How to Change the Coolant in a 2020 Honda CRF250L: The Complete Guide

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Proper coolant maintenance is vital for the Honda CRF250L, ensuring smooth performance and cooling efficiency during demanding trail rides or daily commutes. Here–s a proprietary MotoSport guide tailored to 2020 CRF250L owners for replacing your coolant safely and efficiently.

Why Change the Coolant?

Routine coolant changes flush out old, degraded fluid that can corrode and clog passageways. For the 2020 Honda CRF250L, follow the manufacturer–s advice: change coolant every two years or 24,000 miles, whichever comes first, for optimal protection.

Tools & Supplies Needed

  • Silicate-free motorcycle coolant with corrosion inhibitors
  • Funnel
  • 5mm Allen key
  • 8mm and 10mm sockets
  • Ratchet
  • Phillips head screwdriver
  • Replacement crush washer (for drain bolt)
  • Paper towels/rags for cleanup
  • Small container for used coolant

Step-by-Step Instructions

  1. Preparation
    Ensure the engine is completely cool before beginning. Prop the bike securely on a stand for safety. Remove the key from ignition.
  2. Remove Plastics and Access Radiator
    - Left side: Remove the top 5mm Allen screw at the radiator shroud.
    - Right side: Remove four screws and two plastic retainers to take off the side shroud.
    - If equipped with an aftermarket skid plate, use the appropriate tool to remove it and gain full access.
  3. Remove Reservoir Bolts
    Use a 10mm socket to detach the reservoir gently. Avoid spilling coolant.
  4. Remove Radiator Cap
    Remove the Phillips screw securing the radiator cap, then carefully unscrew and set aside the cap.
  5. Drain Old Coolant
    - Locate the coolant drain bolt near the bottom of the water pump.
    - Place a suitable container underneath.
    - Remove the drain bolt (8mm) along with its crush washer. Allow all coolant to drain.
  6. Install New Crush Washer
    Replace the crush washer before reinserting and tightening the drain bolt. This prevents leaks and ensures a proper seal.
  7. Flush (Optional but Recommended)
    If the old coolant appears dirty or contaminated, flush the system with distilled water before adding new coolant. Repeat the drain process if you flush.
  8. Refill System
    - Using a funnel, pour fresh silicate-free coolant into the radiator until full.
    - Fill the reservoir to the MAX line, but do not overfill.
  9. Remove Air Pockets
    With the cap off, briefly start the engine and let it idle for a minute, allowing air bubbles to work out. Shut off and top off coolant as needed. Never let the engine run without coolant or run hot.
  10. Install All Removed Parts
    Reinstall and tighten the radiator cap, plastics, and reservoir bolts.
    If you have a skid plate, reinstall it.
  11. Final Checks
    Wipe away any spills. Check under the bike for leaks. Recheck coolant level after first ride and top off if needed.
    Dispose of old coolant responsibly—do not pour it down drains.

Special Notes for the CRF250L Owner

  • This model requires silicate-free coolant to preserve water pump and gasket integrity.
  • Never mix different coolant types—drain, flush, and replace entirely if switching products.
  • Inspect hoses and radiator for leaks or aging. CRF250Ls are durable, but hoses can degrade over time, especially in off-road conditions.
  • If you ride in hot climates or heavy mud, consider coolant changes more frequently.
  • Always use a new crush washer at the drain bolt—a reusable one may not seal and can lead to leaks.

Ready for Your Next Adventure?

Keeping your 2020 Honda CRF250L coolant fresh ensures your bike runs cool and reliable, season after season. For factory-quality parts, quality coolant, or tools specific to your Honda, remember:

Shop parts for a 2020 Honda CRF250L Dirt Bike.

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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.