How to Change the Coolant on a 2019 Honda CRF250L RALLY

Shop parts for a 2019 Honda CRF250L RALLY Dirt Bike.

Keeping your 2019 Honda CRF250L RALLY in top condition means regular coolant changes, as recommended every 2 years or 24,000 miles, whichever comes first. The CRF250L Rally's liquid-cooled engine relies on fresh coolant to operate at peak performance – neglecting this system can lead to overheating or premature engine wear. This guide will walk you through the process step by step with tips unique to your model.

Tools & Supplies Needed

  • Silicate-free 50/50 pre-mixed coolant suitable for aluminum engines
  • Funnel
  • 5mm Allen key
  • 8mm and 10mm socket and ratchet
  • Phillips screwdriver
  • Drain pan
  • Replacement crush washer for the drain bolt (recommended)
  • Paper towels or rags for cleanup

Step 1: Prep Your Bike

  • Allow the engine to fully cool before starting. Hot coolant is under pressure and can burn you.
  • Set your CRF250L Rally on a level surface using its side stand or lift.

Step 2: Remove Necessary Plastics

  • Use a 5mm Allen key to remove the single top screw on the left radiator shroud.
  • On the right side, remove four screws and two plastic retainers to access the coolant reservoir and radiator cap.
  • If equipped, remove any skid plate for easier access to the cooling system – you may require a 4mm Allen key if it is aftermarket.

Step 3: Locate and Remove the Radiator Cap

  • Use a Phillips screwdriver to remove the set screw retaining the radiator cap.
  • Remove the radiator cap to relieve system pressure (only once the engine is cool).

Step 4: Drain the Old Coolant

  • Position a drain pan under the bike beneath the water pump area (right side, lower engine).
  • Locate the coolant drain bolt (often marked with a small arrow); typically this is an 8mm bolt.
  • Loosen and remove the bolt. Let all coolant fully drain out. Remove the coolant reservoir cap and tilt the bike gently if needed to ensure complete drainage.
  • Replace the old crush washer with a new one – this ensures a leak-free seal.
  • Re-tighten the drain bolt securely, but do not overtighten.

Step 5: Flush & Check (Optional but Recommended)

  • If your old coolant looked dirty, flush the system with distilled water before refilling.
  • Do not use tap water – minerals may damage your cooling system over time.

Step 6: Add New Coolant

  • Using a funnel, slowly fill the radiator with fresh coolant until it nearly reaches the top of the neck.
  • Fill the coolant reservoir between its minimum and maximum marks.
  • Reinstall the radiator cap and screw, the right-side shroud, and any other plastics removed.

Step 7: Burp the Cooling System

  • Start the engine and let it idle with the radiator cap off (if safe to do so) until the fan cycles once or the coolant begins to flow.
  • Turn off the bike, top up the radiator and reservoir as needed (trapped air may lower the fluid level initially).
  • Reinstall the radiator cap securely.

Step 8: Final Checks

  • Inspect for leaks from the drain bolt, hoses, and around the radiator cap.
  • Double-check your coolant reservoir over the next few rides and top up as needed.

CRF250L Rally Owner Tips

  • The 2019 CRF250L Rally uses a compact, liquid-cooled 250cc engine built for durability & off-road performance. The cooling system is robust but requires maintenance to prevent overheating under high trail loads.
  • Always use a silicate-free coolant – silicates can abrade water pump seals and cause premature failure.
  • If riding in extremely cold or hot conditions, check your coolant's freeze and boil-over protection.
  • The crush washer on the drain bolt is a single-use part. Using a worn washer risks leaks and contamination.
  • Honda's long change interval reflects the cooling system's reliability, but any sign of rust, murky fluid, or overheating merits an immediate coolant refresh.

Routine coolant changes are simple, keep your engine protected, and help deliver the legendary reliability expected of Honda's CRF dual-sport range.

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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.