How to Change the Coolant in a 2020 Honda CRF250F
Shop parts for a 2020 Honda CRF250F Dirt Bike.
Maintaining your Honda CRF250F's cooling system is vital for reliable engine performance and longevity. Coolant should be changed every two years, or sooner if you hit 24,000 miles, to keep the engine running at optimal temperature and prevent internal corrosion. The process is straightforward and ideal for riders comfortable with basic maintenance.
Required Tools & Supplies
- 5mm allen key (for most panel bolts)
- 8mm and 10mm sockets
- Ratchet
- Phillips screwdriver
- Paper towels or shop rags
- Silicate-free, pre-mixed 50/50 coolant rated for aluminum engines
- New crush washer for the drain bolt (recommended)
- Catch pan
- Funnel
Step-by-Step Guide
- Preparation:
- Ensure the engine is completely cool before starting. Hot coolant can cause severe burns if the system is opened under pressure.
- Place the bike upright on a stand and remove the seat and side panels (as required) for improved access to the radiator and coolant reservoir.
- Access the Radiator:
- Locate the radiator and carefully remove the radiator cap using a Phillips screwdriver as needed. Always open the cap slowly with a rag to avoid sudden pressure release.
- Drain the Old Coolant:
- Place a catch pan under the radiator area. Remove the coolant drain bolt (usually located at the bottom of the water pump or radiator) using the appropriate socket. Replace the crush washer if available for optimal sealing.
- Allow all coolant to fully drain from the system. Some models may require tilting the bike slightly to help draining.
- Flush (Optional):
- If the old coolant is severely discolored or contaminated, you can flush the system with distilled water. Reinstall the drain bolt temporarily, fill with distilled water, run the engine briefly, then repeat the draining step.
- Reinstall Drain Bolt:
- Once the system is drained, reinstall the drain bolt with a new crush washer to prevent leaks. Tighten to manufacturer specification, being careful not to overtighten.
- Add New Coolant:
- Using a funnel, pour fresh silicate-free 50/50 coolant into the radiator until it reaches the bottom of the filler neck. Double-check for the correct coolant type – Honda engines prefer non-silicate, non-borate coolant for long-term aluminum protection.
- Bleed Air from System:
- Leave the radiator cap off and start the engine. Let it idle until the thermostat opens and air bubbles stop appearing at the filler neck. Top up coolant as needed. Shut off the engine, let it cool slightly, then recheck and top off.
- Check Levels & Reassemble:
- Once coolant stays at the correct level, securely reinstall the radiator cap. Repeat checks for leaks around the drain bolt and radiator area. Replace any removed bodywork.
Important Notes for the 2020 CRF250F
- The coolant capacity for the CRF250F is approximately 1 quart at full disassembly and slightly less for a change. Overfilling can lead to overflow, so stop once the coolant reaches the base of the radiator filler neck.
- Routinely inspect for coolant loss: a minor loss of about 0.7 – 2.0 ounces through the overflow is normal. Excessive loss indicates a possible leak or cooling system issue.
- If the coolant appears rusty or milky, further inspection is advised as this can indicate a head gasket or corrosion issue.
- Always ensure the radiator cap is fully and securely installed after service. An improperly seated cap can cause overheating and loss of coolant – directly risking engine health.
After-Service Checklist
- Start the bike, let it reach full operating temperature, and observe for leaks.
- Allow the engine to cool, then check coolant level once more and top off if necessary.
- Dispose of used coolant responsibly, complying with local environmental regulations.
Regular coolant changes help your CRF250F run cooler, last longer, and deliver consistent performance – on the trail or track. Always stick to the correct coolant and Honda service intervals to safeguard your investment.
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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.