Back to Bike FinderYears: 2024 · 2023 · 2022 · 2021 · 2020 · 2019 · 2018 · 2017 · 2016 · 2015 · 2014 · 2013 · 2012 · 2011 · 2010 · 2009 · 2008 · 2007 · 2006 · 2005 · 2004 · 2003
KTM 125 SX
2013Off-road

KTM 125 SX

Key specifications

Engine
125 cc
Weight
91 kg
Fuel type
petrol
Fuel capacity
2.0 L
Transmission
6-speed
Seat height
39 mm
Front brakes
Single disc. Four-piston calipers.
Rear brakes
Single disc. Two-piston calipers.

Overview

Introducing the 2013 KTM 125 SX, a motorcycle that embodies the spirit of competitive motocross while catering to both novice and experienced riders. Renowned for its agile handling and robust performance, this lightweight cross-motocross machine is designed to tackle the toughest terrains with ease. As a part of KTM's celebrated SX line, the 125 SX stands out as an excellent entry point into the world of two-stroke racing, offering riders the perfect blend of power, finesse, and reliability. At the heart of the 125 SX lies a potent 124.80 ccm single-cylinder, two-stroke engine that delivers exhilarating performance. With a carefully optimized bore and stroke of 54.0 x 54.5 mm, this engine provides an impressive power-to-weight ratio that translates into rapid acceleration and responsive throttle control. The fully electronic ignition system ensures precise timing adjustments, maximizing power output while maintaining smooth operation. Coupled with a 6-speed gearbox and a wet multi-disc clutch, riders can seamlessly shift gears to conquer challenging tracks. The liquid cooling system keeps the engine at optimal temperatures, allowing for sustained performance even during intense rides. KTM has packed the 125 SX with features that enhance both performance and rider comfort. Its central tube frame, constructed from chrome molybdenum steel, provides unparalleled rigidity and strength while keeping overall weight to just 90.8 kg (200.2 pounds). The WP Suspension, featuring an Up Side Down front fork and a refined rear shock, ensures that the bike handles rough terrain with confidence, offering 205 mm of front travel and 185 mm of rear travel. The braking system, equipped with powerful single discs and four-piston calipers at the front, guarantees precise stopping power, allowing riders to maintain control in any situation. With a ground clearance of 395 mm and an adjustable seat height of 992 mm, the 125 SX caters to a wide range of rider preferences. **

Pros

  • Lightweight and Agile: At just 200.2 pounds, the 125 SX is easy to maneuver, making it perfect for both beginners and seasoned riders looking for nimble handling.
  • Powerful Two-Stroke Engine: The responsive single-cylinder engine delivers thrilling acceleration and performance, making it a blast on the track or trails.
  • High-Quality Suspension: With top-notch WP suspension components, riders can expect excellent handling and comfort, even on the roughest of terrains.

Cons

  • Limited Fuel Capacity: The 7.50-litre fuel tank may require more frequent stops during longer rides or races, which can be a hassle for competitive riders.
  • Kickstarter Only: While the traditional kickstarter provides a classic touch, it may be less convenient for some riders compared to electric start options available on other models.
  • Height Considerations: With a seat height of 992 mm, shorter riders may find it challenging to reach the ground comfortably, potentially impacting their confidence when stopping.

Technical details

Source specification data

Make
KTM
Model
125 SX
Category
Cross-motocross
Starter
Kick
Color Options
Orange/Black
Clutch
Wet multi-disc clutch / hydraulically operated
Gearbox
6-speed
Ignition
Contactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
Driveline
13:50. Primary drive: 23:73.
Engine Type
Reed intake.
Bore X Stroke
54.0 x 54.5 mm (2.1 x 2.1 inches)
Displacement
124.80 ccm (7.62 cubic inches)
Cooling System
Liquid
Engine Details
Single cylinder, two-stroke
Transmission Type Final Drive
Chain
Dry Weight
90.8 kg (200.2 pounds)
Seat Height
992 mm (39.1 inches) If adjustable, lowest setting.
Fuel Capacity
7.50 litres (1.98 gallons)
Ground Clearance
395 mm (15.6 inches)
Rake
26.5°
Frame Type
Central tube frame made of chrome molybdenum steel tubing
Rear Brakes
Single disc. Two-piston calipers.
Front Brakes
Single disc. Four-piston calipers.
Rear Suspension
WP  Suspension 5018 BAVP DCC
Front Suspension
WP  Suspension Up Side Down 4860 MXMA CC
Rear Wheel Travel
185 mm (7.3 inches)
Front Wheel Travel
205 mm (8.1 inches)
Rear Brakes Diameter
210 mm (8.3 inches)
Front Brakes Diameter
220 mm (8.7 inches)

Available colors

Orange/Black