How to Change the Coolant in a 2024 Honda CRF150R Big Wheel
Shop parts for a 2024 Honda CRF150RB Dirt Bike.
Regular coolant changes keep your 2024 Honda CRF150R Big Wheel running cool under race conditions and during tough trail rides. Follow this MotoSport-exclusive guide for safe and proper coolant servicing tailored to the CRF150RB platform. This procedure applies directly to both the standard and Big Wheel (RB) models—with particular attention to cooling system specifics and maintenance tips important to this year.
What Makes the 2024 CRF150RB Cooling System Unique?
- Purpose-built radiator cap: Always ensure you use the correct cap and gentle torque to avoid warping the neck.
- Cooling capacity: The total system holds 0.76 L (0.80 US qt) of coolant after a full drain, making proper measurement important for engine protection.
- Recommended coolant: Honda strongly advises using only Pro Honda HP Coolant for optimal corrosion resistance and heat transfer.
- Air bleeding and bubble removal are essential due to the head design–trapped air can lead to hot spots and overheating.
Before You Begin
- Coolant (Pro Honda HP Coolant or equivalent, silicate-free premix)
- Drain pan
- 8mm socket/wrench and screwdriver
- Distilled water (for flushing, do not use tap water–it can leave mineral deposits)
- Protective gloves and eyewear
Step-by-Step Coolant Change
- Let the engine cool. Never attempt coolant service on a hot motor–pressure and scalds are serious risks.
- Remove both radiator shrouds for easier access.
- Position the bike upright on a stand. Place a drain pan beneath the right side of the engine, directly under the water pump cover.
- Remove the radiator cap (located at the top of the left radiator). This allows air in for smooth draining.
- Locate the coolant drain bolt. On the right-side engine case (water pump cover), remove the lowest 8mm bolt–coolant will begin to drain.
- Flush the system by reinstalling the drain bolt and pouring distilled water into the radiator, then remove the bolt again. Repeat until clear water emerges–margin of safety for any residual debris. Tighten the drain bolt (typical torque: 9 Nm/80 in-lb).
- Slowly fill the radiator with fresh coolant. Pour until coolant reaches just below the filler neck. Wait a minute or two, allowing air bubbles to rise.
- Bleed trapped air. Gently rock the bike side to side and slowly kick the starter over (ignition off) to circulate coolant through the water pump. Add more coolant as needed until the level is steady at the neck.
- Reinstall the radiator cap securely.
- Start the engine and idle 2-3 minutes. Shut off the bike and let it cool. Remove the cap again to top off as necessary–level often drops after initial circulation. Reapply the cap and check for leaks at all fittings.
Pro Tips for the CRF150RB Big Wheel Owner
- Check coolant regularly, especially after any hard race or trail ride. 2024 models rely heavily on coolant fluid for safe high-RPM operation.
- Flush at least once per season for maximum cooling performance.
- Never substitute tap water in your flushes or mixes–this can cause corrosion or scaling unique to high-output engine designs like the 2024 CRF150RB.
- Inspect hoses and clamps for cracking or leaks during every coolant service. Replace damaged parts immediately with OEM-quality replacements to avoid costly engine repairs.
Riders who follow this guide can expect better cooling efficiency and longer engine life, especially during hard competition or high-heat trail rides. Keep your 2024 Honda CRF150R Big Wheel ready to ride with trusted parts and fluids–and trust MotoSport to provide the essentials for every maintenance session.
Related Shopping Categories
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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.