Quick Analysis
KTM 50 SX
1.0 pts
Unweighted: 2 advantages
EnginePerformanceDimensionsBrakesTyresOther
KTM 250 SX-F
33.5 pts
Unweighted: 17 advantages
EnginePerformanceDimensionsBrakesTyresOther
| Specification | ||
|---|---|---|
Engine Specifications |
||
| Cooling System | — | Liquid cooled |
| Displacement | 49.9 cc | 249.9 cc |
| Engine Type | 1-cylinder, 2-stroke engine | 1-cylinder, 4-stroke engine |
| Power | 5.3 bhp @ 11500 rpm | 46.1 bhp @ 13900 rpm |
| Torque | 5.2 Nm @ 7500 rpm | 26.5 Nm @ 9500 rpm |
Performance & Efficiency |
||
| Fuel Tank Capacity | 2.3 L | 7.2 L |
| Mileage | 30 kmpl | 40 kmpl |
Dimensions & Weight |
||
| Kerb Weight | 41 kg | 104 kg |
| Seat Height | 653 mm | 958 mm |
Brakes & Suspension |
||
| ABS | — | Dual Channel ABS |
| Front Brake | Disc 160 mm | Disc 260 mm |
| Front Suspension | XACT 35 WP Upside-Down fork, Ø 35 mm | WP XACT-USD (AER), Ø 48 mm |
| Rear Brake | Disc 160 mm | Disc 220 mm |
| Rear Suspension | XACT WP mono shock | WP XACT Monoshock with linkage |
Tyres & Wheels |
||
| Front Tyre | 60/100 - 12 | 80/100 - 21 |
| Rear Tyre | 2.75 - 10 | 110/90 - 19 |
| Tyre Type | Tubed | Tubeless |
| Wheel Type | Spoke | Alloy |
Other Specifications |
||
| Color Options | Electronic Orange | Orange |
| Cons | High Maintenance: As a 2-stroke engine, it requires frequent servicing and tuning. Small Fuel Tank: Limited capacity means more frequent refills. Kick-Start Only: No electric start, which can be tricky for very young riders. Limited Power for Older Kids: The 50cc engine may not be enough as the rider grows or becomes more skilled. Sensitive to Tuning: Owners report issues like fouling spark plugs or needing to frequently re-jet the carb: “Used to run great … then started fowling plugs … Moved to a 95 main jet … About 15 kph slower …” Parts Cost & Availability: As a race‑oriented bike, some parts can be expensive or harder to source for older models. | High Power-to-Weight Ratio: The 249.9 cc 4-stroke engine produces very strong power, and the bike is quite light — making it very agile and fast. Advanced Electronics: Comes with launch control, two engine maps, traction control, and quickshifter — very race-oriented features. Premium Suspension: Uses WP XACT forks and rear shock (310 mm / 300 mm travel) that are very capable for jumps and rough track terrain. Excellent Chassis Flex & Control: Updated frame in newer models improves flex, which helps in cornering and gives more control. Electric Start: Equipped with a self-starter (lithium-ion battery), which is very handy on the track. Strong Brakes & Clutch: Uses Brembo hydraulics for the clutch and good brake setup — helps with precise control under race conditions. Good for Track Riders: Designed for serious motocross use — responsive, fast, and optimized for racing-style riding. |
| Detailed Overview | The KTM 50 SX is a purpose-built mini motocross bike, tailored primarily for very young and beginner racers who want to get a genuine motocross experience without jumping straight to bigger bikes. It’s more than just a “toy” — KTM has packed serious race-bike DNA into this 50cc model, making it a standout choice for youth motocross training and competitive racing. At the heart of the 50 SX is a 49.9 cc single-cylinder 2-stroke engine, which delivers a punchy yet manageable power output. According to KTM’s specs, this engine is paired with a centrifugal automatic clutch, meaning there’s no manual clutch lever to worry about — the clutch engages automatically, which is ideal for young riders still building coordination and confidence. The engine uses a Seletra 2p D36 system for fuel delivery (on some models), which helps in precise tuning and reliable performance. KTM has thoughtfully designed the chassis for both strength and agility. The frame is made from chromoly steel, which keeps it light but sturdy. The overall design ensures that the bike is highly maneuverable, making it easier for young riders to learn balance and control on a real race-ready structure. The 50 SX isn’t just about motor and frame — it comes with serious suspension too: a WP XACT 35 mm upside-down fork at the front and a WP mono‑shock at the rear.The front suspension travel is around 200 mm and the rear is close to 190 mm, giving enough give for track bumps and jumps. In terms of ergonomics, the seat height is just 653 mm, making it very accessible for younger riders. Ground clearance is around 233 mm, giving the bike enough space to handle uneven terrain without scraping too much.The fuel tank capacity is modest — 2.3 liters — but that’s more than enough for short motocross sessions that young riders typically do. For braking, KTM hasn’t compromised: the 50 SX is equipped with disc brakes both front and rear, each 160 mm in size. This provides good stopping power and control, which is very important for safety and learning advanced braking techniques. On the wheels front, the bike uses spoke wheels, keeping things light and rugged for off-road racing. Despite its small size, the 50 SX is very race-focused. The frame has been redesigned to mimic the flex and rigidity characteristics of full-size MX bikes. The new frame also comes with frame protectors, which help reduce damage in case of falls — a common occurrence when young riders are learning. The handlebars are lightweight aluminum, with a bend that suits smaller riders, and the footpegs are designed to give a solid grip even when things get muddy or rough. KTM also includes power-reduction kits in its parts catalog for the 50 SX. These kits let parents or coaches limit the power output while the rider is still learning, which is a smart way to scale the bike’s performance to the rider’s ability — and once they’re better, the full power can be unlocked. When it comes to reliability, the 50 SX has a liquid cooling system for better thermal management. The engine’s central crankshaft design helps in keeping the mass well-balanced, which contributes to smoother handling. As for maintenance, like all 2-stroke motorcycles, it does need regular care — but KTM has made key parts (like the clutch) durable, using a reinforced clutch basket for longevity. Overall, the KTM 50 SX is a very well-engineered youth motocross bike that brings real race performance to younger riders. It balances power, weight, and control in a way that helps beginners grow into serious racers. Whether for track training, competitive racing, or just building early riding skills, it’s absolutely one of the top choices in the mini-moto world. | The KTM 250 SX‑F is a purpose-built motocross machine that combines race-ready performance, lightweight agility, and advanced electronics to deliver an exhilarating experience for serious off-road riders. As part of KTM’s renowned motocross lineup, the 250 SX‑F is designed for track dominance, providing the perfect balance of power, handling, and precision for competitive riding. Its 249.9 cc, four-stroke, single-cylinder, liquid-cooled engine is tuned to deliver strong, high-revving power that is immediately responsive to throttle inputs. This makes it exceptionally capable on tight corners, jumps, and technical track sections, giving riders a confident and aggressive edge in race situations. One of the standout features of the 250 SX‑F is its lightweight chassis. The bike benefits from KTM’s proprietary trellis frame, which offers a perfect blend of stiffness and controlled flex. This results in excellent stability at high speeds while also allowing precise feedback through the handlebars and footpegs. The frame’s low weight, combined with the compact engine, ensures the bike is agile and easy to maneuver—qualities that are especially important when navigating tight motocross tracks or technical off-road terrain. The overall kerb weight remains impressively low, which reduces rider fatigue and enhances the bike’s responsiveness. The 250 SX‑F’s suspension system is another highlight. It features WP XACT 48 mm inverted front forks and a WP XACT rear shock with linkage, delivering around 310 mm of front travel and 300 mm of rear travel. This setup allows the bike to absorb big jumps, handle rough terrain, and maintain traction even under extreme stress. Both the forks and the rear shock are fully adjustable, enabling riders to fine-tune the bike for their preferred riding style or track conditions. The combination of suspension, frame geometry, and lightweight design makes the KTM 250 SX‑F exceptionally capable at both high-speed sections and technical, slower parts of the track. Modern electronics further enhance the riding experience. The 250 SX‑F is equipped with launch control, which optimizes starts and reduces wheel spin. Additionally, it offers selectable engine maps and traction control, providing riders with the ability to adapt the bike’s power delivery to track conditions or personal preference. The inclusion of a quickshifter enables seamless clutchless gear changes, maintaining momentum during aggressive racing. While minimal compared to street motorcycles, these electronic aids give riders an advantage without sacrificing the raw, track-focused feel that motocross enthusiasts demand. The ergonomics of the 250 SX‑F are designed with performance in mind. A tall seat height, wide handlebars, and a compact, upright riding position make it ideal for both sitting and standing on the pegs, which is essential for maneuvering over rough terrain and jumps. The bike also features an electric start, a convenience that eliminates the need for kick-starting and enhances usability on the track. Despite its racing pedigree, the 250 SX‑F comes with some compromises. Its fuel tank is relatively small, limiting the bike’s range to short race sessions rather than long trail rides. Maintenance is more frequent compared to casual dirt bikes, as high-performance components require careful attention. The tall seat height may also challenge shorter riders, and its race-oriented suspension can feel harsh on less demanding trails. In summary, the KTM 250 SX‑F is a high-performance motocross machine designed for riders who demand precision, agility, and race-ready power. Lightweight, technologically advanced, and built with competition in mind, it offers an exhilarating experience for those seeking to dominate motocross tracks. It is not a casual trail bike, but for dedicated racers and serious off-road enthusiasts, it stands out as one of the most capable and exciting 250-class motocross motorcycles on the market. |
| Expert Review | MotoAutiv Team | MotoAutiv Team |
| FAQ (Manual Override) | Q: What is the engine capacity of the KTM 50 SX? A: It has a 49.9 cc 2-stroke engine. Q: What kind of transmission does it use? A: The KTM 50 SX has a single-speed automatic transmission. Q: How is the KTM 50 SX started? A: It uses a kick-start. Q: Does it have a clutch? A: Yes — a centrifugal (adjustable) clutch, so the rider doesn’t have to use a manual clutch lever. Q: What is the fuel tank capacity? A: The fuel tank capacity is 2.3 litres. Q: What is the seat height? A: The seat height is 653 mm. Q: What is the weight of the bike? A: The dry (or “without fuel”) weight is about 43.5 kg for recent models. Q: What kind of suspension does the KTM 50 SX use? A: It comes with WP XACT suspension — a 35 mm upside-down fork in the front and a WP mono-shock at the rear. Q: What brakes does it have? A: It has disc brakes both at the front and rear, each 160 mm. Q: What power does the KTM 50 SX produce? A: The KTM 50 SX produces around 5.3–5.4 PS at ~11,500 rpm. Q: Is the KTM 50 SX road legal? A: No — it's designed for off-road / motocross use, not for street-legal riding. Q: What kind of clutch does it have for young riders? A: It uses a centrifugal clutch, which automatically engages at high RPM — good for beginners or young riders who don’t manually operate a clutch. Q: What is the ground clearance? A: The ground clearance is 233 mm. Q: Is there a guarantee or warranty for KTM 50 SX? A: According to specs, it has a 2-year standard warranty. Q: What is the typical maintenance challenge or issue to watch for? A: Some owners report carburetor tuning issues | Q: What is the engine capacity and type of the KTM 250 SX-F? A: It is powered by a 249.9 cc, 4-stroke, single-cylinder, liquid-cooled engine. Q: How much power and torque does it produce? A: The KTM 250 SX-F produces around 40 PS of power (approximately) — tuned for high-rev motocross performance. Q: What transmission does the 250 SX-F use? A: It uses a 5-speed gearbox. Q: Does the 250 SX-F have an electric starter? A: Yes, the KTM 250 SX-F comes with an electric self-starter, which is very useful for motocross starting. Q: What suspension setup does it have? A: It features WP XACT 48 mm USD forks at the front and a WP XACT linkage rear shock, tuned for motocross performance. Q: What are the brake specifications and ABS on the 250 SX-F? A: The 250 SX-F is fitted with disc brakes front and rear. Since it's a motocross (off-road) bike, it does not typically have road-legality ABS — it's built for track use. Q: What is the seat height and ground clearance? A: The seat height is very high (race-MX spec) — it's designed for standing and aggressive riding on dirt. Ground clearance is also high, optimized for motocross terrain. Q: What is the fuel capacity of the 250 SX-F? A: The fuel tank is relatively small, designed more for race duration than long touring. Q: Does the 250 SX-F come with any electronic rider aids? A: It has selectable engine maps (for different performance characteristics) and traction control, though it's minimal compared to street motorcycles. Q: What kind of instrument or dash does it use? A: The 250 SX-F typically does not use a full digital dash like street bikes — it's race-oriented and focuses on weight savings. Q: Is the 250 SX-F good for both racing and trail riding? A: It’s primarily designed for motocross racing (track use), but experienced off-road riders might use it on trails — performance and setup are more race-oriented than touring. |
| Price Variants | | 475000 | | 958000 |
| Pros | Very Lightweight: Makes it easy for young riders to handle and build confidence. Automatic Transmission: The centrifugal clutch and automatic gearbox simplify riding for beginners. Adjustable Suspension: High-quality WP fork and shock can be tuned to rider weight and track conditions. Racing‑Oriented Build: Frame and components are derived from KTM’s full-size SX range, giving a race-ready feel. Power-Reduction Kits Available: Helps beginners by limiting power until they’re ready for more. Good Cooling: Liquid cooling ensures the engine stays healthy even under hard off‑road use. Tool-Free Adjustability: Seat height, suspension, and other parts can be adjusted without special tools. | High Power-to-Weight Ratio: The 249.9 cc 4-stroke engine produces very strong power, and the bike is quite light — making it very agile and fast. Advanced Electronics: Comes with launch control, two engine maps, traction control, and quickshifter — very race-oriented features. Premium Suspension: Uses WP XACT forks and rear shock (310 mm / 300 mm travel) that are very capable for jumps and rough track terrain. Excellent Chassis Flex & Control: Updated frame in newer models improves flex, which helps in cornering and gives more control. Electric Start: Equipped with a self-starter (lithium-ion battery), which is very handy on the track. Strong Brakes & Clutch: Uses Brembo hydraulics for the clutch and good brake setup — helps with precise control under race conditions. Good for Track Riders: Designed for serious motocross use — responsive, fast, and optimized for racing-style riding. |
| Starter | — | Electric starter |
| Transmission | Manual | 5 Speed Manual |
