Looking at the models that are included in the line-up of motocross bikes from KTM, you’d be remiss to wonder whether these guys are building one too many iterations.

That, of course, is the wrong way to look at things because if you’re a glass-half-full kind of guy, you know that more means, well, more choices. And that’s exactly what KTM has to offer.

One of the purest two-stroke bikes in the company’s line-up is the 250 SX. It offers a completely revamped frame made from high-quality chrome-molybdenum steel that’s both light and tough all at the same time. It is also characterized by a particularly balanced geometry that combines playful handling with razor-sharp precision. Just like the entire range of KTM bikes, the 250 SX is also now equipped with an elaborate linkage rear suspension system that raises the bar even higher for 250cc machines.

Apart from the new linkage rear suspension, the 250 SX also comes with a new cast aluminum swingarm, designed for minimum weight distribution while supplying optimum lateral stiffness and defined longitudinal flexibility. The results of all this is a bike that provides excellent tracking stability, playful handling, and extreme traction.

Moreover, the technology of a two-stroke engine that has been fitted into the 250 SX comes with indisputable advantages, including a high power/displacement and low weight that’s unrivaled in its class. The 250 SX’s flow-optimized intake flange between the airbox and carburetor now ensures even better charging with fresh gas, making for a bike that performs and handles like the best of them.

Find out more about the KTM 250 SX after the jump.

  • 2012 KTM 250 SX
  • Year:
  • Make:
  • Model:
  • Engine:
    Single cylinder, 2-stroke
  • Transmission:
    5 gear, claw shifted
  • Energy:
    Keihin PWK 36S AG
  • Displacement:
    249 L
  • Price:


2012 KTM 250 SX Exterior Drivetrain
- image 435100

The technology of a two-stroke engine has indisputable advantages, including the high power/displacement and low weight. In terms of power-to-weight ratio, the 250 SX is practically unbeatable. Unrivalled performance and playful handling are just two of its many strengths.

The 250 SX’s flow-optimised intake flange between airbox and carburettor now ensures even better charging with fresh gas. This results in even freer revving and even more power in all rev ranges for the liquid-cooled, two-stroke machine.

New Frame and Suspension

2012 KTM 250 SX High Resolution Exterior
- image 435106

The 250 SX’s completely revamped frame made from high-quality chrome-molybdenum steel is not only extremely light and torsion-resistant. It is also characterized by a particularly balanced geometry that combines playful handling with razor-sharp precision.

The two-strokes in the MX range from KTM are now also equipped with the elaborate linkage rear suspension system. Linking the shock absorber via a lever system provides high progressiveness and wide adjustment ranges. The 250 SX therefore has a season ticket for the podium, even on the most brutal motocross courses.


2012 KTM 250 SX Exterior
- image 435107

The 250 SX’s bodywork with the very slim seat and spoiler lines, plus excellent contact points, perfects the bike’s ergonomics, making handling even simpler and more precise.

Adjustable Control Exhaust and Adjustable Ignation Curve

2012 KTM 250 SX Exterior
- image 435093

The choice between two ignition curves, activated by means of a socket connector, and the adjustable TVC exhaust controller make it simple for the 250 SX rider to tune the performance characteristics of the two-stroke engine to his or her preference.


2012 KTM 250 SX High Resolution Exterior
- image 435109
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement 249 cm³ (15.19 cu in)
Bore 66.4 mm (2.614 in)
Stroke 72 mm (2.83 in)
Starting aid Kickstarter
Transmission 5 gear, claw shifted
Primary gear 26:72
Final drive 13:48
Clutch Wet multi-disc clutch / hydraulically operated
Ignition system Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
Frame Central tube frame made of chrome molybdenum steel tubing
Forks WP Suspension Up Side Down 4860 MXMA CC
Shock absorber WP Suspension 5018 BAVP DCC
Suspension travel Front 300 mm (11.81 in)
Suspension travel Rear 330 mm (12.99 in)
Brake system Disc brakes, brake calipers on floating bearings
Brake discs - diameter Front 260 mm (10.24 in)
Brake discs - diameter Rear 220 mm (8.66 in)
Chain 5/8 x 1/4"
Steering head angle 63.5°
Wheel base 1,495±10 mm (58.86±0.39 in)
Ground clearance (unloaded) 385 mm (15.16 in)
Seat height (unloaded) 992 mm (39.06 in)
Total fuel tank capacity approx. 7.5 l (1.98 US gal)
Unleaded premium fuel, mixed with 2-stroke engine oil (1:60)
Weight without fuel approx. 97 kg (214 lb.)


Dirt Rider----"The 250SX was just one of three KTM two-strokes we were fortunate enough to ride out at Cahuilla Creek the other day and I would have gladly taken any of them home, scratch that... all of them home. It is really hard for me to be disappointed in a new two-stroke nowadays, especially when that two-stroke is being developed along side the new four-strokes receiving the latest and greatest technology. KTM is making a statement by constantly developing their two-stroke line and it’s good to see that there is still a big enough market for them to do so."

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