KTM 125 EXC EU User Manual (English)

Questions and Answers:

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Sherry WilliamsAug 21, 2025
Why my KTM Motorcycle engine turns over but won't start?
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  Christopher HuntAug 21, 2025
  If your KTM Motorcycle engine turns over but doesn't start, it might be due to a few reasons. Ensure you are following the correct start procedure. If the motorcycle has been out of use for a while, the fuel in the float chamber might be old, consider emptying the carburetor float chamber. Check for any interruptions in the fuel feed by inspecting the fuel tank breather and cleaning the fuel tap. Also, a spark plug that's oily or wet could be the culprit, so clean, dry, or replace it. Adjust the plug gap to 0.60 mm (0.0236 in). Finally, check the connector or ignition coil and clean it with contact spray if it is loose or oxidized.
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vincentyoungAug 22, 2025
How to prevent my KTM 125 EXC EU Motorcycle engine from overheating?
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  Rebecca FarrellAug 23, 2025
  To prevent your KTM Motorcycle engine from overheating, ensure there's enough coolant in the system by checking for leaks and verifying the coolant level. Avoid idling when stationary to maintain airflow. Clean any dirt from the radiator fins. Also, inspect the cylinder head and head gasket for damage.
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Timothy ReedAug 25, 2025
Why does my KTM Motorcycle engine have low power?
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  Tammy MooreAug 25, 2025
  If your KTM Motorcycle engine has too little power, the issue could stem from a few causes. Check for interruptions in the fuel feed by inspecting the fuel tank breather, cleaning the fuel tap, and checking the carburetor components. Inspect the exhaust system for damage and replace the glass fiber yarn filling of the main silencer. Also, check the diaphragm and reed valve housing.
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michael07Aug 27, 2025
What to do if my KTM 125 EXC EU engine stalls?
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  Melissa WalkerAug 27, 2025
  If your KTM Motorcycle engine stalls or pops into the carburetor, it could be due to a lack of fuel. Ensure the fuel tap is in the ON position and refuel if necessary. Also, check the intake flange and carburetor for tightness, as the engine might be taking in bad air. Clean the connector and treat it with contact spray if it is loose or oxidized.
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Paul MaciasAug 28, 2025
How to fix a KTM 125 EXC EU Motorcycle engine with no idle?
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  Mary MartinezAug 28, 2025
  If your KTM Motorcycle engine has no idle, the possible causes are the following: the idling jet is blocked, so check the carburetor components; the spark plug is defective, so change it.
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John VasquezAug 29, 2025
Why KTM Motorcycle engine won't speed up?
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  Ernest TranAug 29, 2025
  If your KTM Motorcycle engine won't speed up, it could be due to the carburetor running over because the float needle is dirty or worn, or the carburetor jets are loose. In both cases you should check the carburetor components.
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Jennifer BonillaAug 31, 2025
Why is my KTM Motorcycle emitting white smoke?
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  Patrick CruzAug 31, 2025
  If your KTM Motorcycle is emitting white smoke, it could be due to a damaged cylinder head or cylinder head gasket. You should check these parts for damage.
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Joyce NortonSep 2, 2025
Why is gear oil coming out of the vent hose on my KTM 125 EXC EU?
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  Michael MunozSep 2, 2025
  If gear oil is exiting at the vent hose of your KTM Motorcycle, it's likely because too much gear oil was added. Check the gear oil level.
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emily53Sep 3, 2025
How to fix water in the gear oil of my KTM 125 EXC EU?
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  reynoldsmichaelSep 3, 2025
  If there's water in the gear oil of your KTM Motorcycle, it suggests a damaged shaft seal ring or water pump. Check these components for damage.
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Mary SotoSep 6, 2025
Why is my KTM Motorcycle engine overheating?
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  austin50Sep 7, 2025
  If your KTM Motorcycle engine is overheating, start by checking the coolant level and inspecting the cooling system for leaks. Ensure the radiator fins are clean to allow for proper cooling. Foam formation in the cooling system can also cause overheating, so the coolant should be drained and refilled. Inspect the cylinder head and cylinder head gasket for any damage. Finally, check for any bent radiator hoses.