1 KTM 125 SX 2016

125 SX 2016: PURE EXCITEMENT

The high performing and well-proven KTM 125 SX has been on the market at the front of the

field for years. For MY 2016 this bike is even better. Powered by lighter and all-new high

performance 2-stroke engine, with a power valve and 6-speed gearbox fitted in a new state-

of-the-art chassis, the 125 SX remains a favorite among young champions. Once again this

lower capacity 2-stroke machine will set a new benchmark in the 125 cm³ class.

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ALL NEW ENGINE

CYLINDER

Within the heart of the new engine is a newly designed cylinder that has a bore of 54 mm. Apart from reworked ports, it features a newly developed power valve unit with a sophisticated mechanism for the lateral support exhaust ports. Together with a new two-component

cylinder head, this is the key for a massive performance increase over the entire range. Even though it is 360 g lighter and more compact than the previous model, the new layout of the water jackets in the

cylinder and head guarantee a better heat dissipation, which is important when the going gets tough.

DIE-CAST ENGINE CASES

For the latest engine generation the KTM engineers designed all new die-cast engine cases featuring a 27 mm higher clutch shaft and 37 mm higher crankshaft position, which has resulted in better mass

3 KTM 125 SX 2016

centralization for improved rideability. In addition, the engine body is much more compact and this contributes massively to the weight

reduction (600 g lighter).

PISTON

The new 125 SX piston is optimized for maximal reliability and the reworked shape fits perfectly to the new cylinder layout.

TRANSMISSION

A new 6-speed transmission provides the same gear ratios as the previous model, but due to the latest production technologies the

width could be reduced by 6 mm and the weight reduced by 200 g. An advanced "NO-DIRT" gear lever design prevents dirt from blocking the

joint of the lever guaranteeing safe activation of the transmission.

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EXHAUST

For the new model our engineers developed a new, specifically tuned exhaust pipe in order to get the maximum power output of the

engine.

NEW CRANK SHAFT

The new crankshaft provides the same stroke of 54.5 mm as in the past, but it features an optimized balancing for minimum vibration

while being 50 g lighter.

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ENGINE

The newly developed 125 cm³ engine for MY 2016 features a completely new architecture with the latest KTM engineering know-

how and the most advanced technology in the class. The result is that it produces better power all over the rev range, it is with 17.2 kg more than 2 kg lighter than the predecessor and it is much more

compact. The benefit for the rider will be reflected in faster lap times due to better rideability and higher performance.

CLUTCH

The new engine features a new hydraulic clutch mechanism made by Brembo instead of Magura. It ensures an easy clutch action and well-

defined modulation.

MASSIVE WEIGHT REDUCTION

AIRBOX

The new airbox design offers maximum protection of the air filter against soiling, while ensuring maximum airflow in conjunction with

new and 300 g lighter intake snorkels that are made of a new material (reducing the deformation due to air intake pulses) for improved

performance. As found on previous models, the new Twin Air filter is easier and safer to mount and can be changed without tools in

seconds, a standard, original feature by KTM.

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BATTERY AND WIRING HARNESS

As in the past, all new SX-F engines are fitted with the proven electric starter – a unique KTM feature and a major benefit at all levels of

motocross racing. For MY 2016 the SX-F range fits a super compact and lightweight 495 g lithium-ion starter battery into a standard

motocross bike, providing safe starting of the engine and reducing the weight by 1 kg over MY 2015!

BRAKES

High-tech Brembo brakes have always been standard equipment on KTM off-road bikes, and now are combined with newly designed and

weight-reduced Wave discs made by GALFER featuring improved heat resistance. Weight reduction is 63g on the front disc, and 32 g for the

rear. This is the ultimate solution in braking technology.

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SEAT

Ergonomically perfect, the new seat has a higher foam volume, which offers great comfort and durability, while weighing the same as the

previous model.

NEWLY DESIGNED CHASSIS

FRAME

The new frame design provides approximately 20 % higher torsional rigidity and 30 % less longitudinal stiffness, with newly designed engine stays for less vibration. This increased flexibility results in

better absorption of the energy created from the front and rear wheel loads supporting the suspension for more comfort and less rider

fatigue. A 0.4° steeper steering angle and a 10 mm shorter wheel base contribute to better handling and last but not least it´s around

380 g lighter than the previous model.

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HANDLEBAR

The new generation SX models are equipped with a new tapered handlebar made of high-strength aluminium by NEKEN, which is fixed in a new rubber damped handlebar clamp allowing the handlebar to

be mounted in two different positions.

FOOTPEG

A new sophisticated "No-Dirt" footpeg solution prevents dirt from blocking the pegs in order to bring them back into position, even

when digging in deep ruts. In addition the new footpegs are larger and more stable, provide better grip and they are also lighter than on

previous models.

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SWINGARM

As on the predecessor models, the new SX generation features a reworked cast aluminium swingarm. The updated design offers

reduced weight and an optimized flex behavior supporting the frame and suspension created with a single-component casting process. The

weight reduction is 250 grams.

BODYWORK

For the new generation of SX models the KTM factory riders were involved in shaping the bodywork together with the specialists from

KTM R&D and Kiska Design. The goal was to achieve complete harmony between rider and bike down to the finest details. The results are all-new plastics that provide perfect ergonomics and

contact points for the rider, maximum freedom of movement, a lower seat height of between 10 to 20 mm (rear end) and better comfort,

especially in the rear part of the seat.

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FUEL TANK

All models of the SX range have new lightweight polythene tanks with a capacity of 7.0 liters of petrol. The filler cap with an inside thread

makes for an easy and reliable closure. The 4-stroke models are fitted with an integrated fuel pump system.

GRAPHICS

New modern in-mold graphics highlight the sporty character of the MY 2016 SX range of cutting-edge Motocross bikes.

COOLING SYSTEM

The proven integrated KTM cooling system routes the coolant from the cylinder head through the frame triangle, directly to newly

developed aluminium radiators made by WP, which have a new filler cap system and are made of a stiffer alloy. Due to flow optimized internal circulation and CFD-calculated air ventilation, the cooling

efficiency has been improved by approximately 10 % and the sophisticated radiator guards provide efficient protection in case of

crashes.

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STATE-OF-THE-ART SUSPENSION

MONOSHOCK

The new generation of monoshock made by WP Suspension has been developed for the new SX models in conjunction with the new frame and swingarm architecture, including the reworked linkage system and the new WP forks. The linkage system has also been reworked with a revised geometry and longer pull rods, which was tested last

season in most of the KTM factory bikes.

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FORKS

The KTM SX models are fitted with a revolutionary new and super-lightweight WP fork, a 48 mm USD air-sprung fork developed by WP

Suspension in close collaboration with KTM. It is a split fork with separate functions for each fork leg. The damping functions are on the right side, whereas the air spring is in the left. The left leg features a capsuled air cartridge. This air spring is easy to adjust to any rider

weight via a single air valve and a standard fork air pump. The right fork leg integrates a completely new damping cartridge to fit single damping leg requirements, and the damping can be adjusted to the track conditions or the rider's preferences with a twist of a dial. The

new fork with approximately 300 mm travel has outstanding response and excellent, very consistent damping characteristics, while also with

a reduced weight of 1.4 kg compared to its predecessor.

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TRIPLE CLAMP

Top quality, CNC-machined triple clamps have been something of a KTM trademark for years. Ensuring a precise handling, they

perceptibly support the flex characteristics, and with it, the action of the forks. For MY 16 the upper triple clamp features a newly

developed rubber damping system for the handlebar clamp in order to reduce the vibration level of the handlebar. The clamps retain their

forward and back adjustability for any rider preference.

WEIGHT REDUCTION

The main target for the KTM engineers when developing the new SX generation was a massive weight reduction in conjunction with an

improved handling. The result of between 4 and 5 kg is outstanding making the new KTM models the lightest bikes in the competition, even though the 4-strokes are equipped with a super-beneficial

electric starter as a standard feature, while the competitor models need to be kickstarted.

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UNRIVALLED HANDLING

WHEELS

The 125 SX is fitted with lightweight, CNC-machined hubs, high-end Excel rims and new, weight reduced spokes with lightweight

aluminium nipples providing maximum stability at minimum weight. The latest MX tires from Dunlop (Geomax MX 32) have been

developed from KTM factory racing in the USA, factory testing and expert rider feedback in racing. They guarantee perfect traction and

outstanding performance.

BRAKES

High-tech Brembo brakes have always been standard equipment on KTM offroad bikes, and are combined with newly designed and weight-reduced Wave discs made by GALFER featuring also an

improved heat resistance. The ultimate solution in braking technology. Weight reduction front 63 g, rear 32 g.