MotoSpecs

2017 KTM 125 SX Specifications

Cross / motocross

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2017 KTM 125 SX Overview

The 2017 KTM 125 SX is a cross / motocross motorcycle built around 124.80 cc of displacement. Under the tank sits a Single cylinder, two-stroke engine. The bore and stroke measures 54 x 54.5 mm. From a practical standpoint, the 2017 125 SX tips the scales at 87.2 kg, carries a 7-litre fuel tank, offers a seat height of 960 mm and spans a 1,485 mm wheelbase. Scroll down for the complete 2017 KTM 125 SX spec sheet covering every technical detail from suspension travel to tyre sizes.

2017 125 SX - Pros & Cons

Strengths

  • Factory engineering: The 2017 KTM 125 SX represents KTM's engineering at the time, with a specification built around real-world usability.

Considerations

  • Carburetor fuelling: Carbureted engines need occasional jetting attention and can be reluctant in cold weather or at altitude compared to modern fuel-injected alternatives.
  • Tall seat height: The 960 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.

Owner Experiences & Common Issues

Carburetor maintenance

Carburetors on the 2017 KTM 125 SX benefit from a clean and re-jet if the bike has been stored, run on stale fuel, or modified with an aftermarket exhaust. Owners frequently mention that fresh jets and float needle clips transforms throttle response from flat to crisp.

125 SX - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2017 KTM 125 SX, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained 125 SX should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task on any 125 SX. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.

Carburetor upkeep

Keep the carburetors clean and free of deposits. If the 125 SX has been stored, strip and clean the carb float bowls before attempting to start it. Pilot jets are the first to block and the last to be checked - always include them in any carb rebuild.

2017 KTM 125 SX - Frequently Asked Questions

What engine does the 2017 KTM 125 SX have?
The 2017 KTM 125 SX uses a Single cylinder, two-stroke engine with 124.80 cc of displacement.
How much does the 2017 KTM 125 SX weigh?
The 2017 KTM 125 SX weighs 87.2 kg. This is the manufacturer's dry figure.
What is the fuel tank capacity of the 2017 KTM 125 SX?
The 2017 KTM 125 SX has a 7-litre fuel tank.
Is the 2017 KTM 125 SX suitable for shorter riders?
The 2017 KTM 125 SX has a seat height of 960 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2017 KTM 125 SX have?
The 2017 KTM 125 SX uses Single disc. Brake calipers on floating bearings at the front and Single disc. Brake calipers on floating bearings at the rear.
What fuel system does the 2017 KTM 125 SX use?
The 2017 KTM 125 SX uses Carburettor. Mikuni TMX, providing precise fuelling across the rev range and reliable cold-start behaviour.
What suspension does the 2017 KTM 125 SX have?
The 2017 KTM 125 SX uses WP-USD, AER 48, ? 48 mm up front and WP shock absorber with linkage at the rear.

KTM 125 SX Spec Evolution

The KTM 125 SX was produced across 21 model years (2003-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Wet Weight - - - - - - - - 104.0 kg / 229.3 lbs 292.1 kg / 643.9 lbs - 112.0 kg / 246.9 lbs - - - - - - - - -
Dry Weight 93.6 kg / 206.4 lbs 93.6 kg / 206.4 lbs 92.4 kg / 203.7 lbs 92.4 kg / 203.7 lbs 92.4 kg / 203.7 lbs 90.8 kg / 200.2 lbs 90.8 kg / 200.2 lbs 90.8 kg / 200.2 lbs 88.8 kg / 195.8 lbs 91.6 kg / 201.9 lbs 90.8 kg / 200.2 lbs 90.8 kg / 200.2 lbs 90.8 kg / 200.2 lbs 87.8 kg / 193.6 lbs 87.2 kg / 192.2 lbs 87.2 kg / 192.2 lbs 87.5 kg / 192.9 lbs 137 kg / 302.0 lbs 87.5 kg / 192.9 lbs 87.5 kg / 192.9 lbs 92.4 kg / 203.7 lbs
Engine Detail - - - - - - - - - Reed intake and exhaust control Reed intake. Reed intake. Reed intake. Reed intake. Reed intake. Reed intake. Reed intake. - - - -
Engine Type Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke
Seat Height 925 mm / 36.4 in. 925 mm / 36.4 in. 925 mm / 36.4 in. 925 mm / 36.4 in. 925 mm / 36.4 in. 960 mm / 37.8 in. 985 mm / 38.8 in. 985 mm / 38.8 in. 992 mm / 39.1 in. 992 mm / 39.1 in. 992 mm / 39.1 in. 992 mm / 39.1 in. 992 mm / 39.1 in. 960 mm / 37.8 in. 960 mm / 37.8 in. 960 mm / 37.8 in. 950 mm / 37.4 in. - 850 mm / 33.5 in. 950 mm / 37.4 in. 958 mm / 37.7 in.
Fuel Capacity 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 8.00 litres / 2.11 gallons 8.00 litres / 2.11 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.50 litres / 1.98 gallons 7.00 litres / 1.85 gallons 7.00 litres / 1.85 gallons 7.00 litres / 1.85 gallons 7.50 litres / 1.98 US gallons - 7.50 litres / 1.98 US gallons 7.50 litres / 1.98 US gallons 7.20 litres / 1.90 US gallons
Stroke 2 2 2 2 2 2 2 - - - - - - - - - - - - - 2-stroke
Ground Clearance (mm) 390 mm 390 mm 390 mm 390 mm 390 mm 390 mm 390 mm 390 mm 385 mm 395 mm 395 mm 395 mm 395 mm 375 mm 375 mm 375 mm 375 mm - 375 mm 375 mm 359 mm

Key Specifications

Engine

Single cylinder, two-stroke

Power

N/A

Torque

N/A

Top Speed

N/A

Weight

87.2 kg / 192.2 lbs

Fuel Capacity

7.00 litres / 1.85 gallons

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Full 2017 KTM 125 SX Specifications

Colours Orange/white/black
Bore x Stroke (in,) 2.1 x 2.1 inches
Bore x Stroke (mm) 54.0 x 54.5 mm
Displacement (cc) 124.80 cc
Displacement (ci) 7.62 cubic inches
Engine Type Single cylinder, two-stroke
Engine Detail Reed intake.
Fuel System Carburettor. Mikuni TMX
Ignition Kokusan EMS
Starter Kick
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