Quick Analysis
KTM 50 SX
7.0 pts
Unweighted: 4 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
SUZUKI GIXXER SF/ GIXXER
29.5 pts
Unweighted: 21 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | — | Air Cooled |
| Displacement | 49.9 cc | 155 cm³ |
| Engine Type | 1-cylinder, 2-stroke engine | 4-Cycle, 1-cylinder, Air cooled |
| Power | 5.3 bhp @ 11500 rpm | 13.4ps@8000rpm |
| Torque | 5.2 Nm @ 7500 rpm | 13.8Nm@6000rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 2.3 L | 12 l |
| Mileage | 30 kmpl | 45 kmpl |
Dimensions & Weight |
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| Kerb Weight | 41 kg | 148 kg |
| Seat Height | 653 mm | 795 mm |
Brakes & Suspension |
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| ABS | — | Dual Channel |
| Front Brake | Disc 160 mm | Disc 266 mm Caliper - Front 2 Piston |
| Front Suspension | XACT 35 WP Upside-Down fork, Ø 35 mm | Telescopic |
| Rear Brake | Disc 160 mm | Disc 240 mm Caliper - Real 1 Piston |
| Rear Suspension | XACT WP mono shock | Swing Arm |
Tyres & Wheels |
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| Front Tyre | 60/100 - 12 | 100/80-17M/C 52P |
| Rear Tyre | 2.75 - 10 | 140/60R17M/C 63P |
| Tyre Type | Tubed | Tubeless |
| Wheel Type | Spoke | Alloy |
Features & Technology |
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| Headlight | — | LED |
Other Specifications |
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| Battery | — | Maintenance free 12V, 3Ah |
| Bike Image 1 | — | https://motoautiv.com/wp-content/uploads/2025/11/gixxersfglasssparkleblack.webp |
| Bike Image 2 | — | https://motoautiv.com/wp-content/uploads/2025/11/gixxersfgreyandred.webp |
| Bike Image 3 | — | https://motoautiv.com/wp-content/uploads/2025/11/gixxersfmettritonblueandpearlglacierwhite.webp |
| Color Options | Electronic Orange | Grey and Red Glass Sparkle Black Met Oort Gray and Met Lush Green Met Triton Blue and Pearl Glacier White |
| 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. | Being a 155 cc bike, it may feel underpowered if you seek high-speed performance or aggressive acceleration. Single-channel ABS is not as comprehensive as dual-channel ABS for maximum safety. With a modest fuel tank capacity, long-distance rides may require more frequent refueling. Not designed for heavy loads, long tours, or aggressive highway use — better suited to city and moderate-distance riding. Overall performance and comfort may feel basic compared to higher-end or larger-displacement bikes. |
| 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. | Riding the Gixxer SF feels like having a sensible yet sporty companion on two wheels — not a wild streetfighter, but a refined, well-balanced bike that adapts easily to both city commutes and occasional bursts of fun. Its heart is a 155 cc air-cooled, single-cylinder, 4-stroke engine that uses fuel injection and SOHC valve gear. That compact engine is modest on paper — about 13.6 PS at 8,000 rpm and 13.8 Nm at 6,000 rpm — but it’s tuned for reliability, smoothness, and predictable behaviour rather than raw aggression. On a typical day, that means smooth starts, no jerks at low revs, and enough grunt to handle medium-speed cruising or quick overtakes without straining. Because it’s air-cooled and relatively simple, the Gixxer SF doesn’t demand exotic maintenance. That translates in real life to lower upkeep costs and fewer worries about overheating — something especially welcome in hot Indian summers or long commutes. Coupled with a 5-speed gearbox and wet-multiplate clutch, gear changes are light and intuitive. In city traffic the bike feels nimble, while on open roads the power delivery remains steady, giving a calm, controlled sense of speed rather than aggressive thrust. Climbing onto the bike, you notice its compact footprint. With a length of 2025 mm, width of 715 mm and height around 1035 mm, the Gixxer SF feels trim and manageable, especially compared to larger fair-bodied bikes. The seat sits at about 795 mm — low enough for many riders to reach the ground with confidence — which helps at traffic stops or when maneuvering tight U-turns. Its kerb weight of 148 kg feels light enough to flick around city corners yet solid enough not to get shaken by bumps on rough roads. Ground clearance is respectable (165 mm), giving you breathing room over speed-breakers, broken patches or uneven road surfaces without scraping under-belly, which is a plus on Indian roads. Suspension-wise, the front telescopic forks and rear swing-arm setup strike a nice balance. On city roads strewn with potholes or speed-bumps, the ride remains forgiving — you don’t feel every little crack harshly. On smoother stretches or while riding steadily, the bike stays composed and doesn’t wallow or feel floaty. It doesn’t pretend to be a dirt-bike — you don’t want to take it off-road — but for everyday mixed road conditions, it offers a ride that’s simply comfortable and predictable. Stopping confidence comes from disc brakes on both wheels, assisted by a single-channel ABS system. That’s a real advantage during sudden traffic snarls, wet roads, or unexpected obstacles: braking feels stable, controlled, and reassuring — not like the nervous grab of a budget bike, but like a mature, dependable braking system. Visually and practically, the Gixxer SF has its touches. The fully-faired body gives it a sporty, aerodynamic look — smart for those who care about style but also functional for a smoother airflow at speed. LED lighting (headlamp and tail lamp) helps visibility on night rides or in dim conditions, and alloy wheels with tubeless tyres balance grip and practicality. A 12-litre fuel tank might seem modest, but considering the engine size and the bike’s overall efficiency, it means frequent fuel-ups aren’t painful — manageable for daily commutes or shorter weekend rides. In real-world use, the Gixxer SF feels like a carefully thought-out compromise: not overly powerful to be tricky in traffic, not too heavy to be unwieldy, and not too basic to feel outdated. It tends to reward balanced, moderate riding: use gentle throttle inputs in the city and smooth gear shifts, and you get a calm, efficient ride; open up a bit on wider roads and you feel enough responsiveness to feel alive — without the bike feeling stressed or nervous. For a rider living in Indian towns or cities — where you encounter crowded streets, unpredictable traffic, rough patches, and occasional longer weekend runs — the Gixxer SF shines as a practical, dependable everyday machine. It doesn’t promise thrills like a high-end performance bike, but it doesn’t disappoint on usability either. You get ease, predictability, comfort, and a dash of sporty attitude — enough to make daily commuting enjoyable and occasional riding satisfying. In short: the Gixxer SF isn’t about extremes. It’s about balance — a good entry (or second) bike that feels friendly, manageable, and versatile. Whether you’re weaving through busy roads, cruising with a bit of pace, or riding casually with smooth control, it remains composed, confident, and dependable. |
| 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 mileage of the Gixxer SF? A: The mileage is generally around 40–45 kmpl in real-world riding. Q: What is the engine capacity? A: It comes with a 155 cc, air-cooled, single-cylinder engine. Q: How much power does it produce? A: It produces about 13.6 PS of power at 8,000 rpm. Q: What is the torque output? A: The torque is 13.8 Nm at 6,000 rpm. Q: Does the Gixxer SF have ABS? A: Yes, it comes with single-channel ABS. Q: What is the seat height? A: The seat height is approximately 795 mm. Q: What is the kerb weight? A: The kerb weight is about 148 kg. Q: What is the fuel tank capacity? A: The fuel tank can hold 12 litres of fuel. Q: What type of suspension does it use? A: It has telescopic front forks and a rear monoshock. Q: Are the tyres tubeless? A: Yes, it comes with tubeless tyres. Q: Does it use LED lighting? A: Yes, both the headlamp and tail lamp are LED units. Q: What type of brakes does it have? A: It uses disc brakes at the front and rear. Q: Is it suitable for daily commuting? A: Yes, its light weight, refined engine, and comfortable riding posture make it ideal for daily city use. |
| Fuel System | — | Fuel Injection |
| Price Variants | | 475000 | | 136640 |
| 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. | The 155 cc engine is smooth and predictable, making it ideal for city rides and daily commuting. Lightweight build and manageable kerb weight make it easy to maneuver in traffic or tight spaces. Comfortable seat height and posture — accessible for many riders, and practical for regular use. Suspension setup strikes a balance between absorbing bumps and providing stable handling over varying roads. Disc brakes with ABS add good stopping power and safer braking performance in unexpected situations. LED lighting and tubeless tyres add modern practicality and convenience. Good fuel economy — efficient for frequent commuting and moderate-distance rides. |
| Starter | — | ELECTRIC |
| Transmission | Manual | 5 Speed Manual |
