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KTM 50 SX
2019Off-road

KTM 50 SX

Key specifications

Engine
49 cc
Weight
42 kg
Fuel type
petrol
Fuel capacity
0.6 L
Transmission
1-speed
Seat height
27 mm
Front brakes
Single disc. Four-piston calipers.
Rear brakes
Single disc. Two-piston calipers.

Overview

Introducing the 2019 KTM 50 SX, a lightweight powerhouse designed specifically for aspiring young motocross racers. As a leading name in the world of off-road motorcycles, KTM has crafted the 50 SX to deliver an exhilarating riding experience, making it the perfect entry point for kids eager to dominate the dirt. With its vibrant orange, white, and black color scheme, this bike not only looks the part but also embodies the spirit of competition that KTM is renowned for. Positioned in the cross-motocross category, the 50 SX is engineered for those who are serious about honing their skills on the track. At the heart of the KTM 50 SX is a robust 49cc single-cylinder two-stroke engine that promises impressive performance for its size. The engine features a bore and stroke of 39.5 x 40.0 mm, ensuring a responsive throttle that will delight both novice and experienced young riders alike. The Mikuni TMX carburettor optimizes fuel delivery, while the liquid cooling system maintains performance consistency even during intense riding sessions. With a user-friendly 1-speed gearbox equipped with a centrifugal clutch, young riders can focus on mastering their technique without the added complexity of manual shifting. For added convenience, the power output can be restricted to 5.5 horsepower, allowing for gradual skill development as riders grow more confident. The 2019 KTM 50 SX is built with a sturdy yet lightweight central-tube frame that enhances agility, making it easy for riders to maneuver through tight corners and challenging terrains. The WP upside-down front suspension, offering 205 mm of travel, absorbs bumps and ensures a smooth ride, while the rear suspension provides an additional 185 mm of travel for optimal control. Safety is also a priority, as evidenced by the reliable braking system featuring 160 mm single discs with four-piston calipers in the front and two-piston calipers in the rear. The bike's compact dimensions, including a seat height of 684 mm (at its lowest setting) and a ground clearance of 252 mm, make it accessible for younger riders, empowering them to build confidence on two wheels. **

Pros

  • Lightweight & Agile: Weighing in at just 41.5 kg (91.5 lbs), the 50 SX is easy to handle, allowing young riders to explore their limits.
  • User-Friendly Power Delivery: The centrifugal clutch and 1-speed gearbox simplify operation, making it ideal for beginners learning to ride.
  • High-Quality Suspension: The WP suspension components provide excellent handling and comfort over rough terrain, enhancing the overall riding experience.

Cons

  • Limited Power Output: While the restrictable engine is great for beginners, more experienced riders may find the power underwhelming.
  • Small Fuel Capacity: At just 2.30 litres (0.61 gallons), the fuel tank may require frequent refueling during longer riding sessions.
  • Kick Start Only: The absence of an electric start might be a hurdle for some young riders who may struggle with the kick-start mechanism.

Technical details

Source specification data

Make
KTM
Model
50 SX
Category
Cross-motocross
Starter
Kick
Comments
The engine power can be restricted to 5.5 hp with a kit.
Color Options
Orange/white/black
Clutch
Centrifugal clutch
Gearbox
1-speed
Ignition
Seletra 2p D36
Engine Type
Reed intake
Fuel System
Carburettor. Mikuni TMX
Bore X Stroke
39.5 x 40.0 mm (1.6 x 1.6 inches)
Displacement
49.00 ccm (2.99 cubic inches)
Cooling System
Liquid
Engine Details
Single cylinder, two-stroke
Lubrication System
Mixture oil lubrication
Transmission Type Final Drive
Chain
Dry Weight
41.5 kg (91.5 pounds)
Seat Height
684 mm (26.9 inches) If adjustable, lowest setting.
Fuel Capacity
2.30 litres (0.61 gallons)
Ground Clearance
252 mm (9.9 inches)
Rake
24.0°
Wheels
Wire spoked
Frame Type
Central-tube frame with double-cradle
Rear Brakes
Single disc. Two-piston calipers.
Front Brakes
Single disc. Four-piston calipers.
Rear Suspension
WP shock absorber
Front Suspension
WP upside-down Ø 35 mm
Rear Wheel Travel
185 mm (7.3 inches)
Front Wheel Travel
205 mm (8.1 inches)
Rear Brakes Diameter
160 mm (6.3 inches)
Front Brakes Diameter
160 mm (6.3 inches)

Available colors

Orange/white/black