Quick Analysis
KTM 50 SX
9.5 pts
Unweighted: 6 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
Aprilia Storm 125
25.5 pts
Unweighted: 18 advantages
EnginePerformanceDimensionsBrakesTyresFeaturesOther
| Specification | ||
|---|---|---|
Engine Specifications |
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| Cooling System | — | Air‑cooled |
| Displacement | 49.9 cc | 124.45 cc |
| Engine Type | 1-cylinder, 2-stroke engine | Single‑cylinder, 4‑stroke, air‑cooled, 3‑valve |
| Power | 5.3 bhp @ 11500 rpm | 9.92 PS @ 7700 rpm |
| Torque | 5.2 Nm @ 7500 rpm | 9.7 Nm @ 6000 rpm |
Performance & Efficiency |
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| Fuel Tank Capacity | 2.3 L | 6.5 l |
| Mileage | 30 kmpl | 40 kmpl |
Dimensions & Weight |
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| Kerb Weight | 41 kg | 118 |
| Seat Height | 653 mm | 780 mm |
Brakes & Suspension |
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| Front Brake | Disc 160 mm | Disc brake (220 mm) |
| Front Suspension | XACT 35 WP Upside-Down fork, Ø 35 mm | Hydraulic double-telescopic fork |
| Rear Brake | Disc 160 mm | Drum brake (140 mm) |
| Rear Suspension | XACT WP mono shock | Hydraulic shock |
Tyres & Wheels |
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| Front Tyre | 60/100 - 12 | 120/80‑12 |
| Rear Tyre | 2.75 - 10 | 130/80‑12 |
| Tyre Type | Tubed | Tubeless |
| Wheel Type | Spoke | Alloy |
Features & Technology |
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| Headlight | — | LED |
Other Specifications |
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| Battery | — | 12 V / 5 Ah |
| Bike Image 1 | — | https://motoautiv.com/wp-content/uploads/2025/12/sr_storm_yellow-scaled.webp |
| Cluster | — | Analogue + digital console |
| Color Options | Electronic Orange | Matte Red |#e3292f Matte Yellow|#ffff00 |
| 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. | The seat is firm and compact, which can feel less comfortable on longer rides or with a pillion. The suspension is firm, so rough or pothole-laden roads transmit more bumps to the rider. Fuel tank capacity is modest at 6.5 litres, limiting range for longer trips. Storage space is limited, restricting the ability to carry larger items or full-face helmets comfortably. Being a smaller-displacement scooter, highway cruising is limited, and top speeds are moderate. |
| 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 Aprilia SR Storm 125 gives you a sense of having a sporty, nimble scooter beneath you — its heart is a 124.49 cc, air‑cooled, single‑cylinder engine with a 3‑valve head and fuel injection. That sounds modest, but in the context of urban and everyday commuting it’s tuned to deliver consistent, usable performance. With about 9.92 PS of power at 7,700 rpm and 9.7 Nm of torque at 6,000 rpm, the Storm 125 doesn’t offer wild acceleration, but it provides smooth, predictable acceleration that’s more than enough to dart through city traffic or handle daily errands without fuss. The automatic CVT + belt‑drive means you don’t need to worry about shifting — just twist and go, which is ideal for traffic, frequent stops or unpredictable stop‑and‑go conditions. Underneath, the Storm rides on a tubular steel frame, supported up front by a telescopic fork (with a 30 mm inner tube) and at the rear by a mono‑shock absorber. The wheels are 12‑inch alloys, wrapped with tubeless tyres — 120/80‑12 at the front and 130/80‑12 at the rear. That combination gives the scooter a compact footprint, making it easier to weave through traffic or negotiate narrow lanes. The smaller wheels and higher‑profile tyres help soften the ride over potholes or rough stretches compared with low‑profile tyres: while it won’t ride like a large cruiser, the Storm feels more forgiving over broken or uneven roads than a typical performance‑oriented small scooter might. Braking is handled via a 220 mm disc at the front and a 140 mm drum at the rear, with a Combined Braking System (CBS) to help distribute braking force — which means braking is stable and weighted rather than sudden, useful in city conditions or when a quick stop is needed. That front disc gives enough bite for confident stopping without fuss. In terms of size, the Storm stretches about 1,985 mm in length, with a wheelbase of 1,365 mm — compact enough to feel agile but long enough to give reasonable stability. Seat height sits at about 780 mm, which tends to be manageable for most riders, making stops or mounting/dismounting easier in day‑to‑day use. The kerb weight is roughly 118 kg: light enough to manoeuvre easily in tight traffic, yet with enough heft to stay planted at moderate speeds or on uneven surfaces. A 6.5‑litre fuel tank sits under the fuel cap. That size isn’t huge, but paired with the modest engine and decent fuel efficiency (official figures suggest around 38–40 km/l — real‑world numbers will vary with riding style), it offers a practical range for daily commuting, errands, or short-to-medium rides before needing a refill. On the features front, Storm 125 doesn’t try to be flashy — it keeps things practical. You get a simple analogue + digital instrument cluster that shows speed, fuel level, trip info, etc. The headlight and tail/indicator lighting are LED (or partially LED, depending on the variant), which helps with visibility. There’s under‑seat storage, a passenger footrest, a low‑fuel warning lamp, and a USB charging port in some variants — helpful touches if you use the scooter for errands, short trips, or commuting with a phone/GPS in tow. Starting is achieved via kick as well as electric self‑start — handy for reliability or if the battery is low. What this all adds up to in real life is a scooter that’s built to be practical, economical, and easy to live with — but with a twist of sportiness and style. The Storm 125 doesn’t try to pretend it’s a high‑power motorcycle; rather, it leans into being a user-friendly, agile, and fairly efficient daily rider with a more aggressive look and feel than a basic commuter. It is especially suited for those who navigate busy city streets, need easy parking and manoeuvrability, and want a scooter that’s simple to ride, easy to maintain, and functional for everyday needs — but with a bit more character than a plain‑Jane scooter. |
| Expert Review | MotoAutiv Team | Aprilia Storm 125 has rugged, sporty design and gives confident handling, but is frequently criticized for its stiff suspension, lack of modern features (like LED lights and digital tech) by the users., 4, 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 type? A: The engine is a single-cylinder, 4-stroke, air-cooled, 3-valve unit. Q: What is the engine displacement? A: The displacement is 124.49 cc. Q: What is the power output? A: The power output is approximately 9.92 PS at 7700 rpm. Q: What is the torque? A: The torque is about 9.7 Nm at 6000 rpm. Q: What is the mileage? A: The mileage is around 38–40 km/l depending on riding conditions. Q: What type of cooling system does it have? A: It has an air-cooled system. Q: What type of transmission does it use? A: The scooter comes with an automatic CVT. Q: What type of fuel system does it have? A: It uses fuel injection with petrol. Q: What are the front and rear brakes? A: The front brake is a 220 mm disc, and the rear brake is a 140 mm drum. Q: Does it have ABS? A: It has a Combined Braking System (CBS), not ABS. Q: What is the front suspension? A: The front suspension is a hydraulic telescopic fork. Q: What is the rear suspension? A: The rear suspension is a hydraulic shock absorber. Q: What are the tyre sizes? A: The front tyre is 120/80-12, and the rear tyre is 130/80-12, both tubeless. Q: What type of wheels does it have? A: The scooter has 12-inch alloy wheels. Q: What is the kerb weight? A: The kerb weight is approximately 118 kg. Q: What is the seat height? A: The seat height is 780 mm. Q: What is the fuel tank capacity? A: The fuel tank capacity is 6.5 litres. Q: What type of headlight does it have? A: The scooter comes with LED headlight and LED tail/indicator lights. Q: What type of starter does it have? A: It has both electric and kick start. Q: What type of instrument cluster does it have? A: It has a combined analogue and digital console displaying speed, fuel level, trip meter, and low-fuel warning. Q: Is the Aprilia SR Storm 125 suitable for city commuting? A: Yes, its compact size, light weight, automatic transmission, and agile handling make it ideal for urban traffic. Q: Does it have under-seat storage? A: Yes, there is under-seat storage suitable for small items or a helmet. |
| Fuel System | — | Petrol, fuel‑injected |
| Price Variants | | 475000 | | 112869 |
| 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 Storm 125 has nimble and agile handling, making it easy to weave through city traffic and park in tight spaces. Its sporty and aggressive design stands out, giving it a premium, performance-oriented look compared with regular scooters. The engine delivers smooth, usable performance, with enough punch for urban commuting and occasional highway bursts. Front disc and rear drum brakes with CBS provide reliable stopping power and enhance rider confidence. Automatic CVT transmission makes it very easy to ride in stop-and-go traffic without the hassle of manual gear changes. LED lighting and combined analogue-digital cluster improve visibility and modernize the riding experience. Lightweight (118 kg) and compact dimensions make the scooter easy to maneuver, even for newer riders. |
| Starter | — | Kick + Electric self‑start |
| Transmission | Manual | Automatic |
