How to Change the Coolant on a 2014 Honda CRF150R Big Wheel (CRF150RB)
Shop parts for a 2014 Honda CRF150RB Dirt Bike.
Keeping your 2014 Honda CRF150R Big Wheel’s cooling system fresh is crucial for peak performance on the track or trail. Regular coolant changes protect your engine from overheating and corrosion–especially important for the high-revving, race-bred Unicam engine in the CRF150RB. This guide walks you through a safe, effective, and proprietary MotoSport method for changing the coolant, adding a few special notes specific to the CRF150RB.
What You'll Need
- Fresh, high-quality motorcycle coolant (Honda HP Coolant, or pre-mixed ethylene glycol-based coolant for aluminum engines)
- Distilled water (for flushing, optional)
- Drain pan
- 8mm and 10mm sockets
- Screwdriver
- Clean shop rags
- Gloves and eye protection
Step-by-Step CRF150RB Coolant Change Procedure
- Let the bike cool completely. Never open the radiator while hot to avoid serious burns.
- Remove the right side shroud. Use your socket to unbolt the plastic for better radiator access.
- Position the drain pan beneath the water pump drain bolt. The drain bolt is located at the water pump cover on the right side of the engine.
- Remove the radiator cap. Do this slowly to release any residual pressure.
- Remove the water pump drain bolt and sealing washer. Let all the coolant drain completely. Tilt the bike slightly if needed for a full drain.
- Optional: Flush the system. If the old coolant was dirty, re-install the drain bolt, fill the radiator with distilled water, briefly start the bike (running for under 30 seconds), then shut off, let cool, and repeat the drain process.
- Reinstall and torque the drain bolt securely. Make sure the sealing washer is in place to prevent leaks.
- Pour in fresh coolant slowly until it’s full at the radiator neck. The 2014 CRF150RB takes about 0.80 US quarts (0.76 liters) of coolant. Fill slowly to minimize trapped air.
- Bleed air from the system. Gently rock the bike or squeeze radiator hoses to release trapped air bubbles. Briefly start the engine with the radiator cap off and let it idle until bubbles stop appearing. Top off as necessary.
- Secure the radiator cap and reinstall your shroud. Check for leaks around the drain bolt and radiator.
CRF150RB (Big Wheel) Specific Notes
- The CRF150RB’s performance demands make coolant condition extra important. Overheating can lead to damage of the aluminum cylinder head and Unicam valve train–never skip coolant maintenance.
- Always use a coolant compatible with aluminum radiators and engine parts. Avoid using plain tap water, as minerals can cause corrosion and deposits.
- If you ride in extreme conditions (hot weather, mud, dust), inspect your coolant more frequently.
- Be sure not to overfill the radiator, leaving room for expansion as the engine heats up.
Finishing Touches & Safety
- Wipe up any spilled coolant–it is toxic to pets and wildlife and can be slippery.
- Take the used coolant to an appropriate recycling center or hazardous waste facility. Never pour it on the ground.
- After a ride or two, check your coolant level again and inspect for any signs of leakage.
Changing the coolant in your 2014 Honda CRF150R Big Wheel is straightforward, but essential for engine reliability and longevity–especially given its competition-focused powerplant. Stay proactive, and you’ll keep your ride cool under every condition.
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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.