How to Change the Coolant in a 2020 Yamaha YZ250FX: Step-by-Step Maintenance for Your Dirt Bike
Shop parts for a 2020 Yamaha YZ250FX Dirt Bike.
Regular coolant changes are crucial to keep your 2020 Yamaha YZ250FX running efficiently and to prevent engine overheating. Unlike older bikes, the YZ250FX uses a modern, closed-loop liquid cooling system designed for aggressive off-road use. Follow this MotoSport-exclusive guide to safely and thoroughly change the coolant:
What You Need
- Bike stand
- Coolant compatible with aluminum engines (avoid automotive coolant)
- Drain pan
- Rags and gloves
- Socket wrench set
- Distilled water (for optional flushing)
Step-by-Step Coolant Change Process
- Let the engine cool: Always begin with a cold engine to avoid burns. Place your bike on a stable stand.
- Remove necessary panels: Take off shrouds or number plates as needed for direct access to the radiator cap and coolant drain bolt.
- Position the drain pan: Set it under the water pump area of the engine to catch old coolant.
- Remove radiator cap: Slowly loosen the cap to prevent sudden release of pressure. Do not remove it completely until the hissing stops.
- Drain the system: Locate and remove the coolant drain bolt (usually on the water pump cover) with a socket wrench. Allow coolant to drain fully.
– Inspect the drain bolt washer. Replace if damaged to avoid leaks. - (Optional) Flush the system: Reinstall the drain bolt and fill the radiator with distilled water. Run the engine briefly, let it cool, then drain again for a thorough flush.
- Reinstall drain bolt: Torque it to factory specs to avoid overtightening the threads.
- Add new coolant: Slowly pour in the recommended coolant until the radiator is full. For the YZ250FX, use a quality motorcycle coolant suitable for aluminum radiators.
– Never mix different coolant types. - Bleed air: Tip the bike side-to-side and gently squeeze the radiator hoses to remove trapped air. Top off the coolant if necessary.
- Reassemble: Tighten the radiator cap and reinstall any panels removed.
- Check coolant level: Start the engine and let it idle until warm. Shut off and recheck coolant level, topping off as needed.
- Dispose of old coolant responsibly: Do not pour it down drains or on the ground; most auto parts stores accept used coolant.
Notes for YZ250FX Owners
- This model's high-performance liquid-cooled engine is sensitive to coolant quality–always use a product approved for motorcycles with aluminum engines to prevent corrosion and overheating.
- Check the entire cooling system for leaks, worn hoses, and damaged radiator fins during every coolant service.
- Service intervals can vary if you ride in muddy or extreme conditions—inspect the coolant more frequently in harsh environments.
- Never use coolant with silicate or phosphate additives not suitable for modern motocross bikes.
Maintaining fresh coolant is essential for extending the life of your Yamaha YZ250FX and ensuring peak performance every ride. For all your maintenance needs and replacement parts, MotoSport has you covered.
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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.