How to Change the Coolant in a 2020 KTM 350XCFW: Step-by-Step Guide
Shop parts for a 2020 KTM 350XCFW Dirt Bike.
Changing the coolant in your 2020 KTM 350XCFW is a crucial maintenance task to ensure optimal cooling performance, reliability, and engine longevity. The design of KTM's 350XCFW makes coolant changes straightforward, but following the right procedure ensures the job is done right – and your bike gets the most protection. Below is a unique MotoSport.com-exclusive guide for owners of this model year KTM dirt bike.
What Makes the 2020 KTM 350XCFW Coolant Change Unique?
- Engine architecture: The off-road tuned 350XCFW shares much of its cooling system design with KTM's race models, but uses specific radiator cap pressures and cooling passages tuned for trail and endurance riding.
- Bleed procedure: Full removal of trapped air is critical on this chassis, especially after a flush or refill, to avoid hot spots and overheating.
- Coolant choice: KTM specifies silicate-free, high-performance coolants for long-life and to avoid water pump seal and bearing wear.
Tools & Supplies Needed
- New coolant (KTM recommends a high-quality, silicate-free formulation rated for aluminum engines)
- 8mm socket or wrench
- Catcher pan or container for used coolant
- Funnel
- Clean rags
- Torque wrench (recommended)
- Distilled water (for flushing, if desired)
Step-by-Step Coolant Replacement Process
- Let the engine cool fully. Never attempt to open a hot radiator cap, as the system will be under pressure and can cause serious burns.
- Remove the radiator cap. Twist counterclockwise and lift the cap off the right radiator. This releases any residual pressure and allows air into the system for complete draining.
- Locate and remove the coolant drain bolt. On the 2020 KTM 350XCFW, the drain bolt is typically on the lower water pump cover and requires an 8mm socket or wrench. Place the drain pan underneath before loosening the bolt. Allow coolant to flow out fully.
- Inspect drained coolant. Old coolant should be clear and bright. Any murkiness, debris, or oil may indicate engine wear and should be investigated.
- Optional: Flush the cooling system. For a complete coolant exchange, fill the system with distilled water, reinstall the radiator cap, run the engine briefly (without allowing it to overheat), then drain again. Repeat until the water runs clear.
- Reinstall the drain bolt. Tighten the bolt to manufacturer torque spec (consult your KTM manual, but typically around 6 Nm for the water pump cover bolt). Do not overtighten.
- Fill with new coolant. Using a funnel, slowly pour the coolant into the radiator until full. You may need to gently "burp" the system–tilting the bike side to side–to release trapped air.
- Check coolant level and bleed air. For the 350XCFW, it's especially important to work out air bubbles that may get trapped. Squeeze both radiator hoses gently with your hand while the cap is off, and top up as the coolant level drops.
- Reinstall the radiator cap. Ensure it's seated and tightened securely.
- Start the engine and warm up. Allow the bike to idle for several minutes, watching for leaks and ensuring the cooling fan cycles on (if equipped). Shut down, let it cool, and recheck the level. Top off as needed.
Pro Tips for Your KTM 350XCFW
- If your bike is fitted with a cooling fan, verify fan operation after the coolant change to ensure the electrical system is functioning as intended.
- Never mix coolant types. Stick with the recommended formula to prevent chemical contamination that can harm water pump seals and radiators.
- Regularly inspect the radiator cap seal. The KTM 350XCFW relies on pressure control for proper cooling – a damaged cap can lead to overheating.
- Schedule a coolant change at least once per year or after severe use/races for maximum reliability.
Keeping the cooling system in top condition will help your 2020 KTM 350XCFW run cooler and last longer under the harshest riding conditions. For parts and high-quality coolant specifically for your bike, remember: Shop parts for a 2020 KTM 350XCFW Dirt Bike.
Related Shopping Categories
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Shop Radiator Hoses for a 2020 KTM 350XCFW 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.