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KTM 2022 125 SX Dirt Bike Review Specs

The KTM 125 SX is the smallest and lightest full-size KTM motocross bike in the lineup, bringing championship-winning performance to up-and-coming riders. The KTM 2022 125 SX has become the most competitive 125cc 2-Stroke engine in its class, thanks to its confidence-inspiring performance, lightweight chassis, and overall agility. This 2-Stroke screamer is the best entry point into the professional ranks for 2022, as well as a sure-fire method to add to the trophy collection.

KTM 2022 125 SX Dirt Bike

KTM 2022 125 SX Dirt Bike – Features and Specs

Engine & Exhaust

When it comes to more excellent power delivery and performance, the new exhaust system designed exclusively for this motorcycle plays a vital role and delivers a powerful punch. Furthermore, its attractive design allows for smaller ergonomics while functioning safely within racing noise limitations.


The KTM 125 SX engine is unquestionably the most competitive and robust in its class. With their excellent power-to-weight ratio, cheap cost, and general simplicity, 2-strokes will have a bright future at KTM. The 37.9-pound engine was designed with the latest KTM engineering expertise, resulting in broad power over the rpm band. Its simple rideability and excellent performance translate to faster lap times and more significant results.


A modified 54 mm bore cylinder lies at the heart of the 125 cc engine. It has a sophisticated mechanism for the lateral support exhaust ports, as well as an improved power valve unit. The new exhaust port layout improves engine performance, and the upper contour of the exhaust port has been machined for better port timing. The newly reworked cylinder, along with the two-component cylinder head, is crucial to the KTM 125 SX’s outstanding performance across the rev range.

Crankcases and engine covers

The lightweight engine cases are made using a high-pressure die-casting process that reduces wall thickness while maintaining strength and durability. The design enables a high crankshaft position near the center of gravity, resulting in optimal mass centralization and improved rideability. The engine body is tiny, which significantly adds to the engine’s low weight. In addition, the kickstart intermediate gear has been redesigned for 2020 to increase dependability.

KTM 2022 125 SX Dirt Bike


A 6-speed gearbox is standard on the KTM 125 SX. The gear ratios were approved over from the predecessor, with modifications and enhancements. A redesigned drive shaft with a screw for front sprocket attachment and a diaphragm spring instead of a circlip ensures reliable pinion fixation in the gearbox. The “no-dirt” gear shifter is another hallmark of the 125 SX gearbox. It eliminates dirt build-up and guarantees that the next gear is always available, regardless of the conditions, similar to the footpeg design.


The MIKUNI TMX 38 mm flat slide carburetor on the KTM 125 SX has settings that were changed to suit the new airbox created in 2019. Reworked intake reed block reeds for 2020 give even more function, sealing, and dependability, ensuring that the entire system delivers smooth, regulated power across the rev range.


A CDI control unit with sophisticated hardware is standard on all 2-stroke versions, enhancing the engine’s starting characteristics. The ignition curves stay the same.


Maintaining the proper engine temperature is essential for consistent horsepower throughout the journey. The radiators on the KTM 125 SX have been redesigned and are positioned 12 mm lower than on previous models. It lowers the center of gravity and precisely fits the shape of the redesigned shrouds for optimal ergonomics. The revolutionary system provides the ideal engine temperature for the best performance, regardless of the conditions, by combining CFD technology with efficient coolant circuit routing. The radiators also include specific guards that function as a brace that disperses energy around the radiators in the case of an accident, as well as protection against flying rocks and debris.

KTM 2022 125 SX Dirt Bike



The KTM 125 SX’s airbox guarantees outstanding flow dynamics, which, when combined with the intake snorkels, results in peak power and rapid throttle response. Despite the apparent performance benefits, the design also gives the best protection against air filter contamination. The massive Twin-Air air filter is set on a sturdy cage that is smartly engineered to prevent incorrect installation. Filter maintenance is quick and uncomplicated and requires no tools, like on prior versions – a classic, original KTM feature.


The KTM 125 SX’s frame and subframe are designed to accommodate the extreme riding styles associated with 125 cc racing. The frame is made of hydroformed chromium-molybdenum steel tubes that are robot welded to ensure consistent quality. The stiffness has been fine-tuned for the most dynamic handling, and it works in perfect tandem with the suspension to give ultimate agility without sacrificing high-speed stability. The frame also has “no dirt” footpegs with a simple but efficient self-cleaning technology that ensures the footpegs return to their original position, offering you perfect control in any weather. SX frames have the same high-durability powder coating as KTM Factory motorcycles and have standard frame protectors. The lightweight aluminum subframe provides rear fender stability and robust support for the rider with minimal additional weight.


The one-piece swingarm utilizes a gravity die-cast manufacturing method for maximum strength and minimal weight. It has a broad range of rear-wheel adjustment, allowing for a shorter wheelbase on tighter, twistier tracks or a larger wheelbase on longer, more choppy courses for increased stability. The chain measurement lines on the swingarm are visible from above, making adjustment more accessible and more precise.

KTM 2022 125 SX Dirt Bike


On all SX models, KTM employs lightweight, CNC-machined hubs and high-end Excel rims to ensure optimum stability and minimal weight. The aluminum spoke nipples have a handy design that lowers the frequency with which the spokes must be tightened. The newest DUNLOP GEOMAX MX 3S tires are mounted to the wheels, providing maximum grip and stability while transmitting all power to the ground.

Front suspension

The super-lightweight WP XACT front fork with AER technology is standard on all full-size KTM SX models. It’s a 48 mm USD air-sprung fork with damping functions on the right side and an air spring on the left. A two-chamber arrangement with a capsuled air cartridge on the left leg helps reduce air pressure loss. It implies that even if the exterior seal leaks, the internal cartridge pressure retains the bike in a normal position. The air spring is elementary and can be adjusted to any rider’s weight with a single air valve and the included air pump. The right fork leg has a damping cartridge that may be changed to the track conditions and the rider’s preferences to match single damping leg needs. In addition, the fork top caps feature a redesigned shape that allows for more effortless adjustment.

Rear suspension

The WP XACT DDC (Dynamic damping control) monoshock is standard on all KTM SX models, and it was designed to function as a single unit with the frame and swingarm design, as well as the linkage system and the WP XACT fork. It has high-quality machined and anodized components that lend a touch of sophistication and make it appealing beyond merely being practical. It’s completely adjustable, including high and low-speed compression, so you can fine-tune it to fit any track and rider’s tastes.

Triple clamp

KTM’s triple clamps, which have become a KTM hallmark, are standard on all SX models. To match the flex features of the frame and fork, the triple clamp has a carefully calculated stiffness and offset (22mm offset for all models). The result is a front end that operates in perfect harmony and contributes to overall handling and stability. Vibration is reduced by the rubber damped handlebar fixing, allowing for some flexibility with two distinct mounting positions. All SX versions come complete with an hour meter mounted on the triple upper clamp, which keeps the rider aware of the number of hours spent tearing up the track and when the next servicing is needed.


All KTM motocross bikes have always had high-tech BREMBO brakes as standard equipment. The acclaimed system, when combined with lightweight wave discs, gives the best level of braking efficiency, allowing you to out-brake the competitors.

Fuel tank

The lightweight polyethylene fuel tanks are standard on all KTM SX models. The gasoline tank’s form allows for sleek ergonomics while maintaining the 1.98-gallon capacity. The internal thread on the filler cap provides for simple and dependable sealing.

Ergonomics & Comfort


Even while digging in deep ruts, sophisticated ‘no-dirt’ footpegs avoid clogging the footpeg pivot. Do you want to enjoy the ride at a higher position? Then just install the 2019 EXC footpegs, which are 6 mm taller than the SX variants.


The seats on all KTM SX models complement the range’s dynamic performance-oriented ergonomics. The silicone stripes on the seat cover provide the rider with a more sumptuous feel and grip. The seat is secured to the motorcycle with a single long, lateral screw, making it safe and easy to use.


The same NEKEN high-strength aluminum tapered handlebar is used on all full-size KTM SX models. The handlebar is held at two distinct positions by rubber-dampened mountings. On the right side, an ODI vulcanized grip is standard, while on the left, a comfortable ODI lock-on grip that requires no wire or adhesive is standard. They also have a bar-pad with a cover that can be easily attached and removed.

KTM 2022 125 SX Dirt Bike

Bodywork & Graphics


The new modern graphics have a rapid and aggressive appearance that conveys the competition.

KTM 2022 125 SX Dirt Bike – Price

The new KTM 2022 125 SX Dirt Motorcycle is available at $7,499 only.

KTM 2022 125 SX Dirt Bike – Technical Specifications


Transmission 6-speed
Starter Kickstarter
Stroke 54.5 mm
Bore 54 mm
Clutch Wet multi-disc DS clutch, Brembo hydraulics
Displacement 124.8 cm³
EMS Kokusan
Design 1-cylinder, 2-stroke engine


Weight (Without Fuel) 87.5 kg
Tank Capacity (Approx.) 7.5 l
Front Brake Disc Diameter 260 mm
Rear Brake Disc Diameter 220 mm
Front Brake Disc brake
Rear Brake Disc brake
Chain 5/8 x 1/4″
Frame Design Central double-cradle-type 25CrMo4 steel
Front Suspension WP XACT-USD, Ø 48 mm
Ground Clearance 375 mm
Rear Suspension WP XACT Monoshock with linkage
Seat Height 950 mm
Steering Head Angle 63.9 °
Suspension Travel (Front) 310 mm
Suspension Travel (Rear) 300 mm


The KTM 2022 125 SX Dirt Bike is the smallest and lightest full-size KTM motocross bike in the lineup, bringing championship-winning performance to up-and-coming riders. The KTM 2022 125 SX has become the most competitive 125 cc 2-Stroke engine due to its confidence-inspiring performance, lightweight chassis, and overall agility.

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