How to Change the Coolant in a 1993 Honda CR500: Complete Owner's Guide

Shop parts for a 1993 Honda CR500 Dirt Bike.

Regular cooling system maintenance on the 1993 Honda CR500 ensures long engine life and consistent performance whether you're racing or riding trails. This step-by-step guideunique to MotoSportdetails how to change coolant in your CR500 and outlines key information every owner should know about this iconic, high-performance 2-stroke.

Why Coolant Maintenance Matters

The 1993 CR500's liquid-cooled engine depends on clean, high-quality coolant for heat management and prevention of internal corrosion. Over time, coolant degrades and can carry contaminants that reduce efficiency and jeopardize the cylinder and water pump in this powerful big-bore.

What You Need

  • Ethylene glycol-based motorcycle coolant (safe for aluminum components)
  • Large drain pan
  • 10mm and 12mm sockets or wrenches
  • Funnel
  • Fresh radiator cap gasket (if worn)
  • Shop towels
  • Distilled water (for flushing, if desired)

Step 1: Prepare the CR500

  • Place the dirt bike on a stable stand with the engine fully cooled.
  • Remove the seat and left radiator shroud for easier access to the radiator cap.
  • Place the drain pan under the water pump, located on the lower right side of the engine.

Step 2: Drain the Old Coolant

  • Slowly open the radiator cap, relieving any pressure.
  • Locate the water pump drain boltusually the lowest bolt on the water pump cover.
  • Remove the drain bolt and gasket, allowing coolant to drain completely into the pan.
  • Tilt the bike slightly side to side to completely empty the system, including the cylinder and radiators.

Step 3: Optional Flush the System

  • Reinstall the drain bolt.
  • Fill the radiator with distilled water.
  • Start the engine and let it idle for a minute. Shut off, cool, then drain again.
  • Repeat until the drained water runs clear. This step is highly recommended if the old coolant appeared dirty or rusty.

Step 4: Refill with New Coolant

  • Inspect and replace the crush washer on the drain bolt if damaged.
  • Tighten the drain bolt to specification (do not overtighten–it is easy to strip aluminum threads).
  • Using a funnel, slowly pour coolant into the radiator until it reaches the base of the filler neck.
  • Rock the bike gently or squeeze the coolant hoses to burp out air pockets.

Step 5: Bleed the System & Final Checks

  • Start the engine and let it idle with the radiator cap off, watching for air bubbles to escape.
  • Top off coolant as the level drops, then reinstall the radiator cap.
  • Check for leaks around the drain bolt, hose clamps, and radiator cap.
  • After a short ride, recheck the coolant level and top off if necessary.

Special Notes for the 1993 CR500

  • This 2-stroke's high-compression motor generates significant heat–never run it with low or old coolant.
  • Honda's large radiators are prone to damage from rock strikes. Inspect guards and shrouds during every coolant change.
  • Be sure to use only ethylene glycol-based coolants compatible with aluminum engines. Mixing coolants or adding regular automotive antifreeze can cause corrosion in the radiators and water pump.
  • The stock radiator cap is 1.1 bar–upgrading to a higher-pressure cap is popular with owners who ride hard, but ensure your system is in perfect condition first.

Coolant Change Interval for the 1993 CR500

  • Honda recommends draining and replacing engine coolant every 2 years or sooner if the bike is used in harsh, wet, or muddy environments.

Caring for your CR500's cooling system is vital for both performance and reliability. Remember, routine maintenance is the best way to protect your classic two-stroke investment and dominate every ride.

Related Shopping Categories

Shop Radiators for a 1993 Honda CR500 Dirt Bike.

Shop Coolant for a 1993 Honda CR500 Dirt Bike.

Shop Temperature Sensors for a 1993 Honda CR500 Dirt Bike.

Shop Tools for a 1993 Honda CR500 Dirt Bike.

Shop Radiator Hoses for a 1993 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.