How to Change the Coolant in a 2018 Honda CRF250L RALLY

Shop parts for a 2018 Honda CRF250L RALLY Dirt Bike.

Maintaining fresh coolant is critical for the durability and performance of your 2018 Honda CRF250L RALLY. Honda recommends changing the coolant every two years or 24,000 miles–whichever occurs first–to protect against overheating and corrosion. Here is MotoSport's proprietary step-by-step guide to replace the coolant on your MMY dirt bike, with model-specific notes.

Tools & Parts You Need

  • Silicate-free coolant (50/50 pre-mixed)
  • Funnel for controlled pouring
  • 5mm Allen key, 8mm and 10mm sockets with ratchet
  • Phillips head screwdriver
  • Replacement crush washer for the radiator drain bolt (single use)
  • Paper towels for cleanup

Procedure

  1. Remove plastics. Use the 5mm Allen key to remove the top screw on the radiator side panel. On the right, remove four screws and two plastic retainers. If equipped with an aftermarket skid plate, remove it for side panel access.
  2. Access the coolant reservoir and filler. Use the 10mm socket to remove the bolts holding the reservoir. Take out the set screw with the Phillips screwdriver, then remove the radiator cap.
  3. Drain the old coolant. Locate the drain bolt (typically 8mm). Position a drain pan underneath, loosen, and remove the drain bolt to let coolant flow out. Replace the crush washer before reinstalling the bolt, tightening to factory spec.
  4. Flush (optional). If desired, rinse the system with distilled water. Drain completely before proceeding.
  5. Refill with new coolant. Using a funnel, pour the fresh silicate-free coolant into the radiator until full. Fill the reservoir to its upper mark as well.
  6. Bleed air from the system. With the bike reassembled, start the engine and let it idle with the radiator cap off until the coolant level drops and air bubbles escape. Top off as needed, then secure the cap.
  7. Reinstall panels and skid plate. Replace all hardware in reverse order, ensuring a snug fit.

Special Notes for the 2018 Honda CRF250L RALLY

  • This model features a compact radiator and a single drain bolt with crush washer. Always use a new crush washer to prevent leaks after coolant changes.
  • Aftermarket skid plates require extra disassembly. Confirm you have the needed tools for non-stock components.
  • Ride conditions impact service intervals. If you ride in heavy rain, dusty trails, or operate at full throttle, inspect and potentially change coolant more frequently.

After the Change

  • Check for leaks from panels and drain bolt after your first ride.
  • Dispose of old coolant responsibly–it is toxic and must not be dumped into drains or onto the ground.
  • Document your maintenance date for future service tracking and warranty support.

Routine coolant changes protect your engine and ensure peak performance from your Honda CRF250L RALLY on every ride. Use only silicate-free coolant recommended for Honda motorcycles for best results.

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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.