2025 KTM 125 SX Bike

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Specifications

Product
KTM 125 SX Bike
Model Year
2025
Engine Size
125cc
Engine Type
Two-Stroke
Engine Displacement
124.8cc
Bore x Stroke
54 mm x 54.5 mm
Compression Ratio
 
Fuel System
Keihin Electronic Fuel Injection, 39 mm throttle body
Ignition
Vitesco Technologies EMS; electric starter, 12.8V 2 Ah lithium-ion battery under seat
Transmission
6-speed; wet multi-disc Diaphragm Steel (DS) clutch, Brembo hydraulics
Final Drive
Chain, 520, non-sealed
Suspension Front
WP XACT-USD AER, capsulated air spring, pressurized oil chamber for progressive/consistent damping, mid-valve damping system, air pressure preload valve, tool-free compression and rebound adjust, 48 mm diameter, 310 mm (12.2") travel
Suspension Rear
WP XACT Monoshock with linkage, coil spring, tool-free setup, high/low-speed compression adjust, 300 mm (11.81") travel
Brakes Front
Hydraulic disc, 260 mm rotor
Brakes Rear
Hydraulic disc, 220 mm rotor
Tires Front
Dunlop Geomax MX34
Tires Rear
Dunlop Geomax MX34
Overall Length
 
Overall Width
 
Overall Height
 
Seat Height
958 mm (37.7")
Wheelbase
1493 mm (58.8")
Ground Clearance
359 mm (14.1")
Rake/Trail
26.1° (63.9° head angle)
Fuel Capacity
7.2 liters (1.9 gallons)
Curb Weight
92.4 kg (203.7 lbs) without fuel
Features
• Updated and lighter frame with streamlined rear shock mount, new engine mounts, revised wall thicknesses, and cutouts for improved chassis flex
• Upgraded tank shrouds using bi-compound plastics channel air towards the radiators more efficiently and have a new fuel tank roll for a tighter, more secure fitment
• Revised fork and shock settings
• Improved frame/shock geometry provides more ground clearance at the linkage
• New linkage seals refine rear shock response and advanced damping characteristics
• Smaller diameter linkage bolts save weight
• Upgraded rear brake pedal adds additional stiffness and braking feel
• New chain guide and chain guard
• Updated one-piece air inlet sleeve and snorkel design
• Map select switch changes engine character depending on track conditions and rider preference:
— Map 1 (white) - linear, predictable power delivery, with a leaner air/fuel mixture, for hard-packed dirt
— Map 2 (green) - crisp, explosive power output, with a richer air/fuel mixture, for loose/thick/sandy conditions
Miscellaneous
• Engine: single cylinder, 2-stroke; reed valve case design; electronic power valve
• Exhaust: aluminum silencer
• Frame: central double-cradle-type hydro-formed laser-cut robot-welded 25CrMo4 steel, forged steering head connection; reinforced aluminum/polyamide subframe
• Handlebar: Neken, aluminum, 22/28mm diameter
• Rims: Excel, aluminum
• Triple clamps: CNC-milled
• Includes fork air pump
Price
$8,199.00
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