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The KTM 125 SX has displayed insolent health on the market for many years. And in view of the services offered, it has many years ahead of it. A real featherweight in the category, this bike benefits from a compact chassis and a very powerful 125cc 2 stroke that just begs to be called upon.. His tone will wreak havoc.
MOTOR
The latest engine of the KTM 125 SX asserts itself as the most powerful and competitive block in its category and demonstrates that 2-stroke technology has a bright future, thanks to its excellent power-to-weight ratio, its low cost and simplicity. This 125cc engine, the result of KTM’s technical expertise, incorporates the latest technological innovations on the market. Despite a compact structure and a weight of just 17.2kg, it delivers great power over the entire rev range. The pilot has all the assets in hand to start his collection of trophies.
CYLINDER
This ultra-compact cylinder, with a bore of 54mm, features state-of-the-art exhaust control and a sophisticated mechanism for the side carrier exhaust channels. Combined with the two-piece cylinder head, this design is the source of a marked increase in power throughout the range. The arrangement of the water jackets inside the cylinder and the cylinder head allows efficient heat dissipation under heavy load on the engine.
ENGINE CASINGS
KTM engineers designed ultra-light molded crankcases. They have also raised the position of the crankshaft in order to bring it closer to the center of gravity, so as to better centralize the masses and enhance driving pleasure..
CARBURETOR
The KTM 125 SX is fitted with a MIKUNI TMX carburetor. This 38mm flat bushel carburetor allows a clear improvement and a better dosage of power up to the rev limiter. Thanks to a new distributor tube, the carburetor has been rotated by 7 ° in order to limit the risk of fuel overflowing. It is also less sensitive to changes in altitude and variations in temperature..
GEARBOX
Another interesting innovation planned especially for the 2-stroke engine: a robust gearbox offering 6 ratios perfectly adapted to the range of use of the 125. The engineers even reworked the 3rd, 4th and 5th gears to improve reliability. The lightening and shrinking of the engine were made possible through the use of state-of-the-art production technologies. As safety is also an essential parameter, the selector adopts a “zero dirt” design which prevents blocking of the lever joint by soiling..
IGNITION
All 2-cycle models feature a new condenser-discharge ignition control unit and advanced components to improve engine start-up behavior. The ignition curves have not changed.
EXHAUST
Attention has been paid to the resonator to deliver even more power and torque. This engine is a marvel of explosiveness and solidity.
WEIGHT
Year after year, KTM engineers strive to make their motorcycles lighter. The result is clear: the 2018 KTM SX models are among the lightest and slimmest motocross bikes on the market.
AIR FILTER HOUSING
The air filter housing has been designed to better protect the air filter against clogging and to ensure optimum air flow. The cage in which the extra-large Twin Air air filter is housed is completely rigid, which helps to better hold the system in place. The design is so simple that you could replace the filter even with your face covered in mud. And this without the help of any tool. And in a matter of seconds.
FRAMEWORK
The high-tech chrome-molybdenum steel frame, a model of lightness, flexibility and maneuverability, offers excellent stability and proves devilishly precise in turns. Thanks to its high torsional rigidity and low longitudinal rigidity, this frame allows better absorption of the energy generated by the front and rear suspensions when jumping or crossing a bump. Driving is more comfortable and less taxing. The brackets that provide the link between the cylinder head and the frame are now made of lightweight aluminum. Mounted laterally, they help to limit the level of vibration and to refine the trajectory of the motorcycle in the bends. Engineers can be proud of their work because the frame is now a kilo lighter than the lightest competitive frame available on the market today. Everything has also been done to facilitate maintenance and free up space for the tank and other components. The ultra-light rear part of the frame, made of stable aluminum profiles, weighs less than 900grams on the scale.
FOOTREST
Sophisticated ‘zero dirt’ footrests prevent clogging of the pivot, even when going through deep ruts. The driving position is not high enough? Never mind! The footrest mounting system of the KTM EXC models from AM 2018 has been raised by 6mm compared to that of the SX versions.
HANDLEBAR
When it comes to handlebars, KTM engineers have always known which direction to go. Contoured and made of high-strength aluminum, this handlebar is no exception to the rule. It is fitted with rubber shock absorbers and can be adjusted to two positions. The ODI handle is very practical to change if necessary, thanks to its mounting system without glue or wire.
SWINGING ARM
In addition to a significant weight saving, cast aluminum has an ideal bending behavior. The one-piece molding process eliminates the imperfections inherent in welding and guarantees a more consistent build quality, but also more careful.
PETROL TANK
The ultra-light polyethylene tank has a capacity of 7 liters. Tank cap with internal thread ensures easy and reliable closing.
WHEELS
Featuring ultralight CNC machined hubs and premium Excel rims, the wheels guarantee maximum stability despite limited unsprung weight. They are fitted with the latest generation Dunlop Geomax MX 3S tires.
SYSTÈCOOLING ME
KTM’s proven integrated cooling system circulates the coolant from the cylinder head through the frame wishbone to the aluminum radiators supplied by WP. Its incredible efficiency is due to the better management of the internal air flow and the progress made in ventilation thanks to CFD calculations (numerical simulation in fluid mechanics). The new radiator guards offer the advantage of better heat dissipation. This is all the more true in the presence of mud. Integrated into the front part of the spoilers, these radiator guards are particularly useful in the event of an impact.
FAIRING
All KTM factory riders have collaborated on the design of the bike with KTM R&D specialists and the Kiska design agency, with a single watchword: to create a perfect harmony between the rider and the machine. Particular attention has been paid to ergonomics and contact points to enhance freedom of movement on the SX. The particular shape of the front and rear mudguards guarantees maximum stability and minimum weight, thanks to a well-thought-out structure and assembly. Better yet: they stay clean longer.
GRAPHICS
Custom graphics kit, Factory orange frame: every detail counts, because in this discipline, there is nothing more beautiful than a racing car that stands out from the rest.
SHOCK ABSORBER
The WP shock absorber has been developed taking into account the architecture of the frame and the swingarm, just like the linkage system and the WP AER 48 fork. With its various machined and black anodized components, this ultra-sophisticated shock absorber is strong. impression compared to competing products less well finished. It benefits from a new setting that inspires confidence and optimized damping characteristics that go hand in hand with the setting of the front axle. And to show that you have good taste when it comes to suspensions, the shock features shiny colors, hallmarks of the WP brand..
FORK
Another interesting novelty on this bike is the WP AER 48 inverted fork with air spring and separate damping circuits, developed by WP in close collaboration with KTM. Damping functions are on the right, the air spring is on the left. The left fork leg has a dual chamber and air cartridge system to prevent pressure loss. Should the outer seal ever leak, the pressure exerted inside the inner cartridge will hold the motorcycle in position. The air spring is easily adjusted according to the weight of the pilot using a single valve. No special tools are required – the standard air fork pump will do. The right fork leg incorporates a cartridge specially designed to adapt to the type of damping sought. Simply turn the 30-screen dial to the desired position (compression up and rebound down) to choose the appropriate setting based on track conditions and rider preferences. More comfortable and more sensitive than ever, this fork (with revised damping characteristics) begs to be put to the test.
FORK TEE
High-quality CNC-machined triple trees, which ensure ultra-precise front end handling, have been a KTM hallmark for years. Two positions are possible for the handlebar trigger guard with shock absorber pads. The hour meter tells you when it’s time for a service.
BRAKES
These small technological gems are associated with Wave brake discs renowned for their lightness. More responsive, more efficient and more powerful than ever, Brembo brakes will tackle any situation.
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7600 €
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Replaces
125 SX 2017
Model marketed in
2012
2013
2014
2015
2016
2017
2018
2019
2020
The technical aspect
2018 KTM 125 SX
- Frame
- Frame: 25CrMo4 steel central tube frame
- Tank: 7 liters
- Seat height: 960 mm
- Wheelbase: 1,485 mm
- Weight in running order: 87.2 kg
- Train before
- WP inverted telehydraulic fork Ø 48 mm, deb: 310 mm
- 1 disc Ø 260 mm, 2 piston caliper
- Transmission
- 6-speed gearbox
- secondary by chain
- Rear axle
- WP mono-shock, deb: 300 mm
- 1 disc Ø 220 mm, 1 piston caliper
- Motor
- Single cylinder
in line
, 2 stroke - Cooling: by water
- Carburetor Ø 38 mm
-
124.80 cc
(54 x 54.5 mm) -
≈ 40
ch - Crit’air:
Detached pieces
exhaust
motor
fluid
electricity
filtration
braking
chain kit
Competitors
Yamaha YZ 125 2018
Gallery
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