KTM 50 SX 2012 User Manual (English)

Other manuals for KTM 50 SX 2012

Questions and Answers:

A
Allison BakerJul 26, 2025
Why KTM 50 SX 2012 engine turns but won't start?
- J
  Jennifer MunozJul 26, 2025
  If your KTM Motorcycle engine turns but won't start, there might be several reasons. It could be due to an operating error, old fuel in the float chamber (if the motorcycle was out of use for a long time), or an interrupted fuel feed. The spark plug might be oily or wet, or the electrode distance (plug gap) of the spark plug could be too wide. Another potential cause is a loose or oxidized connector or ignition coil.
V
villanuevatheodoreAug 5, 2025
What to do if my KTM Motorcycle engine turns but does not start?
- M
  Martha LarsonAug 5, 2025
  If your KTM Motorcycle engine turns over but doesn't start, several factors could be at play. It could be due to an operating error during the starting procedure. Old fuel in the float chamber can also be a culprit if the motorcycle has been sitting unused for a while. Check if the fuel feed is interrupted, or if the spark plug is oily or wet. Also, the electrode distance of the spark plug may be too wide, or the connector/ignition coil might be loose or oxidized. Clean and dry the spark plug, and adjust the plug gap to 0.60 mm (0.0236 in). Clean the plug-in connection and treat it with contact spray.
D
Dustin SanfordAug 15, 2025
How to troubleshoot a KTM 50 SX 2012 when the engine turns but does not start?
- C
  Cody CruzAug 16, 2025
  To troubleshoot a KTM Motorcycle engine that turns but doesn't start, consider these steps: Check for any operating errors during start-up. If the motorcycle has been out of use, the fuel in the float chamber might be old. Inspect the fuel feed for any interruptions. Examine the spark plug to see if it's oily or wet. Ensure the spark plug electrode gap is correctly adjusted to 0.60 mm (0.0236 in). Also, verify that the connector and ignition coil are clean and properly connected; use contact spray if necessary.

KTM 50 SX 2012 Specifications

General

Brand	KTM
Model	50 SX 2012
Category	Motorcycle
Language	English

Summary

2 Safety Advice

2.2 Safety Advice

Provides general safety instructions for operating the vehicle safely.

2.3 Degrees of Risk and Symbols

Explains risk symbols and their meanings for warnings and dangers.

2.5 Safe Operation

Provides advice on safe operation, including avoiding impairment and dangers of exhaust gases.

2.6 Protective Clothing

Emphasizes wearing protective clothing for safety and risk of injury.

3 Important Information

3.4 Service

Emphasizes proper service, care, and tuning for optimal operation and longevity.

6 Controls

6.4 Opening Filler Cap

Provides safety warnings related to fuel and opening the filler cap.

7 Preparing for Use

7.1 Advice on First Use

Provides crucial advice for first-time use, focusing on child readiness and safety.

7.2 Running in the Engine

Details the procedure and guidelines for running in the engine during the initial phase.

8 Riding Instructions

8.1 Checks and Maintenance Measures When Preparing for Use

Lists pre-ride checks and maintenance tasks for safety and operation.

8.2 Starting

Covers starting procedures, including safety warnings and engine conditions.

8.4 Riding

Provides advice on riding, throttle control, and handling unusual noises.

8.5 Braking

Details safe braking techniques, potential issues, and surface considerations.

8.8 Refueling

Provides detailed instructions and safety warnings for refueling the motorcycle.

9 Service Schedule

9.1 Service Schedule

Provides a detailed schedule of maintenance tasks and their frequencies.

10 Tuning the Chassis

10.1 Adjusting the Rebound Damping of the Shock Absorber

Guides on adjusting the shock absorber's rebound damping for optimal performance.

10.5 Adjusting the Spring Preload of the Shock Absorber

Guides on adjusting the spring preload of the shock absorber for ride height.

10.6 Adjusting the Riding Sag

Provides instructions for adjusting the riding sag based on rider weight.

11 Maintenance Work on the Chassis

11.10 Checking Play of Steering Head Bearing

Guides on checking for play in the steering head bearing.

11.11 Adjusting the Play of the Steering Head Bearing

Explains how to adjust the steering head bearing play.

11.33 Checking the Chain Tension

Explains how to check and adjust the chain tension.

11.34 Adjusting Chain Tension

Guides on adjusting the chain tension for proper operation.

11.35 Checking the Chain, Rear Sprocket, Engine Sprocket and Chain Guide

Covers inspection of chain, sprockets, and chain guide for wear.

12 Brake System

12.4 Checking Brake Discs

Guides on checking brake disc thickness and condition for wear.

12.5 Checking Front Brake Fluid Level

Details how to check the front brake fluid level and safety warnings.

12.6 Adding Front Brake Fluid

Guides on adding front brake fluid with safety precautions.

12.7 Checking the Front Brake Linings

Guides on checking the minimum thickness of front brake linings.

12.9 Installing the Front Brake Linings

Guides on installing front brake linings with warnings.

12.10 Changing the Front Brake Linings

Details how to change front brake linings and adjust fluid level.

12.11 Checking the Free Travel of the Foot Brake Lever

Guides on checking the free travel of the foot brake lever.

12.12 Adjusting the Free Travel of the Foot Brake Lever

Explains how to adjust the free travel of the foot brake lever.

12.13 Adjusting the Basic Position of the Foot Brake Lever

Guides on adjusting the basic position of the foot brake lever.

12.14 Checking Rear Brake Fluid Level

Details how to check the rear brake fluid level.

12.15 Adding Rear Brake Fluid

Guides on adding rear brake fluid with safety precautions.

12.16 Checking the Rear Brake Linings

Guides on checking the minimum thickness of rear brake linings.

12.18 Installing the Rear Brake Linings

Guides on installing rear brake linings with warnings.

12.19 Changing the Rear Brake Linings

Details how to change rear brake linings and adjust fluid level.

13 Wheels, Tires

13.5 Checking the Tire Condition

Explains how to check tire condition, tread depth, and age.

13.6 Checking Tire Air Pressure

Guides on checking and correcting tire air pressure for optimal performance.

14 Cooling System

14.2 Checking the Antifreeze and Coolant Level

Guides on checking antifreeze and coolant levels with safety warnings.

14.3 Checking the Coolant Level

Details how to check the coolant level in the radiator.

14.5 Refilling Coolant

Explains how to refill the coolant, including air bleeding.

15 Tuning the Engine

15.4 Carburetor - Idle (50 SX)

Explains carburetor idle settings and adjustment screws for the 50 SX.

15.5 Carburetor - Idle (50 SX Mini)

Explains carburetor idle settings for the 50 SX Mini.

15.6 Carburetor - Adjusting Idle Speed (50 SX)

Guides on adjusting the idle speed for the 50 SX carburetor.

15.7 Carburetor - Adjusting Idle Speed (50 SX Mini)

Guides on adjusting the idle speed for the 50 SX Mini carburetor.

15.9 Checking the Clutch Setting

Guides on checking the clutch setting using a tachometer.

15.11 Adjusting the Clutch

Guides on adjusting the clutch for optimal slip speed.

16 Service Work on the Engine

16.3 Checking the Gear Oil Level

Guides on checking the gear oil level.

16.4 Changing the Gear Oil

Details how to drain and refill gear oil.

16.5 Draining the Gear Oil

Guides on draining the gear oil with safety warnings.

17 Cleaning, Care

17.1 Cleaning Motorcycle

19 Troubleshooting

Engine Does Not Start

Common issues and solutions when the engine fails to start.

Engine Has No Idle

Engine Does Not Speed Up

Engine Has Too Little Power

Troubleshooting steps for a lack of engine power.

Engine Stalls or Pops into Carburetor

Engine Overheats

Troubleshooting causes and solutions for engine overheating.

20 Technical Data

20.1 Engine

Provides specifications for the engine, including displacement, bore, and lubrication.

20.2 Engine Tightening Torques

Lists crucial torque specifications for engine components.

20.3 Carburetor with Carburetor Tuning

Details carburetor types and tuning parameters for different models.

20.4 Capacities

20.5 Chassis

20.7 Fork

20.7.1 50 SX Mini

20.7.2 50 SX

20.8 Shock Absorber

20.8.1 50 SX

20.8.2 50 SX Mini

20.9 Chassis Tightening Torques

Lists crucial torque specifications for chassis components.

21 Substances

2-Stroke Engine Oil

Brake Fluid DOT 4 / DOT 5.1

Coolant

Shock Absorber Oil (SAE 2.5) (50180342S1)

Super Unleaded (ROZ 95/RON 95/PON 91)

Super Unleaded Gasoline, Mixed with 2-Stroke Engine Oil (1:60)

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Table of Contents