How to Change the Coolant in a 1997 Honda CR500

Shop parts for a 1997 Honda CR500 Dirt Bike.

Maintaining the cooling system on your 1997 Honda CR500 is essential for keeping this legendary dirt bike running strong. A regular coolant change is key–especially given the power and renowned air-and-liquid-cooled setup of the CR500. Below you'll find a proprietary MotoSport step-by-step guide to changing the coolant on your CR500, plus tips unique to this powerhouse machine.

Why Change the Coolant?

The CR500's high-performance two-stroke engine generates considerable heat, and its aluminum radiators require a specific ethylene glycol-based coolant for optimal protection. Old coolant loses its effectiveness over time, risking overheating, corrosion, and costly engine damage.

Items You'll Need

  • Ethylene glycol-based coolant (never use plain water or automotive coolant with silicates)
  • New water pump crush washer
  • Drain pan
  • 8mm and 10mm sockets
  • Flathead screwdriver
  • Funnel
  • Shop towels
  • Safety gloves & goggles

Step-by-Step Coolant Change for the 1997 Honda CR500

  1. Let the engine cool completely.
    If the bike was recently running, allow it to cool for at least an hour.
  2. Remove the radiator cap.
    Place a rag around the cap before loosening for safety, as residual pressure can force coolant out. Twist the cap off slowly.
  3. Remove the coolant drain bolt.
    Locate the coolant drain bolt–typically on the water pump cover (right side of engine, low and forward). Place the drain pan underneath.
    Remove the bolt with an 8mm or 10mm socket and allow the old coolant to fully drain.
  4. Inspect & replace the crush washer.
    The CR500 uses a small sealing washer to prevent leaks. Always install a new washer with the drain bolt for best results.
  5. Reinstall the drain bolt.
    Hand-tighten first, then torque snugly but do not over-tighten – the cases are aluminum and vulnerable to stripping.
  6. Flush if needed.
    If the drained fluid was dirty or rusty, flush the system by pouring a small amount of distilled water into the radiator, reinstalling the cap, running the engine very briefly, then draining again. Repeat until the fluid runs clear.
  7. Add new coolant.
    With the drain bolt installed, use a funnel to add ethylene glycol-based coolant (Honda HP or equivalent) to the radiator until it reaches the filler neck.
  8. Bleed the air.
    Leave the cap off and slowly squeeze then release the radiator hoses a few times. This helps release trapped air bubbles. Top off as needed.
  9. Reinstall the radiator cap.
    Ensure it's seated and tightened firmly.
  10. Start the engine & recheck levels.
    Start the CR500 and let it idle for 1–2 minutes. Shut off the engine, allow to cool, then check coolant level again and top off if necessary.

CR500 Owner Notes – Model-Specific Details

  • The CR500's cooling system is designed for serious riding. Make sure you NEVER substitute standard automotive coolant; always use motorcycle-specific coolant compatible with aluminum radiators.
  • While the CR500 is famously rugged, pay close attention to any leaks, especially at hose junctions or the water pump cover. Replace worn hoses or cracked radiator caps promptly.
  • If you do a lot of hard riding, more frequent coolant changes can prevent late-race overheating and prolong the life of your top end.
  • This model uses a gravity-fed system with no expansion tank. Fill slowly and double-check for air pockets to prevent overheating on your next ride. Some bikes may kick out small amounts of fluid after the first ride post-change as the system finds equilibrium; check and refill as needed.
  • Dispose of old coolant responsibly at your local recycling center. Coolant is toxic to people and animals.

Extra Tips for Longevity

  • Check coolant level before every ride, especially if you race or ride in hot climates.
  • If you notice coolant loss after a ride, inspect the radiator and hoses for damage. The CR500's tall radiators are particularly vulnerable to tip-over impacts; MotoSport stocks replacement parts.
  • During reassembly, make sure all shrouds and radiator louvers are securely attached for maximum airflow and cooling efficiency.

With regular coolant care and the right products, your 1997 Honda CR500 will keep its edge on trails and tracks for years to come.

Related Shopping Categories

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Shop Temperature Sensors for a 1997 Honda CR500 Dirt Bike.

Shop Tools for a 1997 Honda CR500 Dirt Bike.

Shop Radiator Hoses for a 1997 Honda CR500 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.