2013 KTM 50 SX Specifications

Name: 2013 KTM 50 SX
Brand: KTM

No images available

Tap to enlarge

2013 KTM 50 SX Overview

The 2013 KTM 50 SX is a cross / motocross motorcycle built around 49 cc of displacement. Under the tank sits a Single cylinder, two-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 10.6:1. The bore and stroke measures 39.5 x 40 mm. 2013 KTM 50 SX delivers 9.20 Nm @ 7000 Revolutions of torque. From a practical standpoint, the 2013 50 SX tips the scales at 41.5 kg, carries a 2.30-litre fuel tank, offers a seat height of 684 mm and spans a 1,032 mm wheelbase. Scroll down for the complete 2013 KTM 50 SX spec sheet covering every technical detail from suspension travel to tyre sizes.

2013 50 SX - Pros & Cons

Strengths

Accessible seat height: At 684 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.

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.

Owner Experiences & Common Issues

Carburetor maintenance

Carburetors on the 2013 KTM 50 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.

Valve clearance checks

Single Overhead Cams (SOHC) engines should have valve clearances checked at the manufacturer's specified interval. Owners report that clearances can tighten over time on higher-mileage bikes, leading to slight ticking from the top end. Catching it early keeps the job simple and avoids more costly remediation.

50 SX - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2013 KTM 50 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 50 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 50 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 50 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.

Valve clearance service

Check that valve clearances have been adjusted at the correct intervals on any used 50 SX. This is a job many owners skip because the bike does not immediately feel wrong - but tight clearances accelerate valve seat wear. Ask for proof it has been done.

2013 KTM 50 SX - Frequently Asked Questions

What engine does the 2013 KTM 50 SX have?

The 2013 KTM 50 SX uses a Single cylinder, two-stroke engine with 49 cc of displacement.

How much does the 2013 KTM 50 SX weigh?

The 2013 KTM 50 SX weighs 41.5 kg. This is the manufacturer's dry figure.

How much power does the 2013 KTM 50 SX make?

The 2013 KTM 50 SX produces 9.20 Nm @ 7000 Revolutions of torque.

What is the fuel tank capacity of the 2013 KTM 50 SX?

The 2013 KTM 50 SX has a 2.30-litre fuel tank.

Is the 2013 KTM 50 SX suitable for shorter riders?

The 2013 KTM 50 SX has a seat height of 684 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2013 KTM 50 SX have?

The 2013 KTM 50 SX uses Single disc. Four-piston calipers. at the front and Single disc. Two-piston calipers. at the rear.

What tyre sizes does the 2013 KTM 50 SX use?

The 2013 KTM 50 SX runs 100/80-17 front and 110/80-17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

KTM 50 SX Spec Evolution

The KTM 50 SX was produced across 17 model years (2006-2023). 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	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2021	2022	2023
Wet Weight	-	-	-	-	-	104.0 kg / 229.3 lbs	-	-	112.0 kg / 246.9 lbs	-	-	-	-	-	-	-	-
Dry Weight	38.8 kg / 85.5 lbs	38.8 kg / 85.5 lbs	38.8 kg / 85.5 lbs	39.8 kg / 87.7 lbs	39.8 kg / 87.7 lbs	39.8 kg / 87.7 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	39.8 kg / 87.7 lbs	39.8 kg / 87.7 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs	41.5 kg / 91.5 lbs
Engine Detail	-	-	-	-	-	-	Reed intake	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, 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	650 mm / 25.6 in.	650 mm / 25.6 in.	660 mm / 26.0 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	684 mm / 26.9 in.	665 mm / 26.2 in.	665 mm / 26.2 in.
Fuel Capacity	1.80 litres / 0.48 gallons	1.80 litres / 0.48 gallons	1.80 litres / 0.48 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 gallons	2.30 litres / 0.61 US gallons	2.30 litres / 0.61 US gallons	2.30 litres / 0.61 US gallons	2.30 litres / 0.61 US gallons
Stroke	2	2	2	2	-	-	-	-	-	-	-	-	-	-	-	-	2-stroke
Ground Clearance (mm)	255 mm	255 mm	255 mm	255 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm	252 mm

Key Specifications

Engine

Single cylinder, two-stroke

Power

N/A

Torque

9.20 Nm (0.9 kgf-m or 6.8 ft.lbs) @ 7000 Revolutions

Top Speed

N/A

Weight

41.5 kg / 91.5 lbs

Fuel Capacity

2.30 litres / 0.61 gallons

Full 2013 KTM 50 SX Specifications

Colours Orange/black

Max Torque 9.20 Nm (0.9 kgf-m or 6.8 ft.lbs) @ 7000 Revolutions

Power-to-Weight Ratio 0.0815 HP/kg

Fuel Control Single Overhead Cams (SOHC)

Engine Type Single cylinder, two-stroke

Displacement (ci) 2.99 cubic inches

Displacement (cc) 49.00 cc

Bore x Stroke (mm) 39.5 x 40.0 mm

Bore x Stroke (in,) 1.6 x 1.6 inches

Engine Detail Reed intake.

Fuel System Carburettor

Compression Ratio 10.6:1

Engine Lubrication Mixture oil lubrication

Ignition SELETTRA 2p D36

Starter Kick

Valve System 2

Compare KTM 50 SX

See how the 2013 KTM 50 SX stacks up against similar motorcycles.

2013 KTM 50 SX

vs 2010 Honda CRF50F

Build your own comparison →

All KTM models Cross / motocross Compare bikes