All it takes is one hard, fast rip into a loamy berm to know that the 2023 KTM 125 SX is a serious contender in the 125 cc race. Not only has the 'Ring-ting-ting' been given a fuel-injected revival, but the entire motorcycle also benefits from class-leading developments at every end. Boasting accolades such as being the leader in 2-stroke motocross innovation in the modern era, the 2023 KTM 125 SX simply slays the rest of the 125 cc class. All you need do is prod the starter, blip the throttle and let rip.
EASY SUSPENSION ADJUSTMENT
Get dialed in! The 2023 KTM SX range boasts totally tool-free suspension setup at both ends. Thanks to an all-new shock absorber design featuring hand-adjustable dual compression control, it allows riders to adjust high- and low-speed settings in a matter of seconds. On the front end, the forks are also easily adjusted thanks to a single air pressure preload valve, as well as through easy access click adjusters for compression and rebound. We'll even throw the air pump in as standard.
NO JETS - ONLY ROCKET SHIPS
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 all-new Keihin EFI and reed valve case design, you can be guaranteed of laying down optimal power at any altitude, all of the time.
CHUGGA CHUGGA, RING DING DING!
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 2023 KTM 125 SX. Thanks to a 12,8V 2 Ah lithium ion battery is placed under the rider’s seat, a new high-quality stator & pickup and super robust design, the only thing you'll be kicking - is ass.
SMOOTHER POWER DELIVERY
EFI + POWER VALVE
With EFI comes great rideability. Along with the electronic fuel injection, a new power valve has also been fitted to the KTM 125 SX, allowing for more usable power throughout the rev range. Smoother power means better traction. Better traction means holeshot heaven!
UNMATCHED PERFORMANCE
Designed to churn out more torque than any 125 cc 2-stroke engine to ever come before it, the 2023 KTM 125 SX is set to continue its dominance in its class with unrelenting forward momentum. With an overall engine weight of only 17.86 kg and impressive horsepower figures, this lightweight powerplant retains its typical high-revving character, while laying down the grunt where it matters most.
PICK YOUR POWER - SELECTABLE MAPS
Once again slicing into the 125 cc class with the leading edge of technology, the 2023 KTM 125 SX features a map select switch allowing the racer to switch between 2 engine maps.
SLEEKER FOR YOU TO SCRUB CLEANER
ABSOLUTE CONTROL
No matter how gnarly the track is, you'll stay in complete control thanks to an all-new frame design that has not only been engineered for longitudinal rigidity but also repositions rotating mass closer to the center of gravity. A new shock mounting also provides improved anti-squat behavior to better traction out of corners, while the footpeg mounting position has moved inwards for less risk of hooking up in deep ruts or when scrubbing jumps.
FLUID RIDER MOTION
ERGONOMICS
The 2023 KTM SX and SX-F range feature an entirely new and improved rider triangle, providing improved knee contact - especially when standing on the pegs - with improved gripping surfaces all around. New plastics work to expel mud buildup in wet, muddy conditions, with a new, flatter seat profile and high grip seat cover providing exceptional rider movement and control. The polyamide reinforced aluminum subframe further enhances rider feel and feedback.
HARNESSING GRAVITY
MASS CENTRALIZATION
With a major emphasis placed on mass centralization, the 2023 KTM 125 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.
GRIP AND LET RIP
TRACTION
Ready to rip your arms out of the sockets? Together with the benefits of mass centralization and overall reduced weight, the anti-squat behavior of the chassis is significantly improved by changing the backbone of the steel frame concept. In layman's terms, the 2023 KTM 125 SX gets its power down perfectly when tearing out of corners.
UNFLAPPABLE FRONT END
WP XACT FORK
48mm air type WP XACT front fork with a split damping function provides all the confidence you need to attack the track. New hydrostops in the fork legs improve bottoming-out resistance and account for less rebound when attacking big jumps, bumps, and thumps. Redesigned fork protection rings also increase protection against dirt, making them as reliable as they are awesome.
RACING ON RAILS
STABILITY
The 2023 KTM 125 SX is rock-solid at any speed thanks to a repositioned and forged steering head connection and CNC milled triple clamps. Made from high-grade aluminum, these feature optimally tuned steering stem stiffness, perfect alignment of the fork tubes, and precise geometry of the fork clamps to ensure highly responsive and smooth fork action - not to mention unwavering stability when charging across ruts and onto the podium.
UNOBTRUSIVE IMPACT
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.
NOTHING TO HOLD YOU BACK
GROUND CLEARANCE
No one enjoys a bad hook-up. Luckily, the all-new frame and shock absorber geometry on the 2023 KTM 125 SX improve ground clearance of the linkage, with all-new topology optimized die-cast footpegs that are less susceptible to hooking on deep ruts, and take-offs when scrubbing.
PRECISE, LAP AFTER LAP
CONSISTENCY
A new WP XACT shock absorber provides unmatched consistency lap after lap, thanks to low-friction SKF linkage seals and advanced damping characteristics for unsurpassed traction and energy absorption.
125 SX
Offer Ends 30/06/2024
KTM - SCRUB THE VAT - Get serious with serious savings on KTM MY23 Motocross Range | Savings of up to £1,812
Get serious with serious savings and KTM MY23 Motocross range
SCRUB THE VAT
It’s never too late to get serious about your motocross riding. Getting serious means getting on board class leading machinery to give you every advantage for when the gate drops. The KTM 2023 SX range, bursting with new innovation, design and technology, does exactly that – propelling you to push your limit to levels you never thought possible.
Talking about limits, KTM has just lowered the limit to enter this Orange world of improved power and control with VAT equivalent savings* now available on the entire adult SX range and the class dominating 85 SX.
In 2023 the unmatched KTM two-stroke range of the 85 SX, 125 SX and 250 SX are joined by the mind-blowing 300 SX. These mighty machines offer maximum power with minimum weight giving you all the advantages you’ll ever need. Your only decision is to pick your weapon of choice.
The last word in four stroke motocross machinery is the KTM triumvirate of the relentless 250 SX-F, the irrepressible 350 SX-F and the dominant 450 SX-F – the later also available as a stunning Factory Edition. All new in 2023, this trio boasts an embarrassment of riches in terms of performance and achievements – and with features such as launch control, traction control and Quickshifter all standard there is no easier upgrade to your riding.
With savings of up to a massive £1,812 to be made, it’s certain that these machines will not last long. Before your competition beats you to it, head to the dealership to Get Serious and Scrub the VAT.
Finance Example based on 4,000 miles per year Excess mileage charge 14.9p per mile. Finance is also available as a Purchase Plan. See end of page for terms and conditions.
KTM MY23 MOTOCROSS MODEL | SAVING | KTM VAT FREE* PRICE |
85 SX SMALL WHEEL 2023 | £987 | £4,933 |
85 SX BIG WHEEL 2023 | £987 | £4,933 |
125 SX 2023 | £1,370 | £6,850 |
250 SX 2023 | £1,504 | £7,516 |
300 SX 2023 | £1,554 | £7,766 |
250 SX-F 2023 | £1,554 | £7,766 |
350 SX-F 2023 | £1,595 | £7,975 |
450 SX-F 2023 | £1,637 | £8,183 |
450 SX-F FACTORY EDITION | £1,812 | £9,058 |
*VAT Free pricing refers to the removal of the VAT element from the suggested retail price. VAT will be paid on the promotional price of the motorcycle. Cannot be used in conjunction with any other promotion. We reserve the right to withdraw this offer at any time. Offer only applies to model year 2023 machines. This offer is available at all participating Authorised KTM UK Dealers, while stocks last.
The illustrated vehicles may vary in selected details from the production models and some illustrations feature optional equipment available at additional cost. All information concerning the scope of supply, appearance, services, dimensions and weights is non-binding and specified with the proviso that errors, for instance in printing, setting and/or typing, may occur; such information is subject to change without notice. Please note that model specifications may vary from country to country. In the case of coated surfaces, there may be color differences due to the usual process fluctuations. The consumption values stated refer to the roadworthy series condition of the vehicles at the time of factory delivery.
Transmission | 6-speed |
Starter | Kickstarter |
Stroke | 54.5 mm |
Bore | 54 mm |
Clutch | Wet multi-disc DS clutch, Brembo hydraulics |
CO2 Emissions | |
Displacement | 124.8 cm³ |
EMS | Kokusan |
Design | 1-cylinder, 2-stroke engine |
Weight (without fuel) | 87.5 kg |
Tank Capacity (Approx.) | 7.5 l |
ABS | |
Front Brake Disc Diameter | 260 mm |
Rear Brake Disc Diameter | 220 mm |
Front Brake | Disc brake |
Rear Brake | Disc brake |
Chain | 5/8 x 1/4" |
Frame Design | Central double-cradle-type 25CrMo4 steel |
Front Suspension | WP XACT-USD, Ø 48 mm |
Ground Clearance | 375 mm |
Rear Suspension | WP XACT Monoshock with linkage |
Seat Height | 950 mm |
Steering Head Angle | 63.9 ° |
Suspension Travel (Front) | 310 mm |
Suspension Travel (Rear) | 300 mm |
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