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KTM 250 SX 2010 - User Manual

KTM 250 SX 2010
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OWNER'S MANUAL 2010
125 SX
150 SX
250 SX
Art. no. 3211480en

Table of Contents

Questions and Answers

  • J
    johnfosterAug 17, 2025
    What to do if KTM 250 SX 2010 Motorcycle engine does not speed up?
    • P
      pingramAug 18, 2025
      If your KTM Motorcycle engine does not speed up, it could be due to a few reasons. One possibility is that the carburetor is running over because the float needle is dirty or worn, in which case you should check/set the carburetor components. Another reason might be loose carburetor jets, so check/set the carburetor components. Finally, a fault in the ignition system could also be the cause, requiring you to check the ignition system.
  • S
    Steven WhiteheadAug 21, 2025
    Why does my KTM 250 SX 2010 Motorcycle engine have so little power?
    • J
      Janet GarciaAug 21, 2025
      If your KTM Motorcycle engine has too little power, the issue could stem from several causes. A potential reason is an interrupted fuel feed, so check the fuel tank breather, clean the fuel tap, and inspect/set the carburetor components. A very dirty air filter can also restrict power, so clean the air filter. Inspect the exhaust system for leaks or deformation and replace the glass fiber yarn filling in the main silencer if it's insufficient. A fault in the ignition system could also be the culprit, requiring a check of the ignition system. Finally, inspect the diaphragm and reed valve housing for any damage.
  • K
    Kathryn DunnAug 25, 2025
    What to do if KTM Motorcycle engine stalls or pops in carburetor?
    • A
      Audrey GomezAug 25, 2025
      If your KTM Motorcycle engine stalls or pops into the carburetor, it could be due to several reasons. First, ensure the fuel tap is in the ON position and refuel if the tank is low. Also, check the intake flange and carburetor for tightness, as the engine might be taking in bad air. Clean any loose or oxidized socket connectors or the ignition coil, and treat them with contact spray. Finally, check the cooling system for leakage and ensure the coolant level is adequate.
  • A
    Amy Rice DDSAug 28, 2025
    How to fix KTM Motorcycle engine overheating?
    • J
      Joseph GonzalesAug 28, 2025
      If your KTM Motorcycle engine is overheating, start by cleaning the radiator fins, as they might be very dirty. If there's foam formation in the cooling system, drain the coolant and refill it. Inspect the cylinder head and cylinder head gasket for damage. Check for any bent radiator hoses and replace them if necessary. Lastly, adjust the ignition if the incorrect ignition point is due to a loose stator.
  • M
    Melinda LewisAug 31, 2025
    Why KTM Motorcycle engine has no idle?
    • J
      Jacqueline AndrewsAug 31, 2025
      If your KTM Motorcycle engine has no idle, the possible reasons are the following: * Idling jet blocked, so you should check/set the carburetor components. * Adjusting screws on carburetor distorted, so you should adjust the idle speed. * Spark plug defective, so you should change the spark plug. * Ignition system defective, so you should check the ignition coil and the spark plug connector.
  • D
    dhessSep 3, 2025
    Why is my KTM 250 SX 2010 Motorcycle emitting white smoke?
    • J
      jamiechanSep 3, 2025
      If your KTM Motorcycle is emitting white smoke (steam) in the exhaust gas, it could be due to a damaged cylinder head or cylinder head gasket. Inspect the cylinder head and cylinder head gasket for damage.
  • E
    eileenmccartySep 7, 2025
    Why is gear oil coming out of the vent hose on my KTM 250 SX 2010 Motorcycle?
    • M
      Michael DawsonSep 7, 2025
      If gear oil is exiting at the vent hose of your KTM Motorcycle, it is likely because too much gear oil was added. Check the gear oil level.
  • R
    Renee MckaySep 10, 2025
    How to fix water in the gear oil of my KTM 250 SX 2010?
    • T
      Tamara RangelSep 10, 2025
      If there's water in the gear oil of your KTM Motorcycle, it could be due to a damaged shaft seal ring or water pump. Check the shaft seal ring and water pump.
  • A
    Anna WilliamsNov 13, 2025
    What to do if my KTM 250 SX 2010 Motorcycle engine turns but doesn't start?
    • K
      kathleenandersonNov 13, 2025
      If your KTM Motorcycle engine turns over but doesn't start, several factors could be at play. First, review the engine starting procedure. If the motorcycle has been sitting unused for an extended period, the carburetor float chamber may contain old fuel, in which case you should empty it. Check for any interruptions in the fuel feed by inspecting the fuel tank breather and cleaning the fuel tap. Additionally, inspect and adjust the carburetor components. If the engine is flooded or the spark plug is oily or wet, clean and dry the spark plug, replacing it if necessary. Ensure the spark plug electrode gap is correctly adjusted to 0.60 mm (0.0236 in). Also, inspect the ignition system, check the short circuit button, and clean any loose or oxidized socket connectors or the ignition coil, tre...

Summary

IMPORTANT INFORMATION

CONTROLS

Handlebar Controls

Gear Shifting and Braking

GENERAL TIPS AND HINTS ON PUTTING INTO OPERATION

Advice on First Use

Provides safety advice and pre-ride checks for new users of the motorcycle.

RIDING INSTRUCTIONS

Pre-Ride Checks and Starting

Essential checks before riding and procedures for starting the engine.

Shifting, Riding, and Braking

Explains gear shifting techniques and effective braking strategies.

Stopping, Parking, and Refueling

Procedures for safe stopping, parking, and refueling the motorcycle.

SERVICE SCHEDULE

Workshop and Rider Maintenance Tasks

Lists maintenance tasks for authorized workshops and the rider.

MAINTENANCE WORK ON CHASSIS AND ENGINE

Chassis Setup and Suspension

Adjusting suspension (fork, shock absorber), sag, and basic chassis settings.

Wheel and Brake System Maintenance

Chain and Sprocket Maintenance

Engine Oil and Gearbox Maintenance

Checking, changing, and refilling engine and gearbox oil.

TROUBLESHOOTING

Engine Start and Performance Issues

Diagnosing and resolving engine start, idle, and power problems.

Engine Overheating and Stalling

Troubleshooting causes for engine overheating and stalling.

CLEANING

TECHNICAL DATA - ENGINE

TECHNICAL DATA - ENGINE TIGHTENING TORQUES

TECHNICAL DATA - CARBURETOR

TECHNICAL DATA - FORK

TECHNICAL DATA - SHOCK ABSORBER

TECHNICAL DATA - TIGHTENING TORQUES FOR CHASSIS

WIRING DIAGRAM

Electrical System Schematic

SUBSTANCES

KTM 250 SX 2010 Specifications

General IconGeneral
Displacement249 cc
Bore x Stroke66.4 mm x 72 mm
Cooling SystemLiquid-cooled
Transmission5-speed
Rear SuspensionWP Monoshock
Front BrakeSingle Disc, 260 mm
Rear BrakeSingle Disc, 220 mm
Seat Height992 mm
Ground Clearance385 mm
Fuel SystemCarburetor
IgnitionKokusan
StarterKickstarter
Front Tire80/100-21
Rear Tire110/90-19
Wheelbase1475 mm
Engine TypeSingle Cylinder, 2-Stroke
Front SuspensionWP USD Fork, 48 mm
Fuel Capacity7.5 liters

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