KTM Press Release Below:

The new 250 SX features a newly developed two-stroke engine fitted in a state-of-the-art chassis. Designed with the entire know-how of the KTM R&D and motorsport department the new generation SX with its class-leading performance is faster with less vibration than any 250cc two-stroke before. The unrivaled performance of the lightweight 2-stroke engine makes it a true contender against the more complex 4-strokes. An all-new chassis features a chromoly steel frame with high torsional rigidity with less longitudinal stiffness for excellent handling and bump absorption. Matched with WP AER 48 air-sprung forks and new rear shock, the 2017 KTM 250 SX is the most READY TO RACE 2-stroke ever created. This masterpiece of KTM’s R&D and motorsport departments is born to lead the next pack of winners that prefer premix.

2017 250 SX Highlights

  • NEW 249cc engine features an all new architecture with a new shaft arrangement for better mass centralization.
  • NEW cylinder with twin-valve controlled power valve for smooth power that can be adjusted within seconds for different track conditions.
  • NEW lateral counter balancer reduces engine vibrations for less rider fatigue at the end of the moto.
  • NEW reworked 5-speed transmission shifts easier with more precision.
  • Hydraulically operated DDS clutch features a damping system for better traction and durability.
  • NEW 38mm Mikuni TX carburetor for smoother and more controllable power delivery. It is also less sensitive to altitude and temperature changes.
  • NEW lightweight Chromoly steel frame provides high torsional rigidity with less longitudinal stiffness resulting in excellent handling and energy absorption.
  • NEW Tuned exhaust pipe for maximum power output.
  • NEW WP AER 48 front fork with a sophisticated air spring design and separate damping for easy adjustment to any track condition, rider weight or skill level. The fork is now 3.1 pounds lighter than the 4CS unit it replaces.
  • NEW rear suspension settings and softer rear spring are perfectly matched to the WP AER 48 front fork.
  • NEW top triple clamp supports the new flex characteristic of the WP AER 48 fork for better action and reduced friction.
  • NEW Handlebar clamps feature a separated lower clamp and bridge-type upper clamp for more torsional stiffness.
  • NEW 10mm longer rear brake pedal and less aggressive brake pads provide better modulation and control.
  • KTM’s “No Dirt” footpeg design keeps the pegs pivot from becoming clogged, ensuring the footpeg is always in the correct position.
  • Super lightweight Galfer Wave rotors, CNC machined hubs, high-end Excel rims and Dunlop GEOMAX MX3S tires.
  • Airbox and filter design provides maximum performance with fast “no tools” air filter changes.
  • “No Dirt” shift lever prevents dirt from fouling the lever joint to ensure proper shifting in any condition.


  • Engine Type: Single Cylinder 2-Stroke
  • Displacement: 249cc
  • Bore/Stroke: 66.4/72.0mm
  • Starter: Kickstarter
  • Transmission: 5 Gears
  • Fuel System: Mikuni TX 38 Carburetor
  • Lubrication: Premix 60:1
  • Primary Ratio: 26:72
  • Final Drive: 13:48
  • Cooling: Liquid Cooling
  • Clutch: Wet Multi-Disc DDS-Clutch, Brembo Hydraulics
  • Ignition: Kokusan
  • Frame: Central Double-Cradle Type 25CrMo4 Steel
  • Subframe: Aluminum
  • Handlebar: Neken, Aluminum Ø 28/22mm
  • Front Suspension: WP Suspension AER 48 USD Ø 48mm
  • Rear Suspension: WP Monoshock 5018 BAVP DCC with Linkage
  • Suspension Travel Front/Rear: 300mm/11.81in; 300mm/11.81in
  • Front/Rear Brakes: Disc Brake 260mm/10.24in; 220mm/8.66in
  • Front/Rear Rims: 1.60 x 21”, 2.15 x 19” Excel
  • Front/Rear Tires: 80/100-21”; 110/90-19” Dunlop MX3S
  • Chain: 5/8 x 1/4 in
  • Silencer: Aluminum
  • Steering Head Angle: 26.1º
  • Triple Clamp Offset: 22mm
  • Wheelbase: 1,485mm ± 10mm/58.5 ± 0.4in
  • Ground Clearance: 370mm/14.6in
  • Seat Height: 960mm/37.8in
  • Tank Capacity, Approx: 7L/1.85gal
  • Weight (without fuel), Approx: 95.4kg/210.3lbs
First Look: 2017 KTM Motocross and Cross-Country Line

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