How to Change the Coolant in a 1992 Honda CR500

Shop parts for a 1992 Honda CR500 Dirt Bike.

The 1992 Honda CR500 is famous for its incredible power, air-cooled simplicity, and robust performance in any riding environment. To keep its legendary two-stroke engine performing at its best, regular coolant changes are essential. Follow this MotoSport.com guide for a fast and thorough coolant replacement—tailored specifically for the 1992 CR500.

What You'll Need

  • Ethylene glycol-based coolant (safe for aluminum radiators)
  • Drain pan
  • 8mm or 10mm socket and wrench (check your drain bolt size)
  • Flathead screwdriver
  • New water pump crush washer (Honda part #90463-ML7-000 is recommended for best seal)
  • Funnel
  • Rags and safety gloves

Step-by-Step Coolant Change Process

  • Allow the engine to cool completely.
    The CR500 cooling system operates under pressure—never open the radiator cap when hot.
  • Remove the radiator cap.
    Use a rag in case of any pressure left. Locate the cap on top of the left-side radiator.
  • Locate the coolant drain bolt.
    The drain bolt is often on the water pump cover, low on the right side of the engine. Place your drain pan underneath.
  • Remove the drain bolt and washer.
    Let the old coolant fully drain into your pan. Inspect the old washer and replace it with a new one to prevent future leaks.
  • Flush (optional but recommended):
    Pour clean distilled water into the radiator, re-install drain bolt temporarily, start the engine for a few seconds, then drain again. Repeat if coolant appeared dirty.
  • Re-install drain bolt and new crush washer.
    Tighten securely, but do not overtighten.
  • Fill with new coolant.
    Slowly fill the radiator to the base of the filler neck. Use only coolant labeled safe for aluminum radiators.
  • Bleed air from system.
    With the cap off, tilt and gently rock the bike to encourage air bubbles to escape.
  • Start the engine and allow it to warm up.
    Keep the radiator cap off while running for a couple of minutes—watch for the coolant level dropping as trapped air escapes. Top off as needed.
  • Reinstall radiator cap.
    Once satisfied the coolant is topped off and bubbles have stopped, install the cap securely.
  • Check for leaks and verify system function.
    Inspect the drain bolt, hoses, and radiator for any leaks with the engine running. After the bike cools down, double-check the coolant level and top off if needed.

CR500-Specific Tips

  • This model uses aluminum radiators—regular green or silicate-based car coolant is not recommended. Always use a motocross-specific, ethylene glycol-based coolant to protect against corrosion and pitting.
  • Inspect and carefully reinstall the radiator cap seal; the high compression of the 500cc engine can reveal even small leaks.
  • There is no overflow bottle on the 1992 CR500, so overfilling the radiator will only lead to coolant venting onto the ground. Fill only to the bottom of the filler neck.
  • Never use tap water to flush or mix—minerals can damage the cooling system.

Service Interval Notes

  • Honda recommends changing coolant every two years, or more frequently if you ride in extreme or muddy conditions.
  • If you suspect the coolant is contaminated or the bike overheated, flush the system completely before refilling.

With these steps, your 1992 Honda CR500 will stay cool and dependable for every ride. Keeping your cooling system maintained is cheap insurance against overheating and costly engine repairs.

Related Shopping Categories

Shop Radiators for a 1992 Honda CR500 Dirt Bike.

Shop Coolant for a 1992 Honda CR500 Dirt Bike.

Shop Temperature Sensors for a 1992 Honda CR500 Dirt Bike.

Shop Tools for a 1992 Honda CR500 Dirt Bike.

Shop Radiator Hoses for a 1992 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.