There are very few sounds that can’t be beaten: the crack of a soda can on a blistering hot day, the ping of the perfectly executed golf shot, and the scream of a 125 cc 2-stroke full throttle. The KTM 125 SX takes its leads directly from the KTM Factory Racing team for pure performance, pure results. Like the sound it makes, you won’t forget it.

Design 1-cylinder, 2-stroke engine
Displacement 124.8 cm³
Transmission 6-speed
Fuel-mixture generation Keihin EFI, throttle body 39 mm
EMS Vitesco Technologies EMS
Clutch primary drive teeth 73
Primary drive 23:73
Clutch Wet multi-disc DS clutch, Brembo hydraulics
Clutch type DS multi-disc wet clutch
Clutch operation Brembo hydraulics
Engine cylinder Single cylinder
Engine stroke 2-Stroke

Frame design Central double-cradle-type 25CrMo4 steel
Front brake Disc brake
Rear brake Disc brake
Rear subframe designAluminum-reinforced polyamide
Chain 520, Non-sealed

Front suspension WP XACT-USD (AER), Ø 48 mm
Rear suspension WP XACT Monoshock with linkage
Suspension travel (front) 310 mm
Suspension travel (rear) 300 mm
Front suspension adjustment Compression (high and low speed), rebound
Rear suspension setting Compression and rebound adjustable

Seat height 958 mm
Ground clearance 359 mm
Tank capacity (approx.) 7.2 l
Weight (without fuel) 92 kg