Quick Analysis
KTM 50 SX
11.5 pts
Unweighted: 6 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
Honda Activa 6G
27.5 pts
Unweighted: 23 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | — | Air-cooled |
| Displacement | 49.9 cc | 109.51 cc |
| Engine Type | 1-cylinder, 2-stroke engine | 4 stroke, SI Engine |
| Power | 5.3 bhp @ 11500 rpm | 7.99 PS @ 8000 rpm |
| Torque | 5.2 Nm @ 7500 rpm | 9.05 Nm @ 5500 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 2.3 L | 5.3L |
| Mileage | 30 kmpl | 47Kmpl |
Dimensions & Weight |
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| Kerb Weight | 41 kg | 106 |
| Seat Height | 653 mm | 765 |
Brakes & Suspension |
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| ABS | — | No, CBS (Combi Brake System) across all variants |
| Front Brake | Disc 160 mm | Drum, 130 mm |
| Front Suspension | XACT 35 WP Upside-Down fork, Ø 35 mm | Telescopic |
| Rear Brake | Disc 160 mm | Drum, 130 mm |
| Rear Suspension | XACT WP mono shock | 3 Step Adjustable Unit Swing |
Tyres & Wheels |
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| Front Tyre | 60/100 - 12 | 90/90-12 54J |
| Rear Tyre | 2.75 - 10 | 90/100-10 53J |
| Tyre Type | Tubed | Tubeless |
| Wheel Type | Spoke | Alloy |
Features & Technology |
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| Headlight | — | Halogen/LED DC headlamp |
Other Specifications |
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| Battery | — | 12 V, 5.0 Ah (MF) |
| Bike Image 1 | — | https://motoautiv.com/wp-content/uploads/2026/03/Mat-Axis-Gray-Metallic-2.avif |
| Bike Image 2 | — | https://motoautiv.com/wp-content/uploads/2026/03/Rebel-Red-Metallic-2.avif |
| Bike Image 3 | — | https://motoautiv.com/wp-content/uploads/2026/03/metallic-black-2.avif |
| Bike Image 4 | — | https://motoautiv.com/wp-content/uploads/2026/03/Pearl-Siren-Blue-4.avif |
| Bike Image 5 | — | https://motoautiv.com/wp-content/uploads/2026/03/Pearl-Precious-White-2.avif |
| Bike Image 6 | — | https://motoautiv.com/wp-content/uploads/2026/03/Pearl-Igneous-Black-2.avif |
| Bike Image 7 | — | https://motoautiv.com/wp-content/uploads/2026/03/siren-blue-2.avif |
| Color Options | Electronic Orange | Rebel Red Metallic | #A61C2E Pearl Siren Blue | #2A5BA8 Pearl Precious White | #F5F5F5 Pearl Igneous Black | #0B0B0B Mat Axis Gray Metallic | #6B6F73 Decent Blue Metallic | #1A3F7A Mat Steel Black Metallic | #2C2C2C Pearl Siren Blue | #2E5CAD |
| 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. | Stiff rear suspension Average performance and pickup Vibrations at certain speeds |
| 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 Honda Activa 6G is a 110cc automatic scooter built around a step-through frame and a single-cylinder engine platform. The scooter is powered by a 109.51cc four-stroke, air-cooled engine that uses programmed fuel injection (PGM-FI) for fuel delivery. This engine produces 7.99 PS of power at 8000 rpm and 9.05 Nm of torque at 5500 rpm, figures that sit within the typical output range for 110cc automatic scooters in the Indian market. Power is transmitted through a V-matic CVT transmission, which removes the need for manual gear changes and adjusts drive ratio continuously based on engine speed and throttle input. The engine incorporates Enhanced Smart Power (eSP) technology, which integrates mechanical components aimed at reducing internal friction during operation. The scooter also uses ACG starter technology, which reduces starter motor noise compared with conventional starter systems. These features work alongside the fuel injection system to manage combustion and throttle response during operation. The fuel tank holds 5.3 litres, with actual riding range depending on fuel consumption and riding conditions. The ARAI claimed mileage figure is 59.5 km/l, though real-world figures vary depending on traffic, riding style, and maintenance state. The scooter includes an external fuel filler cap positioned such that the rider can refuel without opening the seat compartment. The suspension setup consists of telescopic front forks and a 3-step adjustable spring-loaded hydraulic rear unit, replacing the leading-link front suspension used in earlier Activa models. The scooter rides on a 12-inch front wheel and a 10-inch rear wheel, both fitted with tubeless tyres and alloy rims on the Deluxe and H-Smart variants. Braking at both ends is handled by 130mm drum brakes, supported by a Combi-Brake System (CBS) with equaliser, which distributes braking force between both wheels when the rear brake lever is applied. No disc brake or ABS option is available across any variant. The scooter measures 1833mm in length, 677mm in width, and 1165mm in height, with a wheelbase of 1260mm. Ground clearance stands at 162mm and seat height at 765mm. Kerb weight is 106kg, placing it within the typical weight range for scooters in this segment. The instrument cluster is a semi-digital unit displaying speed, fuel level, and basic ride indicators. Lighting across the range includes an LED headlamp, LED tail lamp, and LED turn indicators. All variants include electric start, with the Standard and Deluxe also offering a kick start as a backup. The H-Smart variant adds a smart key system with remote locking, keyless ignition, and an engine immobiliser, along with a TFT display with Bluetooth connectivity and a USB Type-C charging port. |
| Expert Review | MotoAutiv Team | The Activa 6G remains the default choice for urban commuters — reliable, fuel-efficient enough for daily use, and now with genuinely useful tech on the H-Smart variant. But it is coasting on brand trust more than engineering leadership. The suspension tuning feels dated on broken city roads, the real-world mileage falls 20% short of claimed figures, and the absence of even an optional disc brake is hard to justify as rivals close the gap. If you want the safest resale value and the widest service network, buy it. If you want the best scooter for the money in 2026, keep looking., 3.9, 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 mileage do owners actually get from Activa 6G? A: Most owners report 45–50 km/l in city conditions, though mileage may drop during the initial running period. Some users say mileage improves after the first service and proper maintenance. Q: Does Activa 6G vibrate around 60-70 km/h? A: Several owners report handlebar and body vibrations at speeds around 60–70 km/h. This is a common complaint and usually happens due to engine tuning, loose panels, or worn components. Q: Is Activa 6G good for long rides? A: The scooter is mainly designed for city commuting. For long rides above 60 km/h, some riders experience discomfort because of firm suspension and vibrations. Q: Are the brakes on Activa 6G strong enough? A: Some users say the drum brakes feel weak during sudden braking, and many owners wish Honda offered a front disc brake option for better safety. Q: Is the Activa 6G reliable for long-term ownership? A: Many long-term owners report low maintenance and reliable engine performance even after tens of thousands of kilometers, which is one reason Activa remains a popular scooter in India. |
| Fuel System | — | PGM-Fi |
| Price Variants | | 475000 | Standard | 75433| Drum Brakes, Steel Wheels, Analogue console | Halogen bulb | Standard Key Deluxe | 85335 | Drum Brakes, Alloy Wheels | Digital console | LED | Standard Key H-Smart | 89806 | Drum Brakes, Alloy Wheels | Digital console | LED | Remote (Smart) Key |
| 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. | Excellent engine Good fuel efficiency Low maintenance and service cost Strong resale value |
| Starter | — | Self/Kick |
| Transmission | Manual | CVT (Automatic) |
