How to Change the Coolant in a 2017 Yamaha YZ450F: MotoSport Proprietary Guide

Shop parts for a 2017 Yamaha YZ450F Dirt Bike.

Keeping your 2017 Yamaha YZ450F's cooling system in top condition is essential for durability and performance, especially if you're racing or riding in demanding conditions. Changing the coolant regularlytypically every 12.5 to 20 hours of use, or sooner after heavy racesprevents overheating and corrosion.

What You Need

  • Fresh coolant suitable for aluminum radiator systems
  • Drain pan
  • Socket wrench (10 mm for drain bolt)
  • Phillips screwdriver (for radiator shroud bolts, if needed)
  • Funnel
  • Clean cloths
  • Distilled water (if flushing)
  • Torque wrench

Step-by-Step Coolant Change

  1. Prep the bike:
    Ensure the engine is cool to avoid burns. Set your YZ450F on a stable stand.
  2. Remove the radiator cap:
    Open the radiator cap slowly to release pressure. Remove the front number plate and shrouds if easier access is needed.
  3. Locate the drain bolt:
    The coolant drain bolt is at the side of the water pump (right side of the engine, near the crankcase). Place the drain pan underneath.
  4. Drain the coolant:
    Using your socket wrench, loosen and remove the drain bolt. Allow all coolant to fully drain out. Squeeze the lower radiator hose gently to help evacuate trapped coolant.
  5. Flush if necessary:
    If the coolant is dirty or there's debris, reinstall the bolt, fill the radiator with distilled water, run the engine briefly, then let cool and drain again.
  6. Inspect components:
    Check the copper washer on the drain bolt and the radiator cap seal for wear or damage. Replace if necessary to prevent leaks – leaks are one of the most common issues after a coolant change.
  7. Reinstall and torque the drain bolt:
    Tighten the drain bolt to 10 Nm (7.2 ft–lb) using a torque wrench to avoid overtightening, which can crack the case – an issue occasionally reported with improper procedures.
  8. Add new coolant:
    Use a funnel to pour new coolant into the radiator until full. Gently rock the bike side to side to burp air from the system. The system capacity is approximately 1.1 quarts (1.0 liters).
  9. Bleed air from the system:
    With the radiator cap off, start the engine and let it idle for a minute, topping off the coolant as air escapes. Stop the engine, top up as needed, and reinstall the cap firmly.
  10. Check for leaks & level:
    After a brief ride, let the bike cool, and recheck the coolant level. Inspect all hose connections for any leaks.

Special Notes for 2017 YZ450F Owners

  • Yamaha recommends checking the radiator cap's pressure valve and rubber seal regularly, as these components are vital for maintaining correct coolant pressure and preventing overheating.
  • Avoid using tap water mixed with coolant; always use distilled water when mixing or flushing, as minerals in tap water can corrode aluminum radiators.
  • The YZ450F's compact radiator makes airflow crucial. Ensure radiator fins are clean and straight for best cooling efficiency.
  • Use a quality premixed or mix-to-spec motorcycle coolant rated for aluminum components to maximize lifespan and heat dissipation.

When to Change Coolant

  • Factory interval is about every 12.5 to 20 hours of riding, or every third to fifth maintenance session, depending on conditions and intensity.
  • If the bike has been running hotter than normal, or if coolant appears brown or cloudy, change it immediately to avoid internal corrosion or overheating.

Final Tips

  • Store unused coolant away from children and animals—it is highly toxic.
  • Dispose of the used coolant responsibly at a recycling center or appropriate facility.
  • Never run the bike without coolant—severe engine damage can occur in seconds.

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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.