How to Change the Coolant in a 2025 KTM 350EXCF: Step-by-Step Guide
Shop parts for a 2025 KTM 350EXCF Dirt Bike.
Changing the coolant on your 2025 KTM 350EXCF is essential maintenance to keep your bike running cool and performing at its best–especially under demanding conditions. Below, MotoSport breaks down the proprietary process and highlights model-specific insights to ensure a smooth, hassle-free coolant change for your exact MMY dirt bike.
What Makes the 2025 KTM 350EXCF Unique?
The 2025 350EXCF pairs race-winning engine performance with precision electronics, and its cooling system is engineered for efficient temperature management. This model uses parallel radiators–meaning both left and right radiator sections are connected, so draining affects the entire system. Always use coolants specified for KTM aluminum components and avoid overfilling, as expansion can force excess through the overflow when hot.
Required Supplies
- Correct type of coolant (KTM approved, aluminum safe)
- Distilled water (for optional flush)
- Socket set or appropriate wrench
- Drain pan
- Funnel
- Protective gloves
- Clean shop towels
Step-by-Step Coolant Change for KTM 350EXCF
- Allow the engine to cool completely. Never remove the radiator cap while hot–steam and pressurized coolant can cause severe burns.
- Remove the radiators' access panels or shrouds as needed to expose the radiator cap and drain bolt, ensuring stable access.
- Place your drain pan under the water pump area.
Locate the coolant drain bolt–typically found on the lower side of the water pump cover. - Remove the drain bolt and the radiator cap. Loosen the radiator cap first to relieve negative pressure, then fully remove it. Allow all coolant to fully drain from both radiators. The connected design means fluid should exit steadily from both sides.
- If performing a flush, refit the drain bolt and fill the radiators with distilled water, then drain again. Repeat this rinse cycle until the draining water runs clear.
- Reinstall the drain bolt securely. Replace any sealing washer or O-ring if damaged to avoid leaks.
- Fill the radiator system with fresh coolant.
- Pour slowly using a funnel at the radiator fill neck.
- For the KTM 350EXCF, fill until the coolant just covers the internal fins, but do not overfill; leave space for expansion.
- With the front wheel on the ground, tilt the bike gently side to side to help air bubbles escape. - Check for bleeder screws on the cylinder head or radiator, if equipped. Some KTM models allow you to loosen these briefly to purge trapped air; retighten as soon as coolant seeps out.
- Replace the radiator cap and reinstall any panels or shrouds.
- Start the bike and let it idle until it warms up.
- Watch the coolant level and top off as needed.
- Check for leaks at the drain bolt and around the radiators.
Pro Tips for 2025 KTM 350EXCF Owners
- Always use a coolant formulated for KTM motorcycles–mixing coolants can cause chemical reactions and radiator damage.
- Inspect hoses for swelling or wear during every coolant change.
- Do not fill coolant all the way to the cap–leave head space for thermal expansion to prevent overflow through the cap vent.
- Check coolant level before each ride; a steady drop often indicates a leak or head gasket issue.
- If the bike has run hot or overheated, perform a coolant change sooner to protect critical engine parts.
Maintenance Reminder
KTM recommends checking and topping off coolant levels regularly and performing a full change per your owner"s manual interval or after any overheating event. Routine inspection keeps your 350EXCF running reliably on the trail or track.
Related Shopping Categories
Shop Radiators for a 2025 KTM 350EXCF Dirt Bike.
Shop Coolant for a 2025 KTM 350EXCF Dirt Bike.
Shop Temperature Sensors for a 2025 KTM 350EXCF Dirt Bike.
Shop Tools for a 2025 KTM 350EXCF Dirt Bike.
Shop Radiator Hoses for a 2025 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.