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Call us at 888-284-4588 or 541-928-3390 to see what kind of deal we can put together for you.
   MSRP prices do not include destination charge, pre-delivery set-up, state or local, title, registration, and license fees.
2017 KTM 125 SX  The whip cracking KTM 125 SX has been at the front for years. With the phenomenal performance on tap, it will be there for many more seasons to come. A compact chassis and the lowest weight out there is teamed up with a high performance 125cc 2-stroke engine for a surefire trophy collection. Get shredding, youngsters.

Technical Specs

Features and Benefits

Bodywork  KTM R and D, Kiska Design and the factory racers had their say in shaping the plastics with one goal: complete harmony between rider and bike. Perfect ergonomics and contact points provide maximum comfort in movement on the SX-F. The I-beam structures of the front and rear fenders guarantee maximum stability and a low weight thanks to well thought-out construction and mounting. They also stay cleaner for longer.
 
Graphics  New graphics convey the READY TO RACE character of the 2017 SX-F model line.
 
87.2 KG 
 
Airbox  The airbox design offers maximum protection of the air filter while ensuring maximum airflow. The large twin-air filter is mounted in a stiff cage, which at the same time holds the system in place. This design is so simple you could still pop a fresh one in with a face full of mud. Without tools. In seconds.
 
Frame  The high-tech, lightweight chrome-moly steel frame is engineered for excellent handling, precise cornering and supreme stability. You can also count on high torsional rigidity and low longitudinal stiffness for better absorption of the energy created by the front and rear suspension sucking up jumps and bumps. In short: more comfort and less rider fatigue. Laterally attached, lightweight engine head stays contribute to a reduced vibration level. The engineers were able to pull off all that, while making the frame two pounds lighter than that of the lightest competitor on the market. In addition, the frame is easier to maintain, easier to work on and supplies more space for the tank and other components. The bike also features an extra-light aluminum subframe, which weighs in at less than 2 pounds.
 
Footpegs  Sophisticated "No Dirt" footpegs prevent clogging of the footpeg pivot, even when digging in deep ruts. Looking for a higher riding position? Then just mount the footpegs of the MY2017 EXC models, which are 6mm higher than the SX versions.
 
Handlebar  KTM engineers sure know how to handle handlebars. This tapered one, made of high-strength aluminum by NEKEN, is fixed in damped rubber mounts and has two different positions. From 2017 onwards, the lower handlebar clamps are separated, while on the upper side a new bridge-type clamp guarantees more torsional stiffness. Itís also easier to replace the bar in case it gets twisted in a nasty crash. ODI lock-on grips make grip changes easy which does not require any wire or glue to be secured.
 
Swingarm  The cast aluminum design offers low weight and a perfect flex behavior. The single-component casting process eliminates any inconsistencies and inherent weak points created by welding. Itís better looking as well.
 
Fuel Tank  A lightweight polyethylene tank has a capacity of 1.85 gallons. The filler cap has an inside thread, which makes for easy and reliable closure.
 
Seat  ailored to meet the needs of the worldís fastest racers, this durable seat offers great comfort. For 2017, a new cover gives its riders even more grip with better feel.
 
Wheels  Featuring lightweight, CNC machined hubs and high-end Excel rims, they guarantee maximum stability and minimal unsprung weight. The wheels are shod with the latest Dunlop Geomax MX 3S tires.
 
Cooling System  KTMís proven cooling system routes the coolant from the cylinder head through the frame triangle, directly to aluminum radiators made by WP. A new filler cap system and are stiffer alloy construction increase the durability and reliability of the cooling system. Due to flow optimized internal circulation and CFD-calculated air ventilation, the system is superbly efficient. In addition, well thought-out radiator guards integrated in the front part of the shrouds provide protection in a crash.
 
Engine  The latest 125 SX engine is the most powerful and most competitive engine in its class; a clear statement that KTM is keen on keeping 2-stroke technology at the forefront of development. The secret to their success is an outstanding power-to-weight ratio, low costs and simplicity. This 125cc ripper has been developed with the latest KTM engineering know-how and the most advanced technology available. The results: class-leading power across the rev range, while being extremely compact and ultra-light at a mere 38 pounds. Our work here is done; now itís up to you to collect the trophies.
 
Cylinder  This compact cylinder with a 54mm bore features a cutting-edge power valve unit with a sophisticated mechanism for the lateral support exhaust ports. Matched to a twin-component cylinder head, it is KTMís secret to all-round grunt. The layout of the water jackets in the cylinder and head guarantees efficient heat dissipation when the going gets tough.
 
Engine Cases  For the latest engine generation the KTM engineers designed lightweight die-cast engine cases featuring a high crankshaft position located close to the center of gravity, which results in optimal mass centralization and outstanding rideability. In addition, the engine is extremely compact while still able to house an optional electric starter.
 
Crankshaft  This reliable piece of engineering has been skillfully balanced to guarantee minimal vibrations. In its latest form, it allows an increase of the displacement to 144cc just by replacing cylinder, piston and head. Thereís no longer the need to change the crankshaft if you want to change displacement. Two-in-one in no time.
 
Transmission  A robust 6-speed transmission was designed specifically for the small 2-stroke engine, its gear ratios are perfectly in sync with the 125ís power band. The latest production technologies allow for compact dimensions and minimal weight. An advanced "No Dirt" gear lever design prevents mud from clogging the folding tip for reliable shifts even in the worst conditions.
 
Carburetor  As of model year 2017, all KTM 2-stroke models are fitted with new MIKUNI TMX carburetors, replacing the Keihin products. This 38mm flat slide carb lives to provide smooth and controllable power all the way up to the limit. And itís less sensitive to different altitudes and temperatures, so you can pin it wherever, whenever.
 
Exhaust  The engineers meticulously tuned the expansion chamber for maximum torque and power, so this screamer is as tough as it is strong.
 
Monoshock  The WP monoshock has been developed with the entire frame and swingarm architecture in mind, including the linkage system and the WP AER 48 front forks. It features machined and black anodized components and is a valuable, high-end product compared to roughcast reservoirs. A new setting and a softer spring perfectly match the reworked front-end set-up and its sparkling WP color scheme lets everyone know you have excellent taste in suspension.
 
Forks  The lightweight WP AER 48 front fork, a 48mm USD air-sprung fork developed by WP in close collaboration with KTM, is a split fork with separate functions for each leg. That means damping functions are on the right side, whereas the air spring is in the left. This left leg features a two-chamber system with a capsuled air cartridge to prevent loss of air pressure. The air spring is easy to adjust to any rider weight via a single air valve. No special tools are required; just the air pump provided with the bike. The right fork leg integrates a damping cartridge that tailors to all your damping needs. It can be adjusted to the track conditions and the riderís preferences with a twist of a dial (compression from the top, rebound from the bottom, 30 clicks each). For 2017, the AER 48 also features redesigned outer tubes with better flex characteristics, smoother operation and less friction. And they are 3 pounds lighter than the 4CS units they replace. Right off the dealer floor, these forks are more comfortable and more sensitive than ever. But you can still hammer the hell out of them.
 
Triple Clamp  Top quality, CNC machined triple clamps have been a KTM trademark for years to ensure precise handling. For 2017, the upper triple clamp specifically features a redesign in conjunction with the new fork tubes. The rubber damped handlebar mount has also been reworked and the lower handlebar clamps are now separated, while on the upper side a new bridge-type clamp guarantees more torsional stiffness and can easily be replaced in case it gets twisted due to a crash. In addition, an hour meter is fitted at the upper triple clamp in order to let the rider know itís time for a service.
 
Brakes  You canít brake any harder, better, faster or stronger. These high-tech Brembo babies are combined with lightweight wave discs made by Galfer. For 2017, the rear brake features a 10mm longer brake pedal and you get new, less aggressive brake pads all round.
 
 
 

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