2014 KTM 125 SX

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The 2014 KTM 125 SX has all it needs to reward you with a thrilling riding experience. The motorcycle is built using top-notch components so it is reliable to the core.

Power comes from a 1 cylinder, 2 stroke, water-cooled engine with reed intake and exhaust control. The unit has been improved with a redesigned reed valve housing Boyesen performance reeds. The engine transfers its power to the rear wheel through a six speed transmission with multidisc clutch.

The bike’s stopping power is assured by a set of high-tech Brembo disc brakes that are offered as standard equipment. It is also worthy of being mentioned that the 2014 model year comes with a newly developed handbrake armature with new remote reservoir, smaller brake piston diameter and new levers with optimised lever kinematics. Moreover the motorcycle is fitted with a new, lightweight, polyethylene, 7.5 litre fuel tank.

Hit the jump for more information on the 2014 KTM 125 SX.


KTM 125 SX

In a class of its own

Top-quality, CNC-machined triple clamps have been something of a KTM trademark. Ensuring a precise handling, they perceptibly support the flex characteristics, and with it, the fork’s action.


KTM 125 SX

The wheels feature CNC-machined hubs, high-end Excel rims and black coated spokes with lightweight aluminium nipples, allowing the highest levels of stability to be achieved while keeping weight to a minimum. The fitted Pirelli Scorpion MX Mid Soft 32 tyres excel with perfect traction and outstanding performance.


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. A newly developed handbrake armature has been employed for the 2014 model year, with new remote reservoir, smaller brake piston diameter and new levers with optimised lever kinematics. As a result and thanks to optimised brake pads, performance and application of the front brake have been perceptibly improved again.


KTM 125 SX

The engine on the 125 SX 2014 has been improved with a redesigned reed valve housing featuring Boyesen performance reeds and now boasts even better responsiveness. The carburettor setting has been adjusted and the piston grinding pattern optimised for greater durability.


KTM 125 SX

The cast aluminium swingarm has been developed with state-of-the-art calculation and simulation software and constructed, in terms of design and wall thickness, for minimum weight with optimum stiffness and precisely defined flexibility. For the 2014 model year, our engineers have revised the chainguide and its attachment points to the swingarm for the benefit of higher functional reliability, while simultaneously reducing the weight.

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.


KTM 125 SX

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. It guarantees easy handling and precise steering behaviour, as well as excellent ride stability.


Both the rear shock absorber and the 48 mm upside-down fork from WP Suspension guarantee ultimate damping and responsiveness. Thanks to optimised tuning, the telescopic fork excels with even higher reserves against bottoming out in MY 2014. Naturally, rebound and compression damping can be adapted individually to the track and rider in no time at all – while high and low-speed compression damping can also be adjusted on the rear shock absorber.


KTM 125 SX

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. A large Renthal crash pad, still in classy black/silver for 2014, provides the rider with effective impact protection.


KTM 125 SX

The ergonomically perfectly designed seat is equipped with an improved foam core for the 2014 model year, ensuring both greater comfort and higher stability.

Fuel tank:

All models in the SX range are equipped with a new, lightweight, polyethylene, 7.5 litre fuel tank, which has been revised in the area of the filler cap internal thread and can be closed even more easily and reliably with a new filler cap. The fuel pump system used on the four-stroke motocross models is the same as that used on the four-stroke enduro models, thereby allowing optional installation of larger tanks from the PowerParts range or from the enduro models.


KTM 125 SX

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


KTM 125 SX

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.

Air box:

KTM 125 SX

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.


Engine type1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement124.8 cm³ (7.616 cu in)
Bore54 mm (2.13 in)
Stroke54.5 mm (2.146 in)
Starting aidKick starter
Gearbox6-gear, claw shifted
Primary transmission23:73
Secondary ratio13:50
ClutchMultidisc clutch in oil bath/hydraulically activated
IgnitionContactless controlled fully electronic ignition with digital ignition adjustment, type Kokusan
FrameCentral tube frame made of chrome molybdenum steel tubing
ForkWP Suspension Up Side Down 4860 MXMA CC
Shock absorberWP Suspension 5018 BAVP DCC
Suspension travel Front300 mm (11.81 in)
Suspension travel Rear317 mm (12.48 in)
Brake systemDisc brakes, brake calipers on floating bearings
Brake discs - diameter Front260 mm (10.24 in)
Brake discs - diameter Rear220 mm (8.66 in)
Chain5/8 x 1/4"
Steering head angle63.5°
Wheelbase1,480±10 mm (58.27±0.39 in)
Ground clearance unloaded395 mm (15.55 in)
Seat height unloaded992 mm (39.06 in)
Total fuel tank capacity, approx.7.5 l (1.98 US gal) Super unleaded gasoline (98 octane), mixed with 2-stroke engine oil (1:40)
Weight without fuel, approx.90.8 kg (200.2 lb.)


The KTM 125 SX is certainly not a speed demon, but despite its diminutive engine it still has enough punch to offer a fun ride. The handling is top notch and you shouldn’t have any complains about the suspensions either. And as far as built quality is concerned, the KTM 125 SX is without a doubt one of the best built looking bikes in its class.

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