How to Change the Coolant in a 2026 Honda CRF125FB: Step-by-Step Guide
Shop parts for a 2026 Honda CRF125FB Dirt Bike.
Routine coolant changes are essential for keeping your 2026 Honda CRF125FB performing at its best, preventing overheating, and extending the life of your engine. This guide explains how to change your coolant safely – and highlights key notes for this model—so you ride with confidence.
1. Prep Your Work Area & Bike
- Park the CRF125FB on a level surface, and allow the engine to cool completely.
- Gather tools: 8mm and 10mm sockets, Phillips screwdriver, drain pan, replacement coolant (Honda Type 2 or equivalent silicate-free coolant), funnel, clean rags, and a new crush washer for the drain bolt.
- Remove the right side panel and radiator shroud to access the radiator cap and drain bolt.
2. Drain the Old Coolant
- Place the drain pan beneath the water pump area—the drain bolt is located on the right bottom side of the engine near the water pump.
- Carefully remove the radiator cap (ensure the engine is completely cool to avoid injury).
- Loosen and remove the drain bolt and crush washer, allowing all coolant to drain fully.
- If your model has a coolant reservoir, drain it by disconnecting the hose or removing the reservoir if necessary.
3. Inspect & Reinstall
- Inspect the old washer; replace it with a new crush washer to prevent leaks.
- Reinstall and tighten the drain bolt according to Honda torque specifications – do not overtighten.
4. Fill with Fresh Coolant
- Pour silicate-free coolant directly into the radiator up to the base of the filler neck. Honda recommends a 50/50 mix of antifreeze & distilled water if not using premixed coolant.
- If there is a reservoir, fill to the MAX mark.
5. Bleed the System & Check for Leaks
- With cap off, briefly start the engine and allow it to idle for 30 seconds to purge trapped air. Shut off and let settle.
- Top off the radiator as needed, reattach the radiator cap, and recheck the reservoir.
- Run the bike up to operating temperature with the cap on, shut it down, and once cool, check and adjust the coolant level again if necessary.
6. Reassemble & Dispose Properly
- Reinstall the plastic panels and shrouds.
- Dispose of old coolant at a certified recycling facility.
Model-Specific Notes for the 2026 CRF125FB
- Drain bolt location on the CRF125FB is easy to access – no need to strip the bike down to the frame.
- Expansion tube is routed so that any overfilled coolant is safely discharged under the engine. Do not overfill.
- This model's design means routine changes are quick: Honda's compact layout allows easy maintenance with minimal disassembly.
- Only use silicate-free, OEM-approved coolant to protect the aluminum components and gaskets unique to this engine series.
By keeping your CRF125FB's cooling system maintained, you help safeguard cylinder, head, and gasket integrity ride after ride. Check your owner's manual for coolant change intervals and recommended fluids.
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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.