How to Change the Coolant in a 2020 Honda CRF150R: A MotoSport Guide

Shop parts for a 2020 Honda CRF150R Dirt Bike.

Routine coolant changes are crucial for optimal performance and engine longevity on your 2020 Honda CRF150R. This guide details every step specifically for your bike, highlighting model nuances every CRF150R owner should know before hitting the trails or track.

What You’ll Need

  • Pro Honda HP Coolant or equivalent high-quality pre-mixed coolant (silicate-free, designed for aluminum radiators)
  • 10mm or 8mm socket or wrench (for drain bolt, confirm with your own bike’s bolt size as manufacturers may adjust across years)
  • Drain pan
  • Funnel
  • Distilled water (for flushing, optional but recommended)
  • Shop towels and gloves

Step-by-Step Coolant Change Procedure

  1. Let the bike cool. Never attempt to open the radiator cap while the engine is hot. Wait until the engine is completely cool to prevent burns and ensure safe coolant handling.
  2. Remove the radiator cap. Find the radiator cap on the top left side of your CRF150R. Carefully press down and turn counterclockwise to remove it, releasing pressure slowly.
  3. Position the drain pan. Place the drain pan directly under the water pump. The drain bolt is located at the lowest point of the water pump housing on the right side of the bike–look for a small bolt, often with a copper washer.*
  4. Remove the drain bolt. Use your socket or wrench to loosen and remove the drain bolt. Coolant will begin to flow into your pan. To increase the flow and fully drain the radiators, confirm the radiator cap is off.*
  5. Flush the system (optional but recommended for maintenance). With the drain bolt still out, pour distilled water into the radiator filler neck. Allow it to flow out until only clear liquid drains.–Repeat as needed for a thorough flush.
  6. Reinstall the drain bolt. Ensure the washer is in good condition and refit the drain bolt by hand, then snug it with your wrench. Do not overtighten–just secure to avoid damaging threads.
  7. Refill with new coolant. Slowly pour coolant into the radiator until it reaches the filler neck. Check the owner’s manual for specific capacity information; be sure not to overfill.
  8. Bleed the system. Gently rock the bike or carefully squeeze the radiator hoses to release trapped air bubbles. Add more coolant if the level drops.
  9. Reinstall the radiator cap. Replace the cap securely. Ensure it clicks and locks so it seals properly.
  10. Start the bike and warm it up. Let the engine run briefly (2-3 minutes), watch the temperature, then shut off. Allow it to fully cool. Double-check coolant level and top off as needed.

Model-Specific Tips for the 2020 Honda CRF150R

  • Coolant Recommendation: Honda recommends Pro Honda HP Coolant or an equivalent, silicate-free blend for aluminum alloy radiators.–Don’t use automotive coolant designed for steel or copper systems, as it can damage your bike’s components.*
  • Overflow & Maintenance: The CRF150R includes a radiator overflow tube.–After a coolant change or heavy ride, check the overflow reservoir and add coolant if it is below the minimum mark.
  • Regular Checks: After your first ride or two, always recheck the coolant level once the engine is fully cool. Dirt bikes can burp out air on the first few heat cycles, dropping the level below optimal.*
  • Competition Use: For race or high-performance riding, inspect hoses, clamps, and the water pump during coolant changes for any leaks or wear unique to the rigors of competition setups.
  • Main Drain Bolt Detail: The lower bolt on the water pump is the dedicated coolant drain for this model. Do not remove other bolts unnecessarily–they seal other parts of the pump and engine.

Keeping your CRF150R’s cooling system fresh is as important as regular oil changes—protect your investment, ride harder, and stay confident on the trail or track.

Ready to tackle maintenance yourself or need replacement parts? Shop parts for a 2020 Honda CRF150R Dirt Bike.

*Be sure to consult your owner’s manual for model-specific torque specs, recommended capacities, and any safety warnings.

Related Shopping Categories

Shop Radiators for a 2020 Honda CRF150R Dirt Bike.

Shop Coolant for a 2020 Honda CRF150R Dirt Bike.

Shop Temperature Sensors for a 2020 Honda CRF150R Dirt Bike.

Shop Tools for a 2020 Honda CRF150R Dirt Bike.

Shop Radiator Hoses for a 2020 Honda CRF150R Dirt Bike.

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.