How to Change the Coolant in a 2012 Honda CRF150R

Shop parts for a 2012 Honda CRF150R Dirt Bike.

Regular coolant replacement is crucial for your 2012 Honda CRF150R to maintain optimal engine temperatures and prevent overheating, especially during hard moto sessions. This guide will walk you through the proprietary MotoSport process for changing the coolant, as well as highlight considerations unique to the CRF150R model.

What You Will Need

  • New coolant compatible with aluminum radiators (silicate-free; Honda recommends their premixed coolant for motocross bikes)
  • Distilled water (for flushing, if needed)
  • A drain pan
  • 8mm socket or wrench
  • Funnel
  • Shop towels
  • Personal protective equipment (gloves – optional, but recommended)

Preparation

  • Allow the engine to fully cool before starting. Never open the radiator cap while the engine is hot.
  • Place your CRF150R on a stand or level ground for stability.

Drain the Old Coolant

  • Remove the right radiator shroud for easier access.
  • Loosen the radiator cap slowly to relieve any residual pressure, then remove the cap.
  • Place a drain pan under the water pump. Locate the coolant drain bolt – it's the *lowest* bolt on the water pump cover.
  • Using the 8mm socket, remove the drain bolt and the small copper washer behind it. Allow all old coolant to drain out.
  • For a thorough flush, reinstall the drain bolt, fill the system with distilled water, repeat the drain process, then remove the bolt again.

Refilling with Fresh Coolant

  • Replace the copper washer if it's damaged to help prevent leaks.
  • Reinstall and tighten the drain bolt; do not overtighten.
  • Using the funnel, slowly fill the radiator with new coolant until it reaches just below the filler neck.

Eliminating Air Pockets

  • With the radiator cap off, slowly kick over the engine several times by hand. This helps the water pump circulate coolant and releases trapped air bubbles.
  • Top off the coolant if the level drops after air is released.
  • Reinstall the radiator cap securely; ensure you feel both clicks to lock it down properly.

After Service Tips

  • Start the bike and let it idle until warm, then shut it off and let it cool completely.
  • Check the coolant level again, topping off if necessary. Air pockets sometimes work their way out after a short ride.
  • Inspect for leaks around the drain bolt, hoses, and radiator cap.

Special Considerations for the 2012 CRF150R

  • The high-revving, small-displacement engine of the CRF150R is engineered for racing and can generate intense heat. Always use coolant formulated for motocross bikes to ensure corrosion resistance and optimal heat transfer.
  • Overfilling the radiator can cause overflow through the expansion tube. Fill only to the recommended level.
  • Monitor coolant levels frequently, especially after the first ride post-service.
  • Check hoses and the radiator cap for any signs of wear, which can lead to leaks and overheating — frequent issues with high-performance mini motocrossers.

Taking these steps will keep your Honda CRF150R cooled correctly and ready for aggressive riding. Performing routine coolant service not only extends engine life but ensures every lap is consistent & reliable from moto to moto.

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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.