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2025 KTM 125 SX

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MSRP: $8,199

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Specs and Features

ENGINE

Transmission

6-speed

Starter

Electric starter

Stroke

54.5 mm

Bore

54 mm

Clutch

Wet multi-disc DS clutch, Brembo hydraulics

Displacement

124.8 cm³

EMS

Vitesco Technologies EMS

Design

1-cylinder, 2-stroke engine

Fuel-mixture generation

Keihin EFI, throttle body 39 mm

CHASSIS

Weight (without fuel)

92.4 kg

Tank capacity (approx.)

7.2 l

Wheelbase

1493 mm

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm

Front brake

Disc brake

Rear brake

Disc brake

Chain

520, Non-sealed

Frame design

Central double-cradle-type 25CrMo4 steel

Front suspension

WP XACT-USD (AER), Ø 48 mm

Ground clearance

359 mm

Handlebar

Neken, aluminium Ø 28/22 mm

Rear suspension

WP XACT Monoshock with linkage

Seat height

958 mm

Silencer

Aluminium

Steering head angle

63.9 °

Rear subframe design

Aluminum-reinforced polyamide

Suspension travel (front)

310 mm

Suspension travel (rear)

300 mm

Wheels

Spoked wheels with aluminium rims

2025 KTM 125 SX

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 charging down a long straightaway. The 2025 KTM 125 SX takes its leads directly from the Factory Racing team and puts them to work like nothing else. Like the sound it makes, it cannot be beaten.

Electronic Fuel Injection

Pre-mix gets a remix across the 2-stroke KTM SX range, with Electronic Fuel Injection setting the standard. Now there's no more fiddly jetting setup pre-race, And thanks to the Keihin EFI and reed valve case design, you can be guaranteed of laying down optimal power at any altitude, all of the time.

Factory Performance Kit

Give your KTM 125 SX more bite with a 125 Factory Performance Kit. Comprising of upgraded engine parts, FMF exhaust, and special engine mapping, it provides a strong power increase across the rpm range.

Absolute Control

Get ready for a full-on berm assault. The 2025 KTM SX and SX-F machines have received major frame updates directly from Factory Racing efforts. For starters, the frame area around the rear shock mount has been updated and made more streamlined, with new engine mounts and cut-outs for improved chassis flex. The front area of the frame is also updated. with a different wall thickness than the previous model year, with renewed engine mounts. This adds up to a 300g weight saving and improved flex for better cornering.

Updated Suspension Settings

For 2025, the KTM SX and SX-F range has given the WP XACT AER fork and WP XACT rear shock an update. This means you'll be lining up at the starting gate with re-tuned settings, reduced weight, improved weight distribution, and an increase in overall response.

2025 KTM 125 SX

Specs and Features

2025 KTM 125 SX

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