How to Change the Coolant in a 2001 Honda XR70

Shop parts for a 2001 Honda XR70 Dirt Bike.

The 2001 Honda XR70 is known for its air-cooled engine, which sets it apart from many liquid-cooled dirt bikes. However, if your XR70 has been modified with an aftermarket liquid-cooling kit, or if you are referencing another model, here's a proprietary MotoSport guide to changing the coolant. For stock XR70 owners, regular maintenance focuses on the air-cooling system and checking for oil and air filter cleanliness. Read on for tips unique to the XR70, and step-by-step coolant change instructions if your bike has a compatible cooling system.

Important Note About the XR70

  • Factory XR70 engines are air-cooledno coolant service is required on stock units.
  • If you have a liquid-cooling retrofit kit, follow the below coolant change procedure.
  • Always verify your engine's cooling system type before performing service.

Tools & Supplies Needed

  • Socket wrench set or spanners
  • Screwdriver
  • Drain pan or container for old coolant
  • Funnel and shop rags
  • Distilled water for flushing (optional, but recommended)
  • Coolantuse only ethylene glycol based, aluminum-compatible motorbike coolant
  • Protective gloves and eyewear

Step-by-Step Coolant Replacement

  1. Ensure the engine is cool. Never open a radiator cap on a hot engine to avoid burns and coolant spray.
  2. Remove body panels (if required) to access the radiator and reservoir.
  3. Remove the radiator cap to allow air in, so the system drains freely.
  4. Locate and remove the coolant drain bolt or petcockusually at the lowest point of the radiator or water pump body. Use a drain pan to catch coolant.
  5. Once drained, consider flushing the system:
    • Replace the drain bolt. Pour distilled water into the radiator, run the engine briefly (if possible), then drain again. Repeat until clear.
  6. Reinstall drain bolt (use a new crush washer if available). Tighten to the recommended torque.
  7. Pour fresh coolant into the radiator up to the filler neck using a funnel. Slowly add to reduce air pockets.
  8. Start the engine with radiator cap off. Let it idle until it warms up and the thermostat opens. Top off as the coolant level drops.
    • Rock the bike or gently blip the throttle to help free trapped air bubbles ("burping" the system).
  9. Replace the radiator cap and fill the overflow reservoir to the "max" line if equipped.
  10. Check for leaks. Wipe any spills and inspect hose connections, bolts, and the cap.
  11. Reinstall panels and test. After cooling, recheck coolant levelstop-off if necessary.

XR70-Specific Tips

  • Factory XR70s do not use liquid coolant; periodic oil and filter changes and keeping fins clean are key for longevity.
  • If running an aftermarket cooling kit, keep recordsunique lines, radiators, or water pumps may require specific coolants or care.
  • Avoid mixing coolant types to prevent chemical reactions or reduced performance.

Coolant Change Interval

  • Change coolant every 2 years or after severe riding conditions for optimal performance and corrosion protection.

Safe Disposal

  • Always dispose of old coolant responsibly at an auto parts store or hazardous waste facility. Coolant is toxic to pets and wildlife.

For parts, upgrades, and all maintenance needs for your 2001 Honda XR70, rely on MotoSport's premium inventory and support to keep your ride running strong and cool–no matter how you ride.

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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.