How to Change the Coolant in a 2017 Honda CRF250L RALLY

Shop parts for a 2017 Honda CRF250L RALLY Dirt Bike.

Regular maintenance of your Honda CRF250L Rally includes changing the coolant—a key step to ensure optimal engine cooling and long-term reliability. While Honda recommends replacing the coolant every 24,000 miles or two to three years (whichever comes first), riding habits and environmental factors may make more frequent service ideal. Here’s a detailed, MotoSport-exclusive guide tailored for the 2017 Honda CRF250L Rally owner.

What You’ll Need

  • Silicate-free motorcycle coolant/antifreeze with corrosion inhibitors
  • Funnel
  • 8mm and 10mm sockets with ratchet
  • 5mm Allen key (4mm if you have aftermarket skid plate)
  • Phillips-head screwdriver
  • Replacement crush washer for the drain bolt
  • Catch pan for old coolant
  • Clean rags or paper towels
  • Screw tray to keep track of hardware

Step 1: Prepare the Bike

  • Park the bike on a level surface and let the engine cool completely. Never open the radiator cap on a hot engine--hot coolant can spray and cause burns.
  • Remove the seat and the right side body panel by unfastening the 5mm Allen bolts and any plastic clips. Depending on your setup, you may also need to remove or loosen the skid plate for easier access–aftermarket plates may use different hardware.

Step 2: Drain the Coolant

  • Place a catch pan under the water pump,where the coolant drain bolt is located (typically 8mm). Loosen the radiator cap first using a Phillips screwdriver after removing its set screw; this allows coolant to drain faster.
  • Remove the drain bolt and let the coolant drain completely. Replace the crush washer with a new one before reinstalling the drain bolt to prevent leaks–do not reuse the old washer.
  • Tighten the drain bolt to manufacturer torque spec (consult your service manual for accuracy).

Step 3: Flush (Optional)

  • If the drained coolant appears rusty or contaminated, flush the system with distilled water. Fill, run the engine briefly (with cap on but gently), then drain again before refilling with new coolant.

Step 4: Refill the System

  • Using a funnel, slowly add silicate-free motorcycle coolant into the radiator until full.
  • Fill the coolant reservoir to the indicated upper level. Do not overfill. Replace and secure the radiator cap.

Step 5: Bleed Air and Check for Leaks

  • Start the engine and let it idle with the cap on. As the engine warms, gently rock the bike side to side to help air escape. Shut off after a few minutes, let it cool, and check the coolant level. Top off if needed.
  • Inspect around the drain bolt and hose connections for leaks. Double-check the coolant reservoir level after your first ride as trapped air may escape.

Honda CRF250L Rally-Specific Notes

  • The 2017 CRF250L Rally uses a single radiator system with a user-friendly drain bolt right at the bottom of the water pump, making coolant changes straightforward and quick.
  • Aftermarket parts like larger skid plates may block access; always verify which bolts and panels require removal on your bike before starting.
  • Be cautious with plastic fairings—avoid overtightening fasteners to prevent damage.
  • Honda specifies a silicate-free coolant; using standard automotive coolant can damage seals over time.
  • Proper coolant maintenance is especially important for the CRF250L Rally, as its compact single-cylinder engine relies heavily on efficient cooling when navigating slow technical terrain.

Disposal and Safety

  • Used coolant is toxic; always dispose of it at an approved recycling center. Never pour it on the ground or into drains.

With routine coolant changes, your CRF250L Rally will keep its cool no matter where your next ride takes you.

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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.