How to Change the Coolant in a 2012 KTM 350EXCF

Shop parts for a 2012 KTM 350EXCF Dirt Bike.

Routine coolant changes are key to the performance & longevity of your 2012 KTM 350EXCF. Swapping out the old coolant ensures your engine stays protected from corrosion, overheating, and maximizes efficiency in the most demanding riding conditions. Below, you will find MotoSport's proprietary step-by-step guide for this important maintenance task, along with model-specific notes for your KTM.

What You Will Need

  • Fresh coolant (compatible with KTM aluminum engine components)
  • Distilled water (for flush, if desired)
  • Drain pan
  • 8mm socket or wrench
  • Funnel
  • Gloves & eye protection
  • Shop towels or rags

Preparation

  • Ensure the bike is completely cool. The cooling system on KTM models operates at high pressure – removing the cap from a hot system risks serious scalding. Always allow the engine to cool completely before beginning service.
  • Stabilize the bike on a stand in a well-ventilated area.

Drain the Old Coolant

  • Remove the seat and the radiator shrouds to access the radiators, if needed.
  • Remove the radiator cap to relieve pressure in the system.
  • Locate the coolant drain bolt on the water pump (lower right engine cover). Use the 8mm socket to remove this bolt and allow the coolant to drain into your pan.
  • Inspect the old coolant for signs of debris, oil, or excessive discoloration, which could indicate internal issues.
  • Once drained, reinstall and torque the drain bolt securely.

Flushing (Recommended)

  • For optimal protection, flush the system with fresh distilled water: fill the radiator with distilled water, run the engine for a few minutes, let it cool, and repeat the drain procedure. This step helps remove old coolant and contaminants.
  • For severe contamination, repeat the flush until the water drains clean.

Refilling With New Coolant

  • Using a funnel, slowly fill the radiator with the new premixed coolant, topping off until fluid is visible just below the base of the radiator neck.
  • Allow the bike to settle. Gently squeeze the radiator hoses to release air pockets (bubbles).
  • Top off the coolant as needed. Reinstall the radiator cap securely – ensure it is seated and tightened to specification (the 2012 KTM 350EXCF uses a 1.8 bar cap).

Final Steps

  • Reinstall any removed plastics and the seat.
  • Start the engine and let idle with the radiator cap on for several minutes, monitoring the coolant's level and checking for leaks.
  • Shut off the engine, allow to cool, and recheck the coolant level. Add more if needed.

KTM 350EXCF Model-Specific Notes

  • Overheating Risk: The 350EXCF's high-revving engine and compact radiators make coolant quality and level even more critical. Always inspect the radiator fins for obstructions, mud, or bends, as airflow is essential.
  • Cap Pressure: KTM specifies a radiator cap rated to 1.8 bar (26 psi). Using the correct cap maintains proper boiling point and pressure integrity in the closed system.
  • Air Filter Waterproofing: If performing frequent water crossings or riding in wet conditions, consider waterproofing the air filter, as recommended in the owner's manual.

Disposal Reminder

  • Dispose of used coolant safely – it is highly toxic. Many local auto parts stores accept used coolant for safe recycling. Avoid spills and keep coolant away from children and animals.

Regular cooling system maintenance is vital for keeping your 2012 KTM 350EXCF running strong, even in extreme off-road conditions. Don't overlook this straightforward but crucial task for long engine life and reliable performance.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.