Quick Analysis
Bajaj Pulsar NS125
30.5 pts
Unweighted: 23 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
KTM 50 SX
7.5 pts
Unweighted: 4 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | Air cooled | — |
| Displacement | 124.45 cc | 49.9 cc |
| Engine Type | 4-Stroke, SOHC 4-Valve, Air Cooled, BSVI Compliant DTS-i Ei Engine | 1-cylinder, 2-stroke engine |
| Power | 11.8 bhp @ 8500 rpm | 5.3 bhp @ 11500 rpm |
| Torque | 11 Nm @ 7000 rpm | 5.2 Nm @ 7500 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 12 L | 2.3 L |
| Mileage | 50 kmpl | 30 kmpl |
Dimensions & Weight |
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| Kerb Weight | 145 | 41 kg |
| Seat Height | 805 | 653 mm |
Brakes & Suspension |
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| ABS | Single channel ABS with 3 ABS ride modes | — |
| Front Brake | 240 mm (CBS/CBS premium) and 260 mm (ABS) front disc | Disc 160 mm |
| Front Suspension | Telescopic | XACT 35 WP Upside-Down fork, Ø 35 mm |
| Rear Brake | 130 mm Drum CBS | Disc 160 mm |
| Rear Suspension | Monoshock | XACT WP mono shock |
Tyres & Wheels |
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| Front Tyre | 90/90 - 17 | 60/100 - 12 |
| Rear Tyre | 120/80 - 17 | 2.75 - 10 |
| Tyre Type | Tubeless | Tubed |
| Wheel Type | Alloy | Spoke |
Features & Technology |
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| Headlight | Halogen Headlamp | — |
Other Specifications |
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| Battery | 12V, 4Ah | — |
| Bike Image 1 | https://motoautiv.com/wp-content/uploads/2026/03/blue-1.avif | — |
| Bike Image 2 | https://motoautiv.com/wp-content/uploads/2026/03/red-1.avif | — |
| Bike Image 3 | https://motoautiv.com/wp-content/uploads/2026/03/peal-mettalic-white-1.avif | — |
| Bike Image 4 | https://motoautiv.com/wp-content/uploads/2026/03/pewter-grey-3.avif | — |
| Bike Image 5 | https://motoautiv.com/wp-content/uploads/2026/03/orange-1.avif | — |
| Color Options | Burnt Black | #1C1C1C Beach Blue | #4A7FA0 Burnt Red | #8B1A1A Pearl Mettalic white | #E8E8E6 Pewter Grey | #6E6E6E Fiery Orange | #F05A28 | Electronic Orange |
| Cons | Not as refined as competitors Air-cooled engine limitation Stiff braking | 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. |
| Detailed Overview | The Bajaj Pulsar NS125 is built as a smaller-capacity motorcycle within the NS (Naked Sport) lineup, combining a compact engine with a perimeter frame and design elements inspired by larger Pulsar models. At its core, the motorcycle is powered by a 124.45 cc single-cylinder, air-cooled engine that uses a 4-valve SOHC configuration and fuel injection to manage combustion. This engine produces around 12 PS of power at 8500 rpm and 11 Nm of torque at 7000 rpm, figures that are broadly in line with other motorcycles in the 125cc segment. The engine is paired with a 5-speed manual gearbox, which allows the rider to shift through gears depending on speed and riding conditions. Power is delivered to the rear wheel via a chain drive system, a common setup in motorcycles of this category. The overall powertrain is designed to provide a mix of usable power and efficiency for everyday riding scenarios. The NS125 is built on a perimeter frame, a structure that surrounds the engine and distributes loads around it during cornering and regular riding. This type of frame is derived from larger NS models. Suspension duties are handled by telescopic front forks and a rear monoshock suspension, which work together to absorb road irregularities such as bumps and uneven surfaces. For braking, the motorcycle features a front disc brake and a rear drum brake, supported by a combined braking system (CBS). In some variants, a single-channel ABS setup is also available, depending on the configuration. The braking system is designed to distribute stopping force between the wheels to maintain balance during deceleration. The bike rides on 17-inch alloy wheels fitted with tubeless tyres, which are commonly used for road grip and ease of maintenance. This wheel setup contributes to maneuverability and stability in both city traffic and open roads. In terms of dimensions, the Pulsar NS125 has a fuel tank capacity of 12 litres, providing a riding range between refueling stops that depends on fuel consumption and riding conditions. The motorcycle has a kerb weight of around 145 kg and a seat height of approximately 805 mm. Ground clearance is around 178 mm, intended to provide clearance over uneven road surfaces and speed breakers. The instrument cluster on the NS125 is typically a semi-digital console, combining an analog tachometer with a digital display for speed, fuel level, and trip information. Some variants also include Bluetooth connectivity features, offering additional ride data and navigation-related functions through a connected device. Lighting components include a halogen or LED headlamp setup depending on variant, and an LED tail lamp, along with design elements such as the wolf-eyed headlamp styling and split grab rails. | 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. |
| Expert Review | The Bajaj Pulsar NS125 occupies an interesting position in the 125cc segment - it borrows the perimeter frame, monoshock rear suspension, and streetfighter styling from its larger NS siblings, which gives it a hardware advantage that most competitors at this price point simply cannot match on paper. In real-world city riding, the 124.45cc air-cooled engine delivers adequate performance for stop-and-go traffic and college commutes, though it begins to show its limitations above 80 km/h where vibrations become noticeable through the handlebar and footpegs. The claimed ARAI efficiency of 56+ km/l is optimistic, most owners report figures closer to 34–45 km/l under mixed riding conditions, which is decent but not exceptional for a 125cc motorcycle. The addition of single-channel ABS on the top variant is a genuinely meaningful safety feature for the segment, though the base and mid variants still make do with CBS, and the rear drum brake across all variants feels like a cost compromise that affects overall braking confidence. Build quality and finish are adequate for the price but fall short of what the sporty design aesthetic suggests, plastics feel thin in places and panel gaps are inconsistent on some units. At roughly ₹93,000–₹1,02,000 ex-showroom, the NS125 is reasonably positioned, but buyers willing to stretch their budget slightly will find the NS160 a considerably more complete motorcycle in terms of performance and refinement., 3.2, MotoAutiv Team | MotoAutiv Team |
| FAQ (Manual Override) | Q: What mileage can I expect from the NS125? A: The bike is reported to deliver around 45–55 km/l, depending on riding conditions, maintenance, and usage. Q: Is the NS125 good for daily commuting? A: Yes, it is generally considered suitable for daily commuting, due to its manageable power, relatively lightweight feel, and fuel efficiency. Q: Is the NS125 comfortable for long rides? A: It can handle short to medium rides comfortably, but for longer highway rides, higher-capacity motorcycles may offer more relaxed cruising ability. Q: What type of engine does the NS125 use? A: The NS125 uses a single-cylinder, air-cooled, fuel-injected engine, which is a straightforward setup compared to liquid-cooled engines found in higher-capacity NS models. | 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 |
| Fuel System | Electronic Fuel injection | — |
| Price Variants | Standard | 92760 | Disc Brakes, Alloy Wheels, CBS, Halogen headlamp LED Bluetooth | 97409 | Disc Brakes, Alloy Wheels, CBS, LED headlamp LED Bluetooth - ABS | 102111 | Disc Brakes, Alloy Wheels, Single channel ABS, LED headlamp | | 475000 |
| Pros | Sporty NS design and road presence Good performance for daily use Fuel-efficient engine Comfortable and easy to handle Value-for-money positioning | 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. |
| Starter | Kick and Self Start | — |
| Transmission | 5 speed manual | Manual |
