How to Change the Coolant in a 1987 Honda XR250R: Essential Guide

Shop parts for a 1987 Honda XR250R Dirt Bike.

The 1987 Honda XR250R is a classic, rugged dirt bike admired for its reliability and straightforward engineering. Changing the coolant is crucial for maintaining its air-cooled and oil-cooled engine's longevity and efficiency, especially if you ride in demanding conditions. Here's a proprietary MotoSport guide designed specifically for your XR250R.

What Makes the 1987 Honda XR250R Unique?

The 1987 XR250R features Honda's well-known simplicity: a four-stroke, air-cooled single with an oil cooler. Unlike typical modern liquid-cooled engines, this model does not have radiators or a pressurized coolant system. However, if later modifications have equipped your bike with an aftermarket liquid-cooling system, or you're servicing oil cooler lines, the procedures below can help.

Required Tools & Supplies

  • Approved ethylene glycol-based coolant (if you have a modified, liquid-cooled model)
  • Catch pan
  • Funnel
  • Rags and gloves
  • Socket wrench set
  • New crush washer for drain bolt

Step-by-Step Coolant Change Procedure

  1. Preparation
    • Ensure the engine is cool.
    • Stand the bike upright on a level surface.
    • If your XR250R is air/oil-cooled only (factory configuration), you do not need to carry out a coolant flush–focus on oil and filter servicing instead.
    • If you have a modified or swapped radiator-equipped model, continue below.
  2. Drain the Coolant
    • Remove the radiator cap–this releases any system pressure and helps the coolant drain freely.
    • Locate the coolant drain bolt, usually at the lowest point of the water pump or bottom of the radiator.
    • Place your catch pan under the drain area.
    • Loosen and remove the drain bolt as well as any bleeder screw, allowing all old coolant to escape. Moving the bike gently side-to-side helps clear trapped fluid.
    • Inspect or replace the crush washer before reinstalling the bolt.
  3. Flush (Optional but Recommended)
    • Add distilled water to the system, then reinstall the drain bolt and briefly run the engine, letting it cycle through (do not let it overheat).
    • Drain the water. Repeat until it runs clear.
  4. Add New Coolant
    • Double-check that the drain plug is securely installed.
    • Slowly fill the radiator or tank with a safe, ethylene glycol-based coolant designed for aluminum (do not use straight water or "universal" coolant).
    • Lightly tap hoses and gently lean the bike side-to-side to help burp out air pockets.
    • Fill to the recommended level, usually just below the filler neck.
  5. Bleed Air & Final Inspection
    • Start the bike and let it idle, watching for bubbles and the coolant level dropping as air exits.
    • Shut off the engine, top off coolant as needed, and reinstall the radiator cap securely.
    • After a short ride and complete cool-down, check the coolant again and top off if needed.

Model-Specific Notes for 1987 XR250R Owners

  • Factory XR250R: The 1987 model relies on an oil cooler with no factory coolant system. Routine oil and filter changes, checking for oil cooler leaks, and keeping cooling fins clean are the best measures for keeping temperatures under control.
  • Aftermarket or Swapped Engines: Some bikes may have custom or CRF-style radiators. Always use a Honda-spec ethylene glycol coolant for aluminum engines and never overfill. Watch for leaks around custom hose connections.
  • Overheating: If your stock XR250R runs hot, inspect the oil system, ensure proper oil levels, and clean any debris from engine cooling fins for optimal air cooling.

Pro Tips

  • Upgrade with modern, silicone coolant hoses if your build includes radiators.
  • Always dispose of old coolant responsibly–never pour it down drains or onto the ground.
  • Check your manual for any torque specifications on drain bolts and cap installation to avoid overtightening.

Regular service keeps your classic XR250R running for years. For authentic replacement parts, performance upgrades, and fluids made for your vintage Honda, trust MotoSport to supply everything you need.

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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.