Quick Analysis
KTM 50 SX
13.5 pts
Unweighted: 6 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 390 Adventure
18.5 pts
Unweighted: 14 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Displacement | 49.9 cc | 398.63 |
| Engine Type | 1-cylinder, 2-stroke engine | — |
| Power | 5.3 bhp @ 11500 rpm | 46 @ 8500 |
| Torque | 5.2 Nm @ 7500 rpm | 39 @ 6500 |
Performance & Efficiency |
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| Fuel Tank Capacity | 2.3 L | 14.5 |
| Mileage | 30 kmpl | 27.5 kmpl |
Dimensions & Weight |
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| Kerb Weight | 41 kg | 182 |
| Seat Height | 653 mm | 830 |
Brakes & Suspension |
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| ABS | — | Switchable ABS |
| Front Brake | Disc 160 mm | Disc Front 320 mm 2 Piston |
| Front Suspension | XACT 35 WP Upside-Down fork, Ø 35 mm | WP Upside-Down Forks |
| Rear Brake | Disc 160 mm | Disc Front 240 mm 1 Piston |
| Rear Suspension | XACT WP mono shock | Monoshock with Preload and Rebound Adjustment |
Tyres & Wheels |
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| Front Tyre | 60/100 - 12 | 90/90 x 21 |
| Rear Tyre | 2.75 - 10 | 130/80x17 |
| Tyre Type | Tubed | Tubeless |
| Wheel Type | Spoke | Alloy |
Features & Technology |
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| Headlight | — | LED headlamp |
Other Specifications |
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| Bike Image 1 | — | https://motoautiv.com/wp-content/uploads/2025/11/KTM-390-Adventure_White.webp |
| Color Options | Electronic Orange | Electronic Orange Ceramic 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. | High Seat Height: The tall seat (830 mm or more) may be challenging for shorter riders to handle, especially when off-road. Vibrations: The single-cylinder engine can produce significant vibration at higher RPMs, which might reduce comfort on long rides. Wind Turbulence: Due to the slim fairing and windscreen design, riders can feel wind buffeting at high speeds. Limited Low-End Torque: While power is good, the engine’s torque at very low RPMs can feel a bit lacking, requiring frequent downshifts. Firm Suspension for City Use: The long-travel suspension is optimized for rougher roads but may feel harsh on smooth city streets. Electronics Complexity: With its rich electronics suite, it can be overwhelming for beginners or riders who prefer simplicity; also, more electronic components mean higher maintenance risk. Rear Seat Comfort: The pillion seat and footpeg position may not be very comfortable for long rides or standing on trails. Service Cost: Premium suspension, electronics, and design make its maintenance cost higher than typical commuter 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. | The KTM 390 Adventure is a refined mid-sized adventure bike that skillfully balances on-road usability with real off-road capability, making it appealing for both everyday commuters and weekend explorers. The 2025 generation brings significant upgrades, including a more powerful 398.6-cc LC4c single-cylinder engine, which produces about 46 PS at 8,500 rpm and 39 Nm of torque at 6,500 rpm. This increase in displacement over its predecessor provides smoother power delivery, better low-end grunt, and added reserve for spirited riding. One of the biggest draws of the 390 Adventure is its chassis and suspension setup, which is built to handle a variety of surfaces. It now runs on a 21-inch front wheel and 17-inch rear wheel, both spoke-tubed, which improves its off-road capability. The front suspension is handled by WP APEX 43 mm USD forks with 200 mm of travel, while the rear gets a monoshock with 205 mm of travel, offering impressive compliance and control over rough terrain. Ground clearance has also been raised to 227 mm, giving it a more aggressive off-road stance. Despite its off-road chops, the 390 Adventure remains comfortable for everyday commuting and long-distance touring. Its seat height is lowered to 830 mm, making it more accessible for a wider range of riders. The ergonomic design includes an upright riding position, wide handlebars, and a well-padded seat, allowing for hours in the saddle without too much fatigue. Fuel capacity is 14.5 liters, which, when combined with its efficiency, gives it an impressive practical range — many riders estimate over 300 km on a full tank. Electronics are a highlight for this model. The 390 Adventure comes loaded with cornering ABS, switchable off-road ABS, traction control (MTC), ride-by-wire throttle, and several riding modes (such as Street, Rain, Off-road). It also includes a bi-directional quickshifter and slipper-assist clutch, making gear changes smoother and more seamless. The instrument cluster is a bright, 5-inch TFT display with Bluetooth connectivity via KTM MY RIDE, allowing for turn-by-turn navigation, call alerts, and music control. On the road, the 390 Adventure excels with its agile frame and manageable weight (kerb weight is about 182 kg per KTM’s 2025 spec sheet), which contribute to confidence in both urban traffic and fast highway runs. The power delivery is linear yet responsive, making overtakes easy and enjoyable. Off-road, the bike’s long-travel suspension, tall wheels, and electronic aids allow it to tackle gravel, dirt trails, and light terrain with surprising competence. That said, there are some trade-offs. The fuel efficiency on real-world rides can be lower than claimed, especially when pushing hard or riding in mixed terrain: in a Team-BHP test, the observed economy dipped to ~20 km/l under aggressive or mixed usage. Also, some riders note that the seat could benefit from softer padding for very long rides, and wind protection is moderate despite the adjustable windscreen. In summary, the KTM 390 Adventure is a well-rounded and highly capable machine for riders who want an accessible, lightweight ADV that doesn’t compromise on performance or electronics. Whether you’re doing daily commuting, touring through highways, or exploring off-road trails, this bike gives you a compelling mix of versatility, modern tech, and genuine adventure DNA — all wrapped up in KTM’s signature ‘Ready to Race’ spirit. |
| 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, power & torque of the KTM 390 Adventure? A: The KTM 390 Adventure has a 373.2 cc single-cylinder, liquid-cooled engine. In newer or updated versions, the displacement is ~398.6 cc, producing 46 PS and 39 Nm of torque. Q: What kind of transmission does it use? A: The bike uses a 6-speed gearbox. Q: What’s the fuel tank capacity and how much fuel can it carry? A: The 390 Adventure has a 14.5-litre fuel tank. Q: What is the seat height & ground clearance of the bike? A: The standard seat height is 830 mm (or 855 mm on some variants) per the spec sheet. The ground clearance is about 200 mm. Q: What suspension setup does the 390 Adventure have? A: It is equipped with WP APEX 43 mm USD front forks and a WP APEX monoshock at the rear. Q: What are the braking systems and ABS features? A: The bike uses 320 mm front disc and 230 mm rear disc. For safety, it comes with cornering ABS and off-road ABS mode. Q: What rider aids / electronics does the 390 Adventure come with? A: It features motorcycle traction control (MTC) with a 3D IMU, switchable ABS, a ride-by-wire throttle, and riding modes. Bajaj Auto It also has a slipper-assist clutch. Q: What kind of instrument cluster is fitted on the 390 Adventure? A: The bike comes with a 5-inch TFT display that shows information like speed, trip, fuel, gear position, and more. Q: Is the 390 Adventure suitable for touring and off-road use? A: Yes — with its long-travel suspension (170 mm front, 177 mm rear), decent ground clearance, and off-road ABS mode, it is designed to handle light to moderate off-road trails as well as long touring trips. Q: What is the kerb weight of the KTM 390 Adventure? A: The kerb (or wet) weight is around 183 kg according to Autocar India. Q: What is the mileage (fuel efficiency) of the 390 Adventure? A: According to Autocar India, the 390 Adventure’s claimed mileage is around 30 km/l. Some real-world riders report similar or slightly varied fuel efficiency. Q: Are there any common user-reported issues or complaints? A: Yes, some users on forums mention the fuel range display can be optimistic. > “On a full tank […] I usually see around … 350-420 km to the tank.” Also, being a lightweight ADV, some riders note wind turbulence at higher speeds due to its light frame. |
| Price Variants | | 475000 | | 394699 |
| 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 Power-to-Weight Ratio: Its 373 cc engine delivers strong performance while keeping the bike relatively light, ideal for both touring and trails. Advanced Electronics Suite: Equipped with features like traction control, cornering ABS, quickshifter, and ride modes — a very modern setup. Long-Travel Suspension: WP APEX USD forks and a quality monoshock offer good suspension travel and ride comfort on rough terrain. High Ground Clearance: Good off-road capability thanks to its significant ground clearance (around 200 mm). Off-Road-Friendly Braking: Supermoto ABS mode lets you lock the rear wheel slightly — helpful on dirt or gravel. Long Range for Touring: A reasonably large fuel tank combined with good fuel efficiency enables long-distance road trips. Comfortable Ergonomics: Upright seating, tall handlebars, and good seat height make it comfortable for long rides and standing on trails. Strong Build Quality: Solid trellis frame and quality components make the bike robust and durable for adventure use. |
| Transmission | Manual | 6 Speed Manual |
