How to Change the Coolant in a 2017 Honda CRF150R Big Wheel

Shop parts for a 2017 Honda CRF150R Big Wheel Dirt Bike.

Changing the coolant in your 2017 Honda CRF150R Big Wheel (CRF150RB) is a vital maintenance task that extends the life of your engine and ensures reliable cooling on the track or trail. This expert MotoSport guide details every step for a thorough, mess-free coolant change, including unique tips for the Big Wheel model.

Why Change the Coolant?

  • Fresh coolant prevents overheating and corrosion inside your engine
  • The CRF150R's high-revving, race-bred engine generates considerable heat, making cooling system maintenance especially critical
  • Honda recommends replacing coolant every two seasons of use or sooner for hard-ridden bikes

Tools and Supplies Needed

  • New coolant (use only high-quality, silicate-free motorcycle coolant; avoid automotive coolant)
  • Distilled water (for flushing, if desired)
  • 8 mm and 10 mm sockets or wrenches
  • Drain pan
  • Clean rags
  • Funnel
  • Protective gloves and eyewear

CRF150RB-specific Notes

  • The Big Wheel shares its engine and cooling system with the standard CRF150R but features a higher seat and 19” front/16” rear wheels
  • Coolant capacity: approximately 0.8 US quarts (0.76 liters); it is critical not to overfill
  • Designed for competition use only–never operate this bike on public roads

Step-by-Step Coolant Change Procedure

  1. Allow the engine to cool completely
    Never attempt to change coolant while the engine is hot to avoid burns.
  2. Remove the right radiator shroud
    Use a 8 mm socket to remove the bolts and gain access to the radiator cap.
  3. Position your drain pan beneath the water pump
    Locate the coolant drain bolt (typically an 8 mm bolt) on the bottom of the water pump cover (right side of the engine).
  4. Remove the radiator cap
    Gently twist counterclockwise. Removing the cap first allows faster drainage.
  5. Remove the coolant drain bolt and sealing washer
    Let all the old coolant drain completely. To evacuate more fluid, loosen the bleed bolt on the top or side of the cylinder head.
  6. Flush (optional but recommended)
    For a clean system, pour distilled water into the radiator, reinstall the drain bolt loosely, and briefly turn over the engine (with ignition off) to circulate and rinse. Drain again.
  7. Replace and tighten the drain bolt and sealing washer
    Ensure the washer is in good condition to prevent leaks. Torque to specification (if available).
  8. Fill with new coolant
    Pour in coolant slowly, allowing air bubbles to escape. Fill to the top of the radiator filler neck.
  9. Eliminate trapped air
    With the cap off, gently rock or tap the bike side-to-side to help air rise. Kick the engine over by hand (do not start) to circulate fluid and release air pockets. Top off coolant as needed.
  10. Install the radiator cap
    Tighten securely.
  11. Start and gently warm up the engine
    Allow the bike to reach operating temperature. Shut off and let cool, then re-check and top off coolant if required.
  12. Inspect for leaks and reinstall the radiator shroud

Owner Tips for the CRF150R Big Wheel

  • This model is engineered for track and closed-course use only—its cooling system is compact but highly efficient under race conditions
  • Always monitor coolant level before long motos, as extreme riding can increase consumption or losses from minor leaks
  • Stick with Honda HP Coolant or a high-quality equivalent for maximum protection of internal aluminum parts

Dispose of Used Coolant Safely

Never pour coolant down the drain or onto the ground. Take used fluid to your local recycling or hazardous waste center.

Regular coolant maintenance protects your CRF150RB's engine investment and ensures race-winning reliability–whether you're on the gate or exploring the trails.

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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.