2015 KTM 125 SX

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Built to get you out of trouble even on the toughest tracks, the KTM 125 SX is the perfect machine for junior racers who are looking for a reliable and potent dirt bike.

Propelled by a high performance 1 - cylinder, 2 - stroke, water cooled engine with exhaust control system and 6-speed transmission, the 125 SX is without a doubt one of the most capable dirt bikes in its class.

The KTM 125 SX sits on lightweight wheels which feature black coated, high-end Excel rims with lightweight, CNC-machined hubs and spokes with lightweight aluminium nipples. The wheels are kept in check by a front WP Suspension up side down 4860 MXMA CC fork and a rear WP Suspension 5018 BAVP DCC shock absorber.

The motorcycle’s backbone is represented by a modern frame design made of lightweight, high strength, chrome-molybdenum steel section tubes.

Hit the jump for more information on the KTM 125 SX.

Overview

KTM 125 SX

KTM 125 SX 2015: In a Class of Its Own

The 125 SX has long since established itself as the undisputed top dog above all in junior race series and as a springboard to the professional leagues. Powered by a high-performance 2-stroke engine with exhaust control system and 6-speed transmission, the 125 SX has been further improved for the 2015 model year, ensuring it will maintain its popularity with young champions in future.

2015 KTM 125 SX Key Features:

KTM 125 SX

Unrivalled Handling:

Wheels
The wheels fitted for MY 2015 feature black coated, high-end Excel rims with lightweight, CNC-machined hubs and spokes with lightweight aluminium nipples, allowing highest levels of stability to be achieved, while keeping weight to a minimum. New Dunlop Geomax MX 52 tyres were developed in collaboration with the KTM USA factory team and offer perfect traction with top performance. The new rear sprockets save 50 grams in unsprung mass.

Brakes
High-tech brakes from Brembo have always been standard equipment on KTM offroad bikes and, together with the lightweight wave brake discs, they are the measure of all things in terms of brake technology. As the best brakes in the motocross class, they remain unchanged for MY 2015.

Top Ergonomics:

KTM 125 SX

Bodywork
KTM engineers have focussed on designing the bodywork ergonomically and functionally in such a way that the whole motorcycle is in perfect harmony with the rider down to the very last detail. The front fender is a perfect example of how moulded plastic components can gain maximum stability with a well thought out structure and well-conceived attachment.

Graphics
A new, refined graphic design with clear lines underlines the high demands made of a modern, state-of-the-art offroad motorcycle.

Seat
The ergonomically perfectly designed seat is equipped with a durable foam core, ensuring both generous comfort and high stability.

Airbox
At the same time, the design of the airbox guarantees optimum protection of the air filter from dirt plus maximum air throughput for the highest performance. Quick replacement of the twin-air filter - without tools and in a matter of seconds - has long since been an unrivalled KTM standard.

Fuel Tank
All models in the SX range are equipped with a 7.5 litre, lightweight polyethylene fuel tank. The fuel pump system used on the 4-stroke motocross models is the same as that used on the 4-stroke enduro models, thereby allowing optional fitting of larger tanks from the PowerParts range or from the enduro models.

Handlebar
All SX models are equipped with the extremely sturdy, tapered Renthal Fatbar 827 handlebar that features an offset specially designed to meet the demands of motocross. In accordance with the proven KTM standard, the handlebar can be fixed in a choice of four positions. For MY 2015, it is equipped with softer two-component grips to spare the rider’s hands.

Engine:

KTM 125 SX

The engine on the 125 SX 2015 has been upgraded with an optimised ignition curve in order to achieve more effective combustion for better power development and optimum rideability.

Superior Chassis:

KTM 125 SX

Frame
The modern frame design of the SX models, comprising lightweight, high strength, chrome-molybdenum steel section tubes, combines maximum longitudinal stiffness with optimum torsional stiffness. A forged and milled cross-tube connects the two frame halves with the connecting rod of the linkage on the new SX frame for 2015. Omission of the weld seams leads to very precise manufacturing tolerances and greater safety - moreover, it saves another 60 grams of weight.

Linkage / Shock Absorber
The revamped damping system for MY 2015 features a new linkage with optimised geometry. The flatter progression with a higher initial rate ensures greater stability and lowers the rear end. In addition, the new design saves another 40 grams of weight. The fully adjustable WP 5018 shock absorber has been completely retuned to suit the new linkage.

Fork
The fully adjustable upside-down fork from WP Suspension has been perfectly tuned to the new rear wheel damping system and the new 22 mm front axle (formerly 26 mm) for MY 2015. The new axle provides a better feel for the front wheel and also saves a further 40 grams. The new fork stubs now feature an offset of 33 mm instead of 35 mm, which together with increased trail deliver greater ride stability. Furthermore, they accommodate newly developed, 50 gram lighter fork protectors.

Triple Clamps
High quality, CNC-machined triple clamps have long since been standard equipment at KTM. They ensure precise handling and provide a perceptible boost to the flexing characteristics and hence the responsiveness of the telescopic fork. The new O-ring carrier for the lower steering head bearing, a revised shaft tube and the new steering head bolt save another 40 grams.

Specifications

Engine1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement124.8 cm³
Bore54 mm
Stroke54.5 mm
Starting aidKick starter
Transmission6 gear, claw shifted
Primary ratio23:73
Final drive13:50
ClutchWet multi-disc clutch / Brembo hydraulics
Ignition systemContactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
FrameCentral tube frame made of chrome molybdenum steel tubing
ForksWP Suspension Up Side Down 4860 MXMA CC
Shock absorberWP Suspension 5018 BAVP DCC
Suspension travel Front300 mm
Suspension travel Rear317 mm
Brake systemDisc brakes, brake calipers on floating bearings
Brake discs - diameter Front260 mm
Brake discs - diameter Rear220 mm
Chain520 X-ring
Steering head angle63.5°
Wheel base1,480±10 mm
Ground clearance (unloaded)395 mm
Seat height (unloaded)992 mm
Total fuel tank capacity approx.7.5 l Unleaded premium fuel (98 octane), mixed with 2-stroke engine oil (1:40)
Weight without fuel approx.90.4 kg

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