How to Change the Coolant in a 2016 Honda CRF250L

Shop parts for a 2016 Honda CRF250L Dirt Bike.

Regularly servicing the cooling system of your 2016 Honda CRF250L ensures consistent performance, improved longevity, and peace of mind during aggressive trail or street sessions. Honda recommends changing the coolant every 24,000 miles or every two years, whichever comes first. The process is straightforward – even for riders new to maintenance – with a few unique quirks specific to the CRF250L family.

What You Will Need

  • 50/50 silicate-free coolant (with added corrosion inhibitors, premixed is recommended)
  • Funnel
  • 5mm Allen key
  • 8mm and 10mm sockets with a ratchet
  • Phillips head screwdriver
  • Replacement crush washer for the radiator drain plug
  • Drain pan – to capture old coolant
  • Gloves and paper towels

Steps for Changing Your CRF250L's Coolant

  1. Let the bike cool completely. Never work on a hot cooling system – pressurized coolant can cause burns.
  2. Remove radiator shroud panels:
    • Use the 5mm Allen to remove the upper screw on the left (radiator) side.
    • On the right, remove four screws and two plastic retainers to free up access to the reservoir and radiator cap zone.
  3. Detach coolant reservoir (if required for access):
    • Use the 10mm socket for two bolts securing the reservoir.
    • Place aside carefully without pulling on hoses.
  4. Remove the radiator cap:
    • Loosen the set screw with a Phillips to free the cap, then gently remove the cap to relieve pressure.
  5. Locate and remove the coolant drain bolt:
    • Find the 8mm drain bolt on the water pump housing (bottom right of the engine).
    • Place your pan beneath – remove the bolt and allow all coolant to drain completely. Remove the reservoir cap too, so fluid drains freely.
    • Important: Replace the old crush washer with a new one to prevent leaks at the drain plug.
  6. Flush if heavily contaminated (optional):
    • You can flush the system with distilled water until it runs clear, especially if old coolant was dirty or discolored.
  7. Reinstall the drain bolt (with new crush washer). Tighten securely, but do not overtighten (snug with a short-handled ratchet is ideal).
  8. Fill the radiator:
    • Slowly pour new 50/50 coolant into the radiator with a funnel until full.
    • Fill the reservoir to the upper line as well.
  9. Bleed air from the system:
    • Start the engine and let it idle with the radiator cap off. Add coolant as the level drops (do not let it splash or overheat).
    • Blip the throttle gently to help purge air. Once bubbles stop and the level stabilizes, shut the bike off.
    • Top off radiator if necessary, then reinstall the radiator cap and set screw.
    • Check and adjust the reservoir again.
  10. Reinstall plastics and the coolant reservoir in reverse order of removal.
  11. Check for leaks after the first ride—especially at the drain bolt and hose connections.

CRF250L Model-Specific Notes

  • The radiator shrouds and plastics are designed for quick removal but handle them carefully to prevent cracking mounting tabs.
  • Use OEM-style crush washers for the drain bolt each time – re-using old washers can cause persistent leaks.
  • Honda specifies a silicate-free coolant only to avoid internal damage and maximize cooling performance.
  • For CRF250L models with aftermarket skid plates, additional removal may be needed for direct access to fasteners.
  • Always verify the coolant reservoir level after cool-down – top it off if it drops below mid-line after purging air.

Whether prepping for a race or just tackling long highway stints, a fresh coolant change keeps your 2016 CRF250L running reliably and lets you enjoy more rides without worry. Dispose of old coolant responsibly – never pour it down drains or onto the ground.

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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.