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2020 KTM 125 SX

Chaparral Motorsports
April 30, 2019
Last Updated: October 6, 2020
2020 KTM 125 SX

The KTM 125 SX is the most compact and lightweight of the full-size bikes and delivers a confidence-inspiring ride like no other. A lightweight chassis teams up with the most competitive 125 cc 2-stroke engine in its class, delivering superior agility and power to fulfil the demands of any young adrenaline seeker. This 2-stroke screamer is the ultimate entry point into the pro ranks and a sure-fire way to add to the trophy collection.

2020 KTM 125 SX Highlights
NEW graphics for a READY TO RACE appearance.
NEW WP XACT front fork setting for improved damping, and new fork piston for improved performance. Features proven, sophisticated air spring design and separate damping functions.
NEW WP XACT rear shock setting and new compression adjuster for improved tuning.
NEW front sprocket fixation uses screw and diaphragm spring instead of circlip.
Reworked reeds for intake block offer improved function for better sealing and performance.
Reworked kickstart intermediate gear for improved durability.
High-tech, lightweight chrome-moly steel frame with optimized stiffness provides a great blend of comfort and stability.
Single-piece cast aluminum swingarm features a long rear axle slot for increased adjustability, offering better straight-line stability.
Lightweight die-cast engine cases feature a high crankshaft position located close to the center of gravity for optimal mass centralization.
38 mm flat slide carburetor provides smooth and controllable power delivery and guarantees optimal performance over the entire range.
Bodywork features a slim design for optimal comfort, control and freedom of movement.
Air box and air boot designed to provide maximum protection of the air filter against soiling and better airflow for optimal performance. Air filter can be accessed without tools for quick servicing.
Hydraulic Brembo clutch system offers light operation and highly controllable modulation of the clutch.
High-tech Brembo brakes have always been standard equipment on KTM offroad bikes and are combined with lightweight Wave discs.
Handlebar clamps feature a separated lower clamp and bridge-type upper clamp for more torsional stiffness.
KTM's "No Dirt" foot peg design keeps the peg pivot from becoming clogged, ensuring the foot peg is always in the correct position.
Super lightweight Galfer Wave rotors, CNC machined hubs, high-end Excel rims and Dunlop MX 3S tires.
"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 124.8 cc
Bore / Stroke 54 / 54.5 mm
Starter Kickstarter
Transmission 6 Gears
Fuel System Mikuni TMX 38
Lubrication Premix 40:1
Primary Ratio 23:73
Final Drive 13:50
Cooling Liquid Cooling
Clutch Wet Multi-Disc DS Clutch, Brembo Hydraulics
Ignition Kokusan
Frame Central Double-Cradle Type 25CrMo4 Steel
Sub Frame Aluminum
Handle bar Neken, Aluminum Ø 28/22 mm
Front Suspension WP XACT USD Fork, Ø 48 mm
Rear Suspension WP XACT Monoshock with Linkage
Suspension Travel Front/Rear 310 mm / 12.2 in; 300 mm / 11.81 in
Front/Rear Brakes Disc Brake 260 mm / 10.24 in; 220 mm / 8.66 in
Front/Rear Rims 1.60x 21" / 2.15 x 19" Excel
Front/Rear Tires 80/100-21" / 100/90-19" Dunlop MX 3S
Chain 5/8 x 1/4 in
Silencer Aluminum
Steering Head Angle 26.1º
Triple Clamp Offset 22 mm
Wheelbase 1,485 mm ± 10 mm / 58.5 ± 0.4 in
Ground Clearance 375 mm / 14.8 in
Seat Height 950 mm / 37.4 in
Tank Capacity Approx. 7.5 L / 1.98 gal
Weight (without fuel) Approx. 87.5 kg / 192.9 lbs
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