How to Change the Coolant in a 2019 Honda CRF150R
Shop parts for a 2019 Honda CRF150R Dirt Bike.
Maintaining the correct coolant level and quality in your 2019 Honda CRF150R is essential for optimal performance and engine longevity, especially given the high revving nature and compact radiator design of this competition-ready mini motocrosser. Follow this MotoSport.com exclusive guide for the correct procedure, safety tips, and specific notes for this model.
Why Coolant Maintenance Matters for the CRF150R
The CRF150R's high-output liquid-cooled engine generates significant heat, and any lapse in coolant condition can quickly lead to overheating and internal damage. Regular coolant service enhances performance and safeguards engine life, critical for bikes used in MX or high-intensity trail conditions.
What You’ll Need
- Phillips screwdriver
- 8mm socket or wrench
- Coolant drain pan
- Funnel
- Fresh coolant (use a high-quality, premixed motorcycle coolant–avoid plain water or car antifreeze)
- Distilled water (for optional flush)
- Protective gloves and eyewear
- Shop towels
Step-by-Step Coolant Change Instructions
- Ensure the engine is completely cool. Never attempt to open the radiator cap on a hot engine.
- Remove the radiator cap located atop the left side radiator. This relieves any residual pressure, allowing coolant to drain freely.
- Position your drain pan below the water pump. Locate the lowest bolt on the water pump cover on the right side of the engine (8mm). This is the designated coolant drain bolt.
- Remove the drain bolt and washer with care. Once loose, coolant will begin to flow out–aim to catch all used fluid in your pan and avoid skin contact.
- Allow the coolant to drain completely. Tilting the bike slightly or removing the radiator cap may expedite the process.
- Optional flush: For extra cleanliness, with the drain bolt out, pour distilled water into the radiator until it runs clear from the drain. This removes old residue or debris. Allow all flush water to drain fully before proceeding.
- Reinstall the drain bolt with a fresh sealing washer if necessary. Tighten the bolt securely, but do not overtighten–the water pump cover is made of aluminum and can strip under excess force.
- Pour new coolant slowly into the radiator through a funnel. Fill until the coolant touches the lower edge of the radiator filler neck.
- Burp the system: Gently rock the bike side to side or squeeze the radiator hose to release air pockets. Top off as needed and reinstall the radiator cap securely.
- Start the engine and let it idle for 3-5 minutes. Watch for leaks at the drain bolt and water pump. Turn the engine off and let it fully cool before checking the coolant level again. Top off if necessary.
Special Notes for 2019 Honda CRF150R Owners
- Cooling system capacity: Refer to your owner's manual for the precise amount; do not overfill.
- Observe for residue or low coolant after first ride. The CRF150R's narrow radiator and high-revving engine are less forgiving of air pockets–always recheck after cool-down following your initial ride.
- Replace with compatible coolant. Silicone silicate-based formulas can damage magnesium engine parts found in the CRF150R. Use a coolant specified for modern motocross models.
- Inspect hoses and clamps during each coolant service for cracks or looseness–prevention is easier than mid-moto failure.
Environmental & Safety Reminders
- Dispose of old coolant responsibly. Never pour it on the ground or into drains–recycle at a proper automotive waste facility.
- Coolant is toxic to pets and wildlife.
Stay on top of maintenance and keep your CRF150R running at peak performance between motos with the help of MotoSport.com.
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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.