How to Change the Coolant in a 2020 Yamaha YZ250X
Shop parts for a 2020 Yamaha YZ250X Dirt Bike.
Keeping your Yamaha YZ250X running cool and reliable is crucial for both performance and longevity, especially when pushing hard on trails or the track. Coolant maintenance is a straightforward yet vital task. Here is your MotoSport-exclusive, step-by-step guide to changing the coolant in your 2020 YZ250X, plus some must-know tips specific to this potent, competition-based two-stroke.
What You Will Need
- Fresh coolant compatible with aluminum engines (preferably OEM-spec)
- Socket set or wrench (to remove drain bolt and radiator cap)
- Catching pan for old coolant
- Rags or paper towels for cleanup
- Protective gloves (recommended)
1. Preparation
- Ensure your YZ250X is on a level surface – ideally with the frame secured on a stand.
- Allow the engine to fully cool to avoid burns when opening the cooling system.
- Remove the shrouds or access panels if they block the radiator cap or drain bolt area.
2. Draining the Old Coolant
- Locate the coolant drain bolt on the water pump cover (right side of the engine).
- Position your catch pan underneath the drain bolt.
- Slowly remove the radiator cap to release any system pressure, then fully remove the drain bolt to let coolant flow out.
- Inspect the coolant for contamination (oil sheen or debris can indicate engine issues).
- With the bike upright, gently lean it from side to side to help fully evacuate old coolant from the system, including the radiators and cylinder head passages.
3. Flushing the System (Optional but Recommended)
- For thorough servicing, pour clean distilled water into the radiators, replace the cap, cycle the water pump briefly by kicking over the engine with the kill switch engaged, then drain again to remove any residual old coolant.
4. Refilling with New Coolant
- Reinstall the drain bolt and ensure it is snug – do not overtighten to avoid damaging the threads.
- Slowly fill the radiator with new coolant – pour until you see coolant reaching the base of the radiator neck.
- Tip: Tilt the bike side-to-side gently or gently squeeze the lower radiator hose to help purge air pockets.
- Continue filling as necessary until the level remains steady.
5. Bleeding Air from the System
- Start the engine and let it idle with the radiator cap off for a minute. Watch for air bubbles escaping – this is normal as remaining air is purged.
- Shut off the engine, top off coolant if needed, and refit the radiator cap securely.
6. Inspect and Reassemble
- Check for leaks at the drain bolt and cap area.
- Reinstall any removed shrouds or guards.
- Check the coolant level again after your first ride, topping off if needed.
YZ250X-Specific Tips & Model Notes
- The 2020 YZ250X is based on Yamaha's legendary YZ250 two-stroke, but it features an enduro-focused engine tune and suspension. This means harder, sustained use in woods or off-road conditions, so coolant condition is especially critical for preventing overheating during technical riding or long races.
- Yamaha recommends checking coolant levels and system condition regularly, even between coolant changes. Replace coolant at least every 2 years, or more frequently with heavy off-road use.
- Always ensure your radiator fins are clean and straight for maximum cooling efficiency. Damaged shrouds, mud, or debris will drastically reduce cooling performance.
- Use a high-quality coolant compatible with aluminum & magnesium alloy components found in Yamaha engines. Avoid plain tap water, which can cause corrosion.
When to Change Your Coolant
- According to Yamaha, replace the coolant at the specified intervals in your owner's manual, or whenever the coolant appears dirty or rusty, after engine overheating, or when servicing the top end.
Final Checks
- Always dispose of old coolant responsibly – it is toxic to people and pets.
- Document maintenance in your logbook for future reference and resale value.
Related Shopping Categories
Shop Radiators for a 2020 Yamaha YZ250X Dirt Bike.
Shop Coolant for a 2020 Yamaha YZ250X Dirt Bike.
Shop Temperature Sensors for a 2020 Yamaha YZ250X Dirt Bike.
Shop Tools for a 2020 Yamaha YZ250X Dirt Bike.
Shop Radiator Hoses for a 2020 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.