
FULL-SCREAM AHEAD
2027 KTM Motocross
MY27 KTM 125 SX
FULL-SCREAM AHEAD
- •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.
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Highly rated by our customers for service, expertise, and reliability.
Tech Specs
ENGINE TECHNICAL DATA
Engine
Engine Type
Single cylinder, 2-stroke
Displacement
124.8 ccm
Bore / Stroke
54 / 54.5 mm
Compression Ratio
—
Starter / Battery
Electric starter / Lithium Ion 12.8V 2Ah
Cooling
Liquid cooling
Fuel System
Keihin EFI, throttle body 39 mm
Ignition / Engine Management
Vitesco Technologies EMS
Control
Electronic Exhaust Control
Lubrication
Mixture oil lubrication 1:40
Transmission
Gears
6
Clutch
Wet multi-disc DS-clutch, Brembo hydraulics
Gear Ratios
| Gear | Ratio |
|---|---|
| 1st | 14:32 |
| 2nd | 15:30 |
| 3rd | 17:28 |
| 4th | 19:27 |
| 5th | 19:23 |
| 6th | 22:24 |
Primary Ratio
23:73
Final Drive
13:50
Chain
520, Non-sealed
Chassis
Frame
Central double-cradle-type 25CrMo4
Subframe
Aluminium reinforced Polyamide
Handlebar
Neken, Aluminium Ø 28 / 22 mm
Steering Head Angle
63.9°
Triple Clamp Offset
22 mm
Silencer
Aluminium
Suspension
Front Suspension
WP XACT-USD (AER), Ø 48 mm
Rear Suspension
WP XACT Monoshock with linkage
Suspension Travel Front / Rear
310 / 300 mm
Wheels, Tyres & Brakes
Front / Rear Rims
1.60 × 21" / 2.15 × 19" — Excel
Front / Rear Tyres
80/100-21" / 100/90-19" — Dunlop MX34
Front / Rear Brakes
Disc brake Ø 260 / 220 mm — Brembo
Dimensions & Weight
Wheelbase
1,493 mm ± 10 mm
Ground Clearance
359 mm
Seat Height
958 mm
Tank Capacity (approx.)
7.2 L
Weight (without fuel)
92.0 kg
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