Produktinfo

KICKSTART YOUR RACING CAREER

The new KTM 125 SX is the most compact and lightweight of the full-size bikes and delivers a confidence-inspiring ride like no other. A new lightweight chassis teams up with the most competitive 125cc 2-stroke engine to date, delivering superior agility and power to fulfil the demands of any young adrenalin seeker. This 2-stroke screamer is the ultimate entry point into the pro ranks and a sure-fire way to add to the trophy collection.

Motor og eksos

Motor og Eksos

The latest version of the 125 SX engine is once again the most competitive and powerful engine in its class. With an outstanding power-to-weight ratio, low cost and overall simplicity, it is clear that 2-strokes will continue to have a successful future at KTM. The compact and durable 17.2 kg engine was developed using the latest KTM engineering know-how, resulting in broad power across the rev range. Its easy rideability and outstanding performance are benefits that equate to faster lap times and better results.

TRANSMISSION

The KTM 125 SX is now fitted with a new, more robust 6-speed transmission. The gear ratios were carried over from the predecessor, but all the gears feature improvements and reinforcements. Another highlight of the 125 SX transmission, is the no dirt gear shifter. Similar to the footpeg design, it prevents the build-up of dirt […]

IGNITION

All 2-stroke models feature a new CDI control unit with an advanced hardware which improves the starting behavior of the engine. The ignition curves remain unchanged.

EXHAUST

When it comes to improved power delivery and performance, the new exhaust plays a key role and packs a punch that is hard to beat. In addition, its new shape provides slimmer ergonomics while still operating safely within the noise limits for racing.

CYLINDER

At the heart of the 125cc engine is a reworked cylinder with a 54 mm bore. It features an improved power valve unit with a sophisticated mechanism designed for the lateral support exhaust ports. The new exhaust port layout increases engine performance, while the upper contour of the exhaust port has been machined to ensure […]

CRANKCASES AND ENGINE COVERS

The lightweight engine cases are manufactured using a high pressure die-cast production process, keeping wall thickness to a minimum while retaining strength and durability. The design allows for a high crankshaft position which is located close to the center of gravity, resulting in optimal mass centralization and easier ride-ability. The engine body is extremely compact, […]

CARBURETOR

The KTM 125 SX is fitted with a MIKUNI TMX carburetor. The settings on the 38mm flat slide carburetor have been adapted to suit the new airbox, providing smooth, controllable power all the way through the rev range.

Chassi

Chassi

To heighten the highly energized riding experience of a 125cc 2-stroke, KTM developed a new chassis that is light and responsive enough to enhance its dynamic reputation. For 2019, the KTM 125 SX features a new lightweight, high-tech steel frame that not only responds accurately to rider input, but has also been optimized for better rider feedback. The new flex characteristics help the bike to soak up those big hits while also delivering excellent agility and high-speed stability. As a whole, this new chassis allows the rider to be 100% in charge of the ride.

WHEELS

KTM uses lightweight, CNC-machined hubs and high-end Excel rims on all SX models, guaranteeing maximum stability and minimum weight. For 2019, the aluminum spoke nipples feature a reworked design, which conveniently reduces the frequency with which the spokes need to be tightened. The wheels are fitted with the latest Dunlop Geomax MX 3S tires, delivering […]

TRIPLE CLAMP

All SX models feature top quality, CNC-machined triple clamps and have become somewhat of a KTM trademark. For 2019, the triple clamp has been reworked with stiffer upper clamps (22 mm offset for all models) to suit the reworked frame stiffness and flex characteristics of the latest WP AER forks. The result is a front […]

SWINGARM

The new KTM 125 SX one-piece swingarm, is manufactured using a gravity die-cast production process, offering exceptional strength at the lowest possible weight. The reshaped axle slot provides an additional 5 mm of axle adjustment, which allows the wheel to be set further back, for improved straight-line stability on really rough tracks. The chain measurement […]

REAR SUSPENSION

All SX models feature a DDC monoshock, which has been developed to work as a complete unit with the entire frame and swingarm architecture, as well as the linkage system and the AER 48 forks. It features high-quality machined and anodized components, which add a touch of class and give it appeal beyond just a […]

FUEL TANK

All models in the SX range are fitted with newly designed lightweight polyethylene fuel tanks. The fuel capacity on the full-size SX models is still 7 liters, but the new shape improves the ergonomics. The filler cap has an inside thread that makes for easy and reliable closure.

FRONT SUSPENSION

All full-size SX models are fitted with the super-lightweight WP AER 48 front fork. It is a 48 mm USD air-sprung fork with separate functions for each fork leg, meaning damping functions are on the right side and the air spring is on the left. The left leg features a two-chamber system with a capsuled […]

FRAME

The all-new frame and subframe on the KTM 125 SX cater to the aggressive riding styles associated with 125cc racing. For this reason, as with the rest of the SX range, the frame is professionally crafted from hydro formed Chromium Molybdenum steel tubes that are robot welded, ensuring the highest levels of consistent quality. Improved […]

BRAKES

High-tech Brembo brakes have always been standard equipment on all KTM motocross bikes. Combined with lightweight wave discs, the renowned system provides the highest level of braking efficiency, enabling you to always out-brake the competition.

AIRBOX

The new airbox on the KTM 125 SX has been completely reworked to ensure better flow dynamics, resulting in optimal power and throttle response. Despite the obvious performance enhancements, the new design also offers maximum protection against soiling of the air filter. The large Twin-Air air filter is mounted on a cleverly designed stiff cage […]

Ergonomi og komfort

Ergonomi og komfort

Momentum is crucial when laying down fast laps on a 125cc. The ability to shift your weight quickly and easily to work in perfect harmony with the motorcycle is key to maximizing flow. KTM has focused extensively on the optimal ergonomics for high-level performance, ensuring a riding position that offers the best control and, with the option of several handlebar positions, can be adjusted to suit every rider and condition. The way a rider interacts with the bodywork, seat, footpegs and handlebars is to balance and control. For this reason, no compromises were made in these important areas and only the best quality products and designs were used. Sitting on the 2019 KTM 125 SX gives the rider a definite sense of control and this is immediately confirmed the moment he hits the track.

SEAT

All SX models have a newly shaped seat, designed to match the improved ergonomics. The seat cover features newly developed silicone strips that provide better feel and grip for the rider. The seat is conveniently fixed to the bike using one long, lateral screw, making it safe and easy to handle.

HANDLEBAR

All full-size SX models are equipped with the same high-strength aluminum tapered handlebar, made by NEKEN. The handlebar is fixed in rubber damped mountings, which allow for two different positions. The handlebars come standard with an ODI vulcanized grip on the right side and a comfortable ODI lock-on grip, which does not require any wire […]

FOOTPEGS

Sophisticated ´No Dirt´ footpegs prevent smudging up the pegs, even when digging in deep ruts. Looking for a higher riding position? Then just mount the footpegs of the MY2018 EXC models, which are 6mm higher than the SX versions.

Bodywork og dekaler

Bodywork og dekaler

125 cc riders are renowned for riding with the most aggressive body language. Young, determined athletes riding with exuberant style and pushing themselves and their machines to the limit. This critical consideration went into the development of the bodywork of the KTM 125 SX and was factored into the entire 2019 SX range. By using input from KTM factory riders, KTM R&D as well as Kiska Design, the new bodywork of the KTM 125 SX achieves complete harmony between rider and bike. The main goal was to provide the perfect contact points for the rider, allowing him to move as freely as his spirit demands, with the control to match his intentions. The bodywork is full of intelligent design elements, like the I-beam structure on the front and rear fenders, which guarantee maximum stability with the lowest possible weight. The new modern design and graphics portray an impressively fast and aggressive look that sends a clear message to the competition.

DECALS

The 2019 SX models feature the latest in-mold graphics, matching the new bodywork perfectly. They have a fast and aggressive style that screams READY TO RACE, leaving no doubt as to the bikes’ high-performance intentions.

Programvare og elektronikk

Programvare og elektronikk

Absolute performance purity is the name of the game when it comes to electronics and the new KTM 125 SX. Undiluted 2-stroke simplicity, with an hour meter to keep a check on how long you’ve been shredding and an optional rev counter to assist with perfect setup.

Tekniske detaljer

TECH DETAILS

Engine
Design
1-cylinder, 2-stroke engine
Displacement
124.8 cm³
Bore
54 mm
Stroke
54.5 mm
Starter
Kickstarter
Transmission
6-speed
Clutch
Wet multi-disc clutch, hydraulically actuated
EMS
Kokusan
Chassis
Frame design
25CrMo4 steel central-tube frame
Front suspension
WP-USD, AER 48, Ø 48 mm
Rear suspension
WP shock absorber with linkage
Suspension travel (front)
310 mm
Suspension travel (rear)
300 mm
Front brake
Disc brake
Rear brake
Disc brake
Front brake disc diameter
260 mm
Rear brake disc diameter
220 mm
Chain
5/8 x 1/4″
Steering head angle
63.9 °
Ground clearance
375 mm
Seat height
950 mm
Tank capacity (approx.)
7.5 l
Weight READY TO RACE (without fuel)
87.5 kg
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