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KTM 50 SX
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KTM 50 SX

The KTM 50 SX is a serious, race-ready youth motocross bike designed for young riders aged roughly 4 to 10. With true READY-TO-RACE DNA, it brings full-size MX performance into a miniature, adjustable package built to grow as confidence and skill develop.

Performance & Power The heart of the 50 SX is a race-bred 49 cc two-stroke single-cylinder engine that delivers around 5.5 hp in a compact and responsive unit. The engine is liquid-cooled and tuned with a Dell’Orto carburettor and centrifugal multi-disc clutch, ensuring smooth, narrow-powerband acceleration without the need for a manual gearbox—perfect for budding racers. Its high-revving character delivers thrilling bursts of power with precise clutch feel that suits competitive riding.
Control & Comfort Built on a lightweight chrome-moly steel frame, the 50 SX features both adjustable handlebar position and left-foot pegs to match growing riders. The front end is governed by a 35 mm WP XACT USD fork with around 200 mm travel, matched by a fully adjustable WP XACT rear shock with approximately 190 mm travel—offering plush yet responsive suspension. Hydraulic disc brakes front and rear deliver confident and controllable stopping power, while a low seat height and slim ergonomics encourage proper rider stance and easy handling.
Versatility & Style Styled like its full-size KTM counterparts, the 50 SX carries bold FACTORY-RACING graphics, slim bodywork, and a textured seat designed for grip when standing. Though simple in its technology, it offers thoughtful details like air-box accessibility and a user-serviceable layout made for hands-on learning. Lightweight and agile, this bike is ideal for track days, motocross training, first-time competition, or just building confidence—making it a versatile choice for aspiring young riders.
SPECIFICATION

PRICE

On The Road Price From £4,199

ENGINE & TRANSMISSION

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​Design​1-CYLINDER, 2-STROKE ENGINE
​Displacement​49.9 CM³
​Transmission​SINGLE-SPEED AUTOMATIC 
​EMS​DELL'ORTO PHBG 19 BS 
​Engine Oil ​ATF "MOROTEX DEXRON 3" 
Clutch primary drive teeth​61
​Primary Drive ​33:61
​Clutch​CENTRIFUGAL CLUTCH (ADJUSTABLE)
​Engine Cylinder ​SINGLE CYLINDER 
​Engine stroke ​2-STROKE

CHASSIS

Frame DesignCENTRAL-TUBE FRAME WITH DOUBLE-CRADLE
Front Brake DISC BRAKE
Rear Brake ​DISC BRAKE
​Rear subframe design​STEEL / POLYAMIDE GLASS FIBER 
​Chain​415, NON-SEALED
​Front Suspension​XACT 35 WP UPSIDE-DOWN FORK, 0 35 MM 
Rear Suspension​XACT WP MONO SHOCK
​Suspension travel (front) ​200.6 MM
​Suspension travel (rear) 
​190.5 MM 
​Front suspension adjustment ​COMPRESSION AND REBOUND ADJUSTABLE
​Rear suspension setting​COMPRESSION AND REBOUND ADJUSTABLE 

DIMENSIONS & WEIGHTS

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​Seat height 653 MM
​Ground clearance ​233 MM
​Tank capacity (approx.)​2.3 L

FUEL CONSUMPTION

    

STANDARD EQUIPMENT

   

OPTIONAL EQUIPMENT

   

OPTIONAL ACCESSORIES

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