How to Change the Coolant in a 2017 Yamaha YZ250
Shop parts for a 2017 Yamaha YZ250 Dirt Bike.
Maintaining your 2017 Yamaha YZ250 includes routine coolant changes to keep the engine running at ideal temperature and safeguard critical components. Here is a step-by-step MotoSport guide uniquely tailored for your YZ250, with model-specific advice to ensure a smooth and effective coolant swap.
Essential Notes for YZ250 Owners
- Caution: Never remove the radiator cap when the engine is hot—wait until everything cools to prevent injury from pressure or hot coolant spray.
- Take care not to spill coolant on painted surfaces. If it happens, rinse immediately with water to prevent damage.
- This model recommends only high-quality ethylene glycol antifreeze with anti-corrosion properties suitable for aluminum engines. Mix coolant and soft water at a 50%/50% ratio for optimal performance.
- The total coolant system capacity is 1.20 liters (1.27 US quarts). Overfilling or underfilling may affect cooling efficiency.
Tools & Supplies Needed
- 8mm or 10mm wrench (check your coolant drain bolt size)
- Drain pan or suitable container
- New coolant (see recommendations above)
- Funnel
- Distilled or soft water
- Clean rags
- Torque wrench (recommended for reassembly)
Step-By-Step Coolant Change Instructions
- Ensure the bike is completely cool. Place your YZ250 on a stable stand to keep it upright.
- Remove the radiator cap on the left side. Loosen it, but do not take it off until pressure is fully relieved.
- Locate the coolant drain bolt at the side of the engine's water pump cover (typically the lowest bolt).
- Place the drain pan directly below the drain bolt. Remove the bolt and allow all old coolant to drain completely. Open both radiators' top bleed screws if equipped for better flow.
- Flush the system. To ensure a clean system, pour soft tap water or distilled water through the radiator. Let it drain out fully, then repeat as necessary until the water runs clear.
- Reinstall the drain bolt with its copper washer. Tighten to 10 Nm (7.2 ft–lb) torque to avoid leaks.
- Slowly fill the radiator with premixed coolant up to the base of the cap. For best results, lightly tap the hoses to remove trapped air bubbles. Add in small increments, let it settle, and top up as needed.
- Replace the radiator cap securely.
- Start the motorcycle and let it idle for 3-5 minutes. This helps purge air from the cooling system. Turn off the bike, let it cool, then check and top up the coolant level if needed.
- Inspect for leaks around the drain bolt and hose connections after the engine heats and cools once more.
Model-Specific Advice
- The YZ250's lightweight aluminum frame and engine components make it essential to use the right coolant blend to avoid corrosion.
- Routine coolant replacement is especially important for motocross bikes like the YZ250 that experience high RPMs and sustained thermal load.
- Inspect radiator hoses and clamps during each coolant change—replace any that show cracking or bulging, as older hoses on a 2017 may degrade after repeated heat cycles.
Following these steps ensures your Yamaha YZ250's cooling system remains reliable, whether you are trail riding or hitting the motocross track hard. Regular maintenance prevents overheating and maximizes engine life—ride confidently and keep your 2-stroke running strong.
Related Shopping Categories
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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.