2027 KTM 300 SX - K37729

2027 KTM 300 SX 

IT'S HUNTING SEASON

When it comes to power-to-weight ratios, the KTM 300 SX writes the rule book. Now with learnings taken directly from the KTM Factory Racing teams, and a care package labeled ""Go get 'em!"", the KTM 300 SX is engineered for one task alone - to lead from the front.

Before The Gate

LESS FOCUS ON THE TOOL, MORE FOCUS ON THE TRACK

Serviceability

The KTM SX and SX-F range is engineered and designed to provide riders with easy-to-access service parts, as well as suspension adjustability. This permits faster trackside and off-season maintenance, as well as simplifying motocross for novice riders without pit crews. For 2026, a new threaded radiator cap allows easier and faster opening with reduced force.

CLICK INTO ACTION

Easy Suspension Adjustment

As always, the suspension boasts an easy tool-free setup at both ends, ensuring you chase down the podium in total control. On the rear, a hand-adjustable dual compression option allows riders to adjust high- and low-speed settings in a matter of seconds. The forks on the front end are also easily modified thanks to hand-adjustable clickers on the bottom of the fork shoe and top cap.

NO JETS - ONLY ROCKET SHIPS

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 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. For 2026 there is a new fuel protector cap: you'll still have quick and easy access for maintencance but now more safety against any outside damage and accidental opening as well as preventing dirt from entering the sides of the connector.

CHUGGA CHUGGA, RING DING DING!

Electric Start

Picture this; You're 7 laps into an absolute ripper of a race. You miss your line and end up stalling in a deep rut. But don't sweat it. All you do is press the starter button and you blast off again to take the flag. This is the reality on the KTM SX models. Thanks to a 12,8V 2 Ah lithium ion battery is placed under the rider's seat, a high-quality starter & pickup and super robust design, the only thing you'll be kicking - is ass.

Start Strong

PICK YOUR POWER

Selectable Maps

The KTM SX models features a map select switch allowing the racer to switch between 2 engine maps. Map 1 provides a linear, predictable power delivery, while Map 2 gives it the full beans with crisp, explosive power output.

SMOOTHER POWER DELIVERY

EFI + Power Valve

With EFI comes great rideability. Along with the electronic fuel injection and a power valve on the KTM SX models, allowing for more usable power throughout the rev range. Smoother power means better traction. Better traction means holeshot heaven!

UNMATCHED PERFORMANCE

Performance

The 300 cc 2-stroke powerhouse brings a only choice of weapon into the MX Open category and provides more choice for racers looking for maximum power at the least possible weight. Along with low maintenance costs, an overall engine mass of just %":& LB (23,9 kg), the KTM 300 SX provides pure performance. And then some.

PICK YOUR POWER

Selectable Maps

The KTM SX models features a map select switch allowing the racer to switch between 2 engine maps. Map 1 provides a linear, predictable power delivery, while Map 2 gives it the full beans with crisp, explosive power output.

Calm Under Fire

FLUID RIDER MOTION

Ergonomics

Tank shrouds using bi-compound plastics channel air towards the radiators more efficiently, while a concise fuel tank roll, makes for a tighter, more secure fitment, reducing the chance of frame scrubbing and dramatically improving durability. All this works alongside the specially-developed rider triangle, to provide unmatched knee contact and gripping surfaces - especially when standing on the pegs.

SLEEKER FOR YOU TO SCRUB CLEANER

Absolute Control

Get ready for a full-on berm assault. The KTM SX and SX-F machines feature revised frame updates developed with input from KTM Factory Racing. For starters, the area around the rear shock mount is streamlined, with optimized engine mounts and cut-outs for improved chassis flex. The front area of the frame features optimized wall thickness with updated engine mounts.

Hit The Big Stuff

DIGGING THE DIRT

Tires

Getting power hooked into the dirt is a tough job. However, hours of research and testing have led the KTM Motocross range to the Dunlop GEOMAX MX34. Providing unmatched stability and control at the highest level, the rubber features a rigid carcass and rubber compound that improves damping and absorption, maintaining performance up to 30% longer than previous models. Progressive Cornering Block Technology also improves grip in the berms, while the rear pattern has a tall and wide center block for desirable traction and control everywhere else. Lastly, this unique block arrangement works to dispel mud buildup, ensuring traction in even the muddiest of track conditions.

UNFLAPPABLE FRONT END

WP XACT Fork

Let's get the technical parts out of the way first; the 48 mm WP XACT AER forks fitted to the KTM SX and SX-F line-up features a capsulated air spring and pressurized oil chamber for progressive and consistent damping, while oil and air bypasses reduce pressure peaks. In combination with the mid-valve damping system, all this provides exceptional feedback and rider comfort. The fork also has settings which not only compliment the frame and rear linkage, but ensures stellar performance at all levels. Speaking of settings, these are easily adjusted via a single air pressure pre-load valve, as well as easy-access click adjusters for compression and rebound. Additionally, the WP air pump needed to adjust the fork's air pressure is provided as standard in the buy-pack.

TRACK SMOOTHER

WP XACT SHOCK

Keeping things in check at the rear, the WP XACT rear shock uses settings directly from the KTM Factory Racing Teams. The frame and shock geometry provide increased ground clearance at the linkage, reducing the risk of bottoming out. Small-diameter linkage bolts save weight, while refined linkage seals improve rear shock response and advanced damping characteristics. Proper setup is advised for optimal performance.

RACING ON RAILS

Stability

The KTM Motocross range has a special rear brake pedal adding additional stiffness, bending resistance and braking feel to the overall package. At the other end, a forged steering head connection and CNC-milled triple clamps, make for the perfect alignment of the fork tubes. This precise geometry of the fork clamps ensures highly responsive and smooth fork action - not to mention unwavering stability when charging across ruts and onto the podium.

Maintaining Momentum

PRECISE, LAP AFTER LAP

Consistency

Count on a durable chain guide and chain guard and minimize the chances of hooking on external objects - especially in extremely muddy terrain while reducing dirt build-up around the swingarm and rear sprocket. For 2027 we've also modified the fixing points and routing of the wiring harness so it's less prone to wear and damage.

UNOBTRUSIVE IMPACT

Energy absorption

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. The fuel protector cap delivers easy maintenance access combined with improved protection against impact, accidental opening, and dirt ingress at the connector sides.

NOTHING TO HOLD YOU BACK

Ground clearance

The shock absorber geometry on the KTM SX and SX-F machines gives decent ground clearance for the linkage, with the topology-optimized die-cast footpegs being less susceptible to hooking on deep ruts, and take-offs when scrubbing.

Harnessing Gravity

Mass Centralization

With a strong focus on mass centralization, KTM SX and KTM SX-F engines are designed to concentrate rotating mass at the core, working in perfect harmony with the chassis. The result is lighter, more agile handling that runs rings around the competition.