Both models feature redesigned frames, new WP XACT closed-cartridge spring forks, revised shock absorbers, updated ergonomics and new engine management systems, with development drawing on feedback from KTM’s MXGP and AMA SuperMotocross racing programmes.
The 2027 Factory Editions also provide the first look at the technical platform that will be introduced across KTM’s broader SX motocross range for 2028.
NEW 250 SX-F ENGINE REVS TO 14,500RPM
The biggest engine changes are found on the 250 SX-F Factory Edition, which receives a substantially redesigned powerplant with a higher compression ratio and increased rev limit.
Compression has been raised to 15.5:1, while the rev ceiling now reaches 14,500rpm, matching the engine speeds used by KTM’s factory racers in MXGP and AMA SuperMotocross.
The revised engine features an oval throttle body, oval intake ports, top-feed fuel injection and a completely redesigned valvetrain, with KTM targeting increased performance throughout the rev range.
The engine has also been repositioned 2.3mm higher in the frame to improve mass centralisation and chassis behaviour under acceleration.
KTM has not released a peak horsepower figure for the new 250 SX-F Factory Edition, although the manufacturer claims the engine represents a significant increase in performance over the previous generation.
450 SX-F PRODUCES 63.8HP
The 450 SX-F Factory Edition also receives engine updates, with KTM claiming a peak output of 63.8hp at 10,000rpm and 52Nm of torque at 7000rpm.
The revised engine incorporates changes to its intake, exhaust and fuel management systems, with the aim of improving throttle response and making the additional performance more manageable on the track.
Both models feature new exhaust systems and revised engine packaging, along with updated cooling systems and redesigned airboxes.
KTM has also revised the gearboxes to reduce weight, improve durability and deliver smoother shifting.
A new Engine Management System uses an updated ECU with faster sensor processing and revised control algorithms to manage ignition timing, fuel delivery and gear-dependent mapping.
The changes are also designed to improve Quickshifter operation, particularly under racing conditions.
NEW FRAMES AND CLOSED-CARTRIDGE SPRING FORKS
Both Factory Editions receive completely revised frames with changes to geometry, stiffness, engine mounting points and steering head design.
KTM says the new chassis reduces weight and improves rider feedback, with revised frame construction intended to provide greater stability and agility across different track conditions.
The aluminium subframe has also been redesigned and is claimed to be the lightest produced by KTM to date.
Further changes include a revised CNC-machined triple clamp and an adjustable wheelbase arrangement that allows the rear wheel to be positioned farther back.
One of the most significant suspension developments is the introduction of a new WP XACT closed-cartridge spring fork, replacing the previous front suspension design.
The fork has been developed alongside a revised WP XACT rear shock, with KTM targeting more consistent damping, improved front-end feedback and greater control over repeated impacts.
The closed-cartridge design is intended to maintain damping performance under demanding race conditions, particularly when the suspension is subjected to repeated heavy landings and braking bumps.
KTM has also revised the suspension settings and chassis stiffness to work with the new fork and shock package.
SLIMMER BODYWORK AND REVISED RIDER POSITION
The 2027 Factory Editions feature redesigned ergonomics, including slimmer bodywork, a revised seat and changes to the footpeg surfaces.
KTM has increased the contact area between the rider’s legs and the motorcycle, with the aim of improving grip and control when standing or moving around the bike.
The new seat and bodywork have also been developed to make it easier for riders to shift their weight forwards and backwards through corners and over jumps.
Lighter NEKEN handlebars are fitted, with two mounting positions available to adjust the cockpit layout.
FACTORY COMPONENTS AND IMPROVED SERVICEABILITY
Both Factory Editions are fitted with a range of race-focused components, including WP PRO COMPONENTS CNC-machined triple clamps and a Factory Start Device.
Brembo braking components are retained, with a revised rear brake pad designed to provide smoother braking performance.
The bikes also feature EXCEL wheels with a new spoke arrangement, ODI lock-on grips and a Selle Dalla Valle seat cover.
KTM has made several changes intended to simplify servicing, including a more accessible hour meter and revised component positioning.
Maintenance information is also etched onto various components to make routine workshop work easier.
The redesigned airbox, cooling system and exhaust have been developed with both performance and serviceability in mind.
NEW PLATFORM FOR 2028 KTM SX RANGE
The 2027 Factory Editions represent a major technical change for KTM, with the new engines, frames and suspension systems set to form the foundation of its 2028 production motocross models.
The move to WP XACT closed-cartridge spring forks is particularly significant, while the 250 SX-F’s 15.5:1 compression ratio and 14,500rpm rev limit point to a substantial engine development programme.
The 450 SX-F’s claimed 63.8hp output also puts a clear figure on KTM’s latest engine revisions, although independent testing will be needed to determine how that translates to performance on the track.
Both models have been developed with input from KTM’s international race teams, with the manufacturer using its Factory Editions to introduce the next generation of production motocross technology.
The 2027 KTM 250 SX-F Factory Edition and 450 SX-F Factory Edition will be available in limited numbers through authorised KTM dealerships in Australia and New Zealand from February 2027.
Australian pricing and production numbers have not yet been announced.
