-on berm assault. The 2025 KTM SX and SX-F machines have received major frame updates directly from Factory Racing efforts. For starters, the frame area around the rear shock mount has been updated and made more streamlined, with new engine mounts and cut-outs for improved chassis flex. The front area of the frame is also updated. with a different wall thickness than the previous model year, with renewed engine mounts. This adds up to a 300g weight saving and improved flex for better cornering. 

ERGONOMICS
Upgraded tank shrouds using bi-compound plastics channel air towards the radiators more efficiently, while a new fuel tank roll, makes for a tighter, more secure fitment, reducing the chance of frame scrubbing and dramatically improving durability. All this works alongside the specially-developed rider triangle, to provide unmatched knee contact and gripping surfaces – especially when standing on the pegs. 

MASS CENTRALIZATION
With a major emphasis placed on mass centralization, the 2025 KTM 150 SX engine is designed to centralize rotating mass for optimal operation with the chassis. This results in a lighter, more agile handling feel, which together with more torque and smoother power delivery, make it the most competitive 125 cc motocrosser yet. 

UPDATED SUSPENSION SETTINGS
For 2025, the KTM SX and SX-F range has given the WP XACT AER fork and WP XACT rear shock an update. This means you’ll be lining up at the setting gate with re-tuned settings, reduced weight, improved weight distribution, and an increase in overall response. 

WP XACT FORK
Let’s get the technical parts out of the way first; the 48 mm WP XACT AER forks fitted to the 2025 KTM SX and SX-F line-up features a capsulated air spring and pressurized oil chamber for progressive and consistent damping, while oil and air bypasses reduce pressure peaks. In combination with the mid-valve damping system, all this provides exceptional feedback and rider comfort. The fork also boasts new settings, which not only compliment the updated frame and rear linkage, but ensures stellar performance at all levels. Speaking of settings, these are easily adjusted via a single air pressure pre-load valve, as well as easy-access click adjusters for compression and rebound. Additionally, the air pump needed to adjust the fork’s air pressure is provided as standard in the buy-pack. 

WP XACT SHOCK
Keeping things in check at the rear, the WP XACT rear shock has also undergone some changes for 2025 using settings directly from the KTM Factory Racing Teams The improved frame and shock geometry mean more ground clearance at the linkage, making it less susceptible to bottoming out. While we’re on the topic, smaller diameter linkage bolts save weight, while new linkage seals refine rear shock response and advanced damping characteristics. 

STABILITY
An upgraded rear brake pedal finds its way onto the 2025 KTM Motocross range, adding additional stiffness, bending resistance and braking feel to the overall package. At the other end, a forged steering head connection and CNC-milled triple clamps, make for the perfect alignment of the fork tubes. This precise geometry of the fork clamps ensures highly responsive and smooth fork action – not to mention unwavering stability when charging across ruts and onto the podium. 

TIRES
Getting power hooked into the dirt is a tough job. However, hours of research and testing have led the 2025 KTM Motocross range to the Dunlop GEOMAX MX34. Providing unmatched stability and control at the highest level, these rubber hoops feature a new carcass and rubber compound that improves damping and absorption, maintaining performance up to 30% longer. New Progressive Cornering Block Technology also improves grip in the berms, while a new rear pattern with 11% taller and 44% wider center block for increased traction and control everywhere else. Lastly, this unique block arrangement works to dispel mud buildup, ensuring traction in even the muddiest of track conditions. 

CONSISTENCY
A new chain guide and chain guard result in improved durability and minimize the chances of hooking on external objects – especially in extremely muddy conditions while reducing dirt build-up around the swingarm and rear sprocket.

ENERGY ABSORPTION
Besides the expertly crafted, hydro-formed, laser-cut, and robot-welded frame being engineered to provide exceptional rider feedback and straight-line stability, it consists of specifically calculated parameters of longitudinal and torsional flex. This means the frame acts as a “shock absorber” of sorts, making for a less harsh ride, resulting in less rider fatigue over many hard laps.

GROUND CLEARANCE
No one enjoys a bad hook-up. Good thing, then that the shock absorber geometry on the 2025 KTM 150 SX improves ground clearance of the linkage, with the topology-optimized die-cast footpegs being less susceptible to hooking on deep ruts, and take-offs when scrubbing.

Finance Calculator

Model Specification


  • Engine

    Engine Type

    Single cylinder, 2-stroke

    Displacement

    143.9 cc

    Starter

    Electric starter

    Transmission

    6 speed

    Clutch

    Wet multi-disc DS clutch, Brembo hydraulics

    ABS System

    Engine Management System

    Vitesco Technologies EMS

  • Dimensions

    Bore

    58 mm

    Stroke

    54.5 mm

    Ground Clearance (unloaded)

    359 mm

    Seat Height

    958 mm

    Weight (No Fuel)

    92.6 kg

  • Frame

    Frame

    Central double-cradle-type 25CrMo4 steel

    Chain

    520, Non-sealed

    Steering Head Angle

    63.9 degrees

    Tank Capacity

    7.2 litres

  • Suspension

    Front Suspension

    WP XACT (AER) upside-down fork, 48 mm

    Rear Suspension

    WP XACT shock absorber with linkage

    Suspension Travel Front

    310 mm

    Suspension Travel Rear

    300 mm

  • Performance

    Brake System Front

    Disc brake 260 mm

    Brake System Rear

    Disc brake 220 mm

    Power

    Torque

  • Brakes

    Front Brake Disc Diameter

    Rear Brake Disc Diameter

Contact Us

Unit 6, Alphinbrook Court
Exeter, Devon.
EX2 8QR. United Kingdom

Tel: 01392 479 400

Email: info@spmotorcycles.com

A little about Us

SP Motorcycles based in Exeter, Devon, we are proud of our no nonsense attitude to getting you the service you need. Whether it be help with buying your first bike or advice on how to get some extra power.

Finance available to UK residents of 18 or over and is subject to status. Indemnities may be required. Finance provided by Close Brothers Motor Finance. Close Brothers Motor Finance is a trading style of Close Brothers Limited (“CBL”), a subsidiary of Close Brothers Group plc. CBL is registered in England and Wales with company number 195626 and registered office at 10 Crown Place, London EC2A 4FT. Close Brothers Limited is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority. Firm reference number 124750.