The 2021 KTM 250 SX-F: The Fastest In Its Class, Now With A Four-Stroke

The 2021 KTM 250 SX-F is a true competitor, from the rawness of its power to the lightness of its frame. It’s been so successful as a two-stroke, that the European manufacturer put in the time and engineering to make a four-stroke version of the engine and bike for the 2021 model year, known as the 250 SX-F. The 250cc engine, like its 250 SX counterpart, makes just around 50 HP.

KTM has definitely done their homework, however, in separating the bikes between classes. The 250 SX-F four-stroke is more for the longer courses of supercross, and is able to participate in endurance rallies without much trouble. It can also go faster overall than the SX version, although it won’t get to its top speed quite as fast. The last key difference is that the SX-F has an electric starter, while the SX is kickstart only.

KTM Motorcycles kept the same chassis but with a few tweaks so that the bike can compete in several different forms of bike sport with the word “cross” as part of its name, be it motocross, supercross, or cross country. As with almost all KTM motocross bikes, it comes with WP racing suspension, disc brakes, and a 5-speed manual transmission with hydraulics by Brembo.

The 2021 KTM 250 SX-F starts at $9,299 USD / $10,599 CAD.

On this page: we’ve curated specs, features, news, photos/videos, etc. so you can read up on the new 2021 KTM 250 SX in one place.

2021 KTM 250 SX-F


Model Overview

General Info

  • Price: $9,299 USD / $10,599 CAD
  • Key Features:
    • 5-speed manual transmission
    • WP XAct racing suspension with AER tech included
    • Electric starter

Main Specs

  • Engine Type: 250cc four-stroke single
  • Horsepower: Approx 50 HP
  • Torque: Not provided by manufacturer
  • Wet Weight: 229 lbs (104 kg)
  • Seat Height: Not provided by manufacturer

2021 KTM 250 SX-F


2021 KTM 250 SX-F Specifications

From KTM

ENGINE

Engine 250cc, 1-cylinder, 4-stroke engine
Power Approx 50 HP
Bore x Stroke 78 mm x 52.3 mm
EMS Keihin EMS
Power in KW
Starter Electric starter
Lubrication

DRIVETRAIN

Clutch Wet multi-disc clutch, Brembo hydraulics
Transmission 5-Speed
Chain 5/8 x 1/4″

CHASSIS

Suspension Front WP XACT-USD, Ø 48 mm
Suspension Rear WP XACT Monoshock with linkage
Brakes Front 260 mm, Disc brake
Brakes Rear 220 mm, Disc brake
Suspension travel (front) 310 mm
Suspension travel (rear) 300 mm
Tank capacity (approx.) 7 l
Color Black, Orange

ELECTRICAL

Ignition
Spark Plugs
Headlight LED
Tail Light LED

DIMENSIONS

Overall Length
Overall Width
Overall Height
Wheelbase
Ground Clearance 370 mm
Seat Height 950 mm
Wet Weight 99 kg

WARRANTY

Warranty
Extension

2021 KTM 250 SX-F


2021 KTM 250 SX-F Features


2021 KTM 250 SX-F Photos


2021 KTM 250 SX-F Videos

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