How to Change the Coolant in a 2017 Honda CRF125FB

Shop parts for a 2017 Honda CRF125FB Dirt Bike.

Properly maintaining your 2017 Honda CRF125FB involves servicing the cooling system at regular intervals. Changing the coolant maximizes cooling efficiency, extends engine lifespan, and ensures reliability on the track or trail. This guide is designed exclusively for MotoSport customers and covers everything you need to know about replacing the coolant in this specific mini dirt bike model.

What Youll Need

  • Silicate-free motorcycle coolant (pre-mixed or mix with distilled water as specified)
  • Philips screwdriver and ratchet set (8mm and 10mm sockets recommended)
  • Pliers (for hose clamps, if equipped)
  • A catch pan for old coolant
  • Clean rags or towels
  • Funnel
  • Protective gloves and eyewear

Changing the Coolant: Step-by-Step for Your 2017 CRF125FB

  1. Allow the Engine to Cool
    Never open the radiator cap on a hot bike. Let the engine cool completely before proceeding–this prevents serious burns and avoids spilling pressurized fluid.
  2. Remove the Right Side Plastic Shrouds
    Take off the side panel and shrouds on the radiator side. Usually, this involves removing several bolts and plastic fasteners. Set these aside in a safe location for reinstallation later.
  3. Drain the Old Coolant
    Position a catch pan beneath the water pump or radiator drain bolt (typically located at the lowest point of the coolant circuit). Use the appropriate socket to remove the drain bolt. Open the radiator cap to allow the system to drain faster.
    Tip: Some models use a small crush washer on the drain bolt; inspect the washer for damage and replace if necessary.
  4. Flush (Optional but Recommended)
    For thorough maintenance, flush the cooling system with distilled water to remove old residue. Reinstall the drain bolt, refill with distilled water, run the engine briefly (just a couple of minutes), then let it cool and drain again.
  5. Refit Drain Bolt
    Install the drain bolt (use a fresh crush washer if applicable), and tighten to the manufacturer’s specified torque.
  6. Refill with Fresh Coolant
    Insert a funnel into the radiator neck and pour in the recommended amount and type of silicate-free coolant. Fill to the base of the filler neck. If your bike has a separate expansion/overflow tank, fill to the appropriate level indicated on the tank.
  7. Bleed Air from the System
    With the radiator cap off, start the engine and let it idle. Lightly rock the bike side to side to help trapped air escape. As the coolant circulates, you may notice the level drop; top off as needed. Once air bubbles stop escaping and the coolant maintains level, shut off the engine and allow it to cool slightly before reinstalling the cap.
    Note: On some models, repeated heat cycles and topping off may be necessary if air persists in the system–check levels again after your next ride and top off if needed.
  8. Reassemble the Plastics
    Replace the removed panels and fasteners, ensuring all tabs and grommets are properly aligned.
  9. Final Check
    Start the engine and let it reach normal operating temperature. Check for leaks around the drain bolt and hoses. After the engine cools down, verify coolant level and top off if needed.

Special Notes for the 2017 Honda CRF125FB Owner

  • Coolant Capacity: The CRF125FB has a small-capacity cooling system, so be precise and avoid overfilling. Overfilling can cause excess pressure and coolant loss from the overflow tube during operation.
  • Recommended Coolant: Always use silicate-free, motorcycle-specific coolant to prevent corrosion and damage to aluminum components. Avoid using automotive coolant with silicates – it can compromise gaskets and engine surfaces.
  • Inspection: Check hoses and radiator cap for wear or cracking. Replace as needed.
  • Interval: Honda recommends changing coolant at least every two years or as indicated in your owner’s manual, especially if you ride in harsh or muddy conditions. Fresh coolant maintains optimal engine temperature and helps prevent overheating.

Why Regular Coolant Changes Matter

Routine coolant service on your CRF125FB helps avoid overheating, protects internal engine components, and ensures maximum performance. Riding with old or contaminated coolant risks corrosion, mineral buildup, and can eventually cause significant engine damage.

Keep your 2017 Honda CRF125FB running cool and strong–refresh that coolant for peace of mind, wherever your MotoSport adventures lead.

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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.