How to Change the Coolant in a 2013 KTM 350EXCF: MotoSport Guide
Shop parts for a 2013 KTM 350EXCF Dirt Bike.
Keeping your 2013 KTM 350EXCF running at peak performance means routine maintenance, and changing your coolant is a critical part of this process. The following step-by-step guide, exclusive to MotoSport.com, will help you change your coolant easily and safely, with special notes specific to your model.
What You Will Need
- Fresh, compatible coolant (pre-mixed or mix as manufacturer recommends)
- Distilled water (for flushing)
- Socket wrench set (8mm and/or 10mm recommended for drain bolt)
- Funnel
- Catcher pan for old coolant
- Safety gloves and eyewear
- Shop towels
Preparation
- Make sure your KTM 350EXCF is cool to the touch—never attempt this maintenance while the engine is hot.
- Secure the bike upright on a horizontal surface, using a stand if possible.
Step-by-Step Instructions
- Remove the Radiator Cap: With the bike upright, remove the left radiator shroud if easier access is needed. Carefully remove the radiator cap to release any residual pressure.
- Drain Old Coolant: Place a pan beneath the water pump cover (right side of engine). Locate and remove the coolant drain bolt (typically 8mm or 10mm, M6) from the bottom of the water pump cover. Allow all coolant to drain from the system.
- Flush the System (Recommended): Reinstall the drain bolt loosely and fill the system with distilled water. Start the engine and let it idle for a few minutes with the radiator cap off, then shut off and allow cooling. Drain the distilled water via the same procedure. Repeat if the system was especially contaminated.
- Reinstall Drain Bolt: Inspect the crush washer or O-ring on the drain bolt; replace if worn. Tighten the drain bolt to 10 Nm (7.4 lbf ft) for M6 bolts.
- Add New Coolant: Using a funnel, slowly pour new coolant into the radiator until the fluid level reaches the top. Squeeze the radiator hoses by hand to help release trapped air bubbles.
- Bleed the Cooling System: On KTM models including the 350EXCF, trapped air is common. Raise the front wheel (ideally about 19 inches, such as on a motorcycle stand), slowly fill and top off the radiator as any air escapes. If your model is equipped with cylinder head bleed screws, loosen gently to allow air to vent as coolant fills, then re-tighten.
- Reinstall Radiator Cap & Inspect: Once the system is completely full and free of bubbles, reinstall the radiator cap securely.
- Run the Engine & Re-check: Let the bike idle until it reaches operating temperature. Shut it down and let it cool; re-check the coolant level and top off if necessary.
Things Specific to the 2013 KTM 350EXCF
- The 350EXCF uses a relatively small coolant capacity. Do not overfill, and always check levels after bleeding.
- Factory KTM guidance recommends using specific ready-to-use coolant that is compatible with aluminum parts–avoid automotive coolants containing silicates or phosphates.
- Air locks are a common problem; raising the front and squeezing hoses during filling helps, as does opening head bleed screws if your bike's configuration has them.
- Check for any coolant leaks around the water pump seal and radiator hoses after your first ride post-service.
Coolant Change Intervals & Tips
- Check coolant level frequently, especially after first change and after hard rides.
- Replace coolant at least every two years, or sooner if you ride in extreme conditions.
- Sport-legal and offroad events may require specific types of coolant—always check event rules before heading out.
Performing your own coolant change keeps maintenance costs low and your 2013 KTM 350EXCF in top riding shape. For the genuine OEM replacement parts, high-performance coolants, and the tools you need, MotoSport.com is your partner for all maintenance essentials.
Related Shopping Categories
Shop Radiators for a 2013 KTM 350EXCF Dirt Bike.
Shop Coolant for a 2013 KTM 350EXCF Dirt Bike.
Shop Temperature Sensors for a 2013 KTM 350EXCF Dirt Bike.
Shop Tools for a 2013 KTM 350EXCF Dirt Bike.
Shop Radiator Hoses for a 2013 KTM 350EXCF Dirt Bike.
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.