How to Change the Coolant in a 2017 Yamaha YZ250X
Shop parts for a 2017 Yamaha YZ250X Dirt Bike.
Keeping your Yamaha YZ250X performing its best requires routine cooling system service. Fresh coolant helps regulate engine temperature, prevents overheating, and guards your radiator and engine components from internal corrosion. The YZ250X, Yamaha's highly-regarded 2-stroke off-road dirt bike, uses a liquid cooling system with aluminum radiators – making regular coolant changes even more important for longevity and reliability. Below, find step-by-step, MotoSport-exclusive instructions tailored to your 2017 YZ250X.
What You Need
- Quality ethylene glycol-based coolant (with anti-corrosion for aluminum engines)
- Container to catch old coolant
- Socket/ratchet set
- Torque wrench
- Copper washer (may be replaced with new, if worn)
- Clean water for flushing
- Funnel (recommended for cleaner filling)
- Protective gloves and rags
Step-by-Step: YZ250X Coolant Change Procedure
- Cool Down Completely
Ensure the engine is completely cool before starting—never open the radiator cap on a hot engine to avoid burns and coolant loss through pressure release. - Prepare the Area
Place your dirt bike on a stand. Put a suitable container under the engine to catch old coolant. Protect painted surfaces, as spilled coolant can cause damage. Clean spills promptly with water. - Remove the Radiator Cap
This helps the system breathe and drain more completely. - Drain the Coolant
Locate and remove the coolant drain bolt at the bottom of the water pump (right side of the engine). Let all fluid drain into your container. - Flush the System (Recommended)
Reinstall the drain bolt loosely. Fill the radiator with clean tap water, then open the drain again to flush out residues. Repeat until water runs clear, for best cooling performance. - Install Drain Bolt and Washer
Inspect and reinstall the copper washer and drain bolt. Tighten to the factory spec of 10 Nm (7.2 ft-lb). Avoid overtightening to prevent stripping aluminum threads. - Refill with Coolant
Using a funnel, pour fresh coolant (50/50 mix with soft water if using concentrate) into the radiator—capacity is 1.20 liters (1.27 US qt). Fill to the top of the radiator filler neck. - Remove Trapped Air
Gently rock the bike side-to-side. You can start the engine (with the radiator cap still off) and let it idle briefly to help bleed air bubbles. Watch the coolant: as bubbles stop surfacing, top off as needed. - Reinstall Radiator Cap
After confirming the level is correct and air is released, reinstall the cap securely. - Check for Leaks
Inspect hoses, drain bolt, and radiator cap for any signs of leakage. Run the bike and allow to fully warm up, then recheck the coolant level and top off if needed.
YZ250X Owner Notes – 2017 Model Specifics
- The 2017 YZ250X radiator system is designed for aggressive off-road riding; intensive woods riding or high-ambient temperatures demand you check and change coolant more often than casual use.
- Always use coolant specifically formulated for aluminum radiators and engine components to prevent internal corrosion. Never use plain water unsupplemented for long-term operation.
- Check the condition of hoses and the radiator cap's spring at every service. Replace any components that show signs of aging or cracking.
- If you ride in cold climates, use coolant with antifreeze appropriate for your temperatures to avoid freezing and damaging the system.
Final Tip
If you're prepping for a race or enduro, always change coolant pre-season and after any overheating event. That ensures your engine will handle tough conditions when it counts.
Related Shopping Categories
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Shop Radiator Hoses for a 2017 Yamaha YZ250X 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.