Motorcycle specifications KTM150 SX 2017 Muscle sec

With the KTM 150 SX, the fun is endless. As nimble as a 125 and almost as muscular as a 250 cm3 4-stroke engine, this bike offers incredible energy for its weight. With its impressive power and torque and cutting-edge chassis, it's one step ahead of the competition. This two-stroke has what it takes to race ahead.

eNGINE

the 150 SX's engine combines unique know-how with cutting-edge technologies, delivering great power across the entire rev range.bursting with energy, it is undoubtedly one of the most compact and lightest 150 cm3 engines in its segment. Precise and maneuverable, this bike will deliver excellent lap times. The 150 incorporates most of the key components of the 125 SX, the leader in its class. The cylinder, cylinder head and piston can now also be mounted on a 125 cm3 engine base to convert it into a 150 SX without replacing the crankshaft. One for the price of two. Or almost.

cYLINDER

this ultra-compact cylinder, with a bore of 58 mm, features avant-garde exhaust control and a sophisticated mechanism for the side support exhaust channels. Combined with the two-piece cylinder head, this design is responsible for a clear increase in power across the range. The layout of the water jackets inside the cylinder and cylinder head ensures efficient heat dissipation under high engine loads.

mOTOR CARTER

for the latest generation of engines, KTM engineers have designed ultra-light molded crankcases. The position of the crankshaft has also been raised to bring it closer to the center of gravity, thus centralizing mass and enhancing rideability. Despite its extremely compact form, the engine can accommodate an optional electric starter.

cARBURER

starting with AM 2017, all KTM 2-stroke models will be equipped with the new MIKUNI TMX carburetor instead of the usual Keihin carburetor. This 38-mm flat-barrel carburetor offers a clear improvement in power delivery over the entire operating range. It is also less sensitive to changes in altitude and temperature.

vILEBREQUIN

a model of reliability, the engine has been carefully balanced to minimize vibrations. Thanks to the replacement of the cylinder, piston and cylinder head, displacement is now 144 cm3. As the crankshaft remains the same, the engineers killed two birds with one stone.

gEARBOX

another interesting innovation designed specifically for the 2-stroke engine is a robust 6-speed gearbox perfectly suited to the 125's range of use. The reduction in weight and size of the engine was made possible by the use of ultra-modern production technologies. As safety is also an essential parameter, the selector adopts a new "zero dirt" design that prevents the lever joint from jamming due to dirt. Because even greasy terrain enthusiasts take a dim view of mud when it gets lodged in the wrong places.

eXHAUST

the combustion chamber has been carefully designed to deliver even more power and torque. This engine is a marvel of explosiveness and solidity.

fRAME

the high-tech chromium-molybdenum steel frame is a model of lightness, flexibility and maneuverability, offering excellent stability and diabolical precision when cornering. Thanks to its high torsional stiffness and low longitudinal rigidity, this frame absorbs the energy generated by the front and rear suspensions when jumping or going over a bump. The ride is more comfortable and less tiring. The dropouts that link the cylinder head to the frame are as light as ever. Side-mounted, they also help to limit vibration levels and refine the bike's trajectory in bends. The engineers can be proud of their work, as the frame is now one kilo lighter than the lightest competing frame on the market today. Every effort has also been made to facilitate maintenance and free up space for the fuel tank and other components. The ultra-light rear section, made of stable aluminum profiles, weighs in at less than 900 grams.

fOOTREST

sophisticated "zero-dirt" footrests prevent the gear selector from getting dirty, even when riding in deep ruts.

aIR FILTER HOUSING

the air filter housing protects the air filter from clogging and ensures optimum air flow. The cage housing the extra-large Twin Air air filter is totally rigid, making it easier to hold the system in place. The design is so simple that you could replace the filter even with your face covered in mud. And without the need for any tools. And in a matter of seconds.

oSCILLANT ARM

as well as saving weight, cast aluminium is ideal for bending. The one-piece casting process eliminates the imperfections inherent in welding, guaranteeing not only more homogeneous, but also more meticulous manufacturing quality.

fUEL TANK

the ultra-light polyethylene fuel tank has a capacity of 7 liters. The internally threaded fuel cap ensures easy, reliable closure.

hANDLEBARS

when it comes to handlebars, KTM engineers have always known which way to go. This NEKEN handlebar, with its high-strength aluminum profile, is no exception. It features rubber silent-blocks and can be adjusted to two positions. starting with AM 2017, the handlebar is secured by two clamps (lower part) and a new trigger guard (upper part) that improves torsional rigidity. It's also easier to replace the handlebars should they become bent after a nasty fall. right: an ODI vulcanized handle; left: the ODI lock-on handle, as comfortable as it is practical, thanks to its glueless, wire-free mounting system.

sADDLE

tailored to provide a comfortable support surface, this saddle is as durable as it is comfortable. For added pampering, riders will benefit from a new saddle cover on the AM 2017, designed to enhance grip and feel.

cOOLING SYSTEM

kTM's proven integrated cooling system circulates coolant from the cylinder head via the frame triangle to aluminum radiators supplied by WP. Its incredible efficiency is due to improved management of internal airflow and advances in ventilation thanks to CFD (Computational Fluid Dynamics) calculations. The well-thought-out radiator guards integrated into the front spoilers are particularly useful in the event of an impact. For KTM, every detail counts.

wHEELS

featuring ultra-light CNC-machined hubs and top-of-the-range Excel rims, the wheels guarantee maximum stability despite limited unsprung weight. They are fitted with the latest-generation Dunlop Geomax MX 3S tires.

fORK

another interesting new feature 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. The damping functions are on the right, the air spring on the left. The left fork leg features a double-chamber air cartridge system to prevent any loss of pressure. Should the outer seal leak, the pressure exerted inside the inner cartridge will hold the bike in position. The air spring is easily adjusted to the rider's weight using a single valve. No special tools are required: the standard pump will do the trick. The right-hand fork leg incorporates a cartridge specially designed to adapt to the type of damping required. Simply turn the 30-notch knob to the desired position (compression up and rebound down) to select the appropriate setting according to track conditions and rider preference. For AM 2017, it's also important to point out that the outer tubes of the AER 48 fork have been redesigned to optimize bending characteristics, provide more flexibility and limit friction forces. They have also lost 265 g, which is far from insignificant. More comfortable and sensitive than ever, these forks are ready to be put through their paces.

fORK TIPS

high-quality CNC-machined fork crowns have been a KTM trademark for years. Enabling precise steering, they significantly enhance the flexibility characteristics and, thus, the action of the fork. For AM 2017, the design of the upper fork crown has been revised to accommodate the new plungers. The handlebars, fitted with rubber silent-blocks, are secured by two clamps (lower part) and a new trigger guard (upper part) that improves torsional rigidity. Handlebar replacement is also easier, for example in the event of a fall. An hour meter on the upper fork crown indicates when it's time for maintenance or refuelling.

dAMPER

the WP shock absorber was developed with the new frame and swingarm architecture in mind, as were the linkage system and the WP AER 48 front fork. With its various machined and black-anodized components, this ultra-sophisticated shock absorber makes a strong impression compared to less well finished competing products. It features a new setting and a softer spring to match the new front-end setting.

bRAKES

more responsive, more efficient and more powerful than ever, Brembo brakes are ready to face any situation. These little jewels of technology are combined with Galfer Wave discs, renowned for their lightness. For AM 2017, the rear brake pedal has been lengthened by 10 mm and the new brake pads are now less aggressive.

cARENAGE

kTM factory riders collaborated on the bike's design with KTM R&D specialists and the Kiska design agency, with a single watchword: to create perfect harmony between rider and machine. Ergonomics and contact points for the rider have been carefully designed for maximum freedom of movement. The lowered saddle offers superior comfort, especially at the rear. The special shape of the front and rear mudguards is a perfect example of intelligent design: thanks to a well-thought-out structure and assembly, these mudguards guarantee maximum stability, while being lighter at the same time. Best of all, they stay clean longer.

Information and images: KTM