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2018 KTM 125 SX Dirt Bike Review Specs Pics

The new 2018 KTM 125 SX Dirt Bike is one of the incredible off-roaders for those who were waiting for the 2018 Models of KTM. This bike has the high-performing engine with the best bore to stroke ratio. The 125cc 2-stroke engine is optimized for best performance in all conditions. The compact chassis and the low weight frame contains an awesome graphics with an ultimate design. The review of new 2018 KTM 125 SX Dirt Bike with its specification and pictures are written below.

2018 KTM 125 SX Dirt Bike – Specification and Pictures

2018 KTM 125 SX Dirt Bike

Small Bore, Big Power

The new 2018 KTM 125 SX Dirt Bike comes with the powerful and most competitive engine. The use of 2-stroke technology provides the best performance in all conditions. It features an outstanding power to weight ratio with low costs and simplicity. This engine is carefully developed with the latest KTM engineering know-how with the most advanced technology. This results in the class-leading power across the rev range while it is extremely compact and ultralight due to its 17.2 kg. The compact cylinder features the bore of 54mm with the cutting-edge power valve with the sophisticated mechanism for best exhaust ports. The use of twin-component cylinder head ensures the best performance. The layout of water jackets in the cylinder and head guarantees efficient heat dissipation.

2018 KTM 125 SX Dirt Bike Engine

The engineers of KTM has designed the lightweight die-cast crankcases containing the crankshaft position located close to the center of gravity. It results in optimal mass centralization and outstanding rideability. The crankshaft is very skillfully balanced to guarantee minimal vibration. It allows an increase in the displacement to 144cc just by replacing the cylinder, piston, and head. So, there is no need to change the crankshaft two-in-one in no time. The new 6-speed transmission is specially designed for the 2-stroke engine. It’s gear ratios are perfectly synced with its 125’s power band. The latest technologies allowed the compact dimensions and minimal weight. The new MIKUNI TMX carburetor uses 38mm flat slide carb, which provides the smooth and controllable power. This carburetor is being turned about seven-degree to reduce the overflow of fuel. It is less sensitive to different altitudes and temperature. The engine is extremely responsive like the older 2017 KTM 125 SX Dirt Bike. The exhaust system is perfectly tuned for maximum torque and power. The new CDI control unit with an advanced hardware is being used to improve the starting behavior of the engine.

2018 KTM 125 SX Dirt Bike Engine

Sleek & Slick

The new 2018 KTM 125 SX Dirt Bike comes with the stylish chassis. The engineers have made it slimmest and lightest dirt bike because it represents one of the Best Dirt Bike Brand. The high-tech and lightweight chrome-moly steel frame are used for an easy handling, precise cornering, and excellent stability. It provides the high torsional rigidity and low longitudinal stiffness. This modification results in better absorption of energy created from the rear and front suspension. It ensures more comfort and less rider fatigue. The engine head is laterally attached are made of lightweight aluminum. They provide precise cornering and minimum vibration level. The engineers were the success in making this chassis a kilogram lighter than other. Moreover, it is easier to maintain and provides more space for a fuel tank. This bike features the light sub-frame made by stable aluminum profiles. The new foot pegs prevent the clogging of footpeg pivot. If the rider wants higher riding position, he can easily achieve it by mounting the foot pegs of MY18 KTM EXC models. These models have 6mm higher foot pegs position than SX versions. The air filter box is specially designed to protect the air filter against soiling plus it ensures the maximum airflow. The large Twin Air filter is mounted to the stiff cage. The design of this system is very simple and rider can easily pop a fresh air filter in without any use of tools. The lightweight polyethylene tank features the fuel capacity of 7 liters. The lightweight CNC machined hubs and the high-end Excel rims ensure the maximum stability and minimum unsprung weight. The wheels are shod with the latest Dunlop Geomax MX 3S tires. The new handlebars are made with the high-strength aluminum. They are fixed in damped rubber mounts and can be adjusted in two different positions. The ODI lock-on grips make grip changes easy and it does not require any wire or glue to be secured. The new cooling system routes the cylinder head through the frame triangle directly to the aluminum radiator made by WP. Due to the use of optimized internal circulation and CFD-calculated ventilation, this system is very efficient. The new radiator protections enhance the heat dissipations.

2018 KTM 125 SX Dirt Bike

Looks That Matter

The new 2018 KTM 125 SX Dirt Bike features the R&D, KISKA design with for better look. The primary objective behind was to establish the complete harmony between rider and bike. The perfect ergonomics and contact points offer the maximum comfort in movement on the SX. The new I-beam structures of the front and rear fenders ensure the maximum stability and low weight. It stays cleaner for the longest time. The frame has kept orange graphics like many other KTM bikes have.

2018 KTM 125 SX Dirt Bike

Rider Can Handle It

The all-new 2018 KTM 125 SX Dirt Bike features the new WP shock absorber for the smooth ride. These shock absorbers have been designed for this frame, including the linkage and the WP AER 48 front fork. It contains the black anodized components, high-end product compared to the rough cast reservoirs. The confidence inspiring setting with improved damping characteristics matches the frontend setup. The sparkling WP color scheme is used to match with the frame. The lightweight WP AER 48 front fork and the 48mm USD air-sprung fork is especially developed in close collaboration with the KTM. It is split fork with the separate function for each leg. The damping function is kept on the right side while the air spring is kept on left. The left leg contains the 2-chamber system with the capsule air cartridge to prevent any low of air pressure. The internal cartridge pressure with maintains the bike’s position if the outer seal starts to leak. The air spring is easy to adjust to the rider weight via a single air valve. The fork air pump supplied with the bike performs well. The right fork leg integrates the damping cartridge and it can be adjusted according to track condition and riders preference. This fork is the very comfortable and sensitive as compared to others. The new CNC machined triple clamps ensure an accurate handling. The rubber damped handlebar fixation allows for two positions and an hour meter is fitted in order to let the rider know the time for service. The high-tech Brembo contains the lightweight Wave brake discs. The braking system ensures the harder, better, faster and stronger braking force.

2018 KTM 125 SX Dirt Bike – Specs

2018 KTM 125 SX Dirt Bike Specs


2018 KTM 125 SX Dirt Bike Specs

Design 1-cylinder, 2-stroke engine
Displacement 124.8 cm³
Bore 54 mm
Stroke 54.5 mm
Starter Kickstarter
Transmission 6-speed
Primary drive 23:73
Secondary gear ratio 13:50
Clutch Wet multi-disc clutch, Brembo hydraulics
EMS Kokusan


2018 KTM 125 SX Dirt Bike Specs

Frame design 25CrMo4 steel central-tube frame
Front suspension WP-USD, AER 48, Ø 48 mm
Rear suspension WP shock absorber with linkage
Suspension travel (front) 310 mm
Suspension travel (rear) 300 mm
Front brake Disc brake
Rear brake Disc brake
Front brake disc diameter 260 mm
Rear brake disc diameter 220 mm
Chain 5/8 x 1/4″
Steering head angle 63.9 °
Wheelbase 1485 ± 10 mm
Ground clearance 375 mm
Seat height 960 mm
Tank capacity (approx.) 7 liters
Weight READY TO RACE (without fuel) 87.2 kg

2018 KTM 125 SX Dirt Bike


This article is about the review of new 2018 KTM 125 SX Dirt Bike and shows that it is one of the best dirt bikes by KTM. It comes with the quality components giving the best performance in all conditions. The engine provides an ultimate performance and gives the massive amount of torque and acceleration. This new dirt bike is only for champs and only champs deserve it.

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