How to Change the Coolant in a 2017 Honda CRF250X

Shop parts for a 2017 Honda CRF250X Dirt Bike.

If you're riding a 2017 Honda CRF250X, routine maintenance is key to making the most of your bike's legendary reliability. One of the most important maintenance jobs is changing the coolant. Over time, coolant breaks down, loses efficacy, and can even become contaminated. Fresh coolant helps maintain proper engine temperature and prevents overheating, corrosion, and other engine-damaging issues – especially critical on a high-revving off-road machine like the CRF250X.

What You Need

  • Honda-recommended coolant (silicate-free/compatible with aluminum engines)
  • Drain pan
  • Socket set (for water pump drain bolt)
  • Funnel
  • Fresh water for flushing (distilled recommended)
  • White vinegar (optional, for thorough flush if switching coolant types)
  • Torque wrench (recommended)
  • Rags for cleanup

Changing the Coolant – Step by Step

  1. Let your engine cool completely before beginning. Never open the radiator cap on a hot engine – the system is under pressure, and hot coolant can cause serious burns.
  2. Remove the radiator cap carefully, twisting slowly to release any residual pressure.
  3. Disconnect the siphon hose at the reserve tank and drain the fluid into your drain pan. Flush the reserve tank with clean water, then reconnect the hose.
  4. Remove the coolant drain bolt from the water pump cover. Let the coolant flow into your pan. This empties the system. – For best results, gently rock the bike side-to-side to help everything drain.
  5. Flush the system by pouring clean water into the radiator fill neck. Allow it to drain from the water pump drain bolt opening until the water runs clear.
    • If you're switching coolant types (example: going to Engine Ice), first flush with a 50/50 mix of white vinegar and water, then follow up with another flush of clean water to remove any vinegar residue.
  6. Reinstall the drain bolt and torque it to Honda specifications – avoid over-tightening, which can damage threads.
  7. Refill the radiator with your chosen coolant using a funnel. Fill to the bottom of the radiator filler neck, but don’t reinstall the cap yet.
  8. Lean the bike gently side to side (about 20 degrees each way) to help trapped air escape. Continue to top off coolant as air bubbles out and the level drops. Repeat until the level stabilizes.
  9. Install the radiator cap securely. Fit tightly – a loose cap allows coolant loss and can cause overheating and engine damage.
  10. Fill the reservoir to the minimum mark. Do not replace the reservoir cap yet.
  11. Start the engine and let it idle for 2–3 minutes. Snap the throttle several times to help bleed air out of the system.
  12. With the bike idling, check the reservoir level. Top it off as needed to keep coolant between the minimum and maximum lines. Do not remove the radiator cap when the engine is hot.
  13. Shut off the engine, double-check the coolant level, and fill the reservoir as needed. Replace the reservoir cap.
  14. Inspect for leaks at the water pump drain bolt and all hoses.

2017 CRF250X – Model-Specific Notes

  • The CRF250X is designed for off-road and GNCC-style riding. Its cooling system is robust, but regular coolant changes are essential to guard against debris, mud, and hard use that can accelerate coolant breakdown or contamination.
  • The coolant capacity is about 0.98 US quarts (0.93 liters) when just changing the fluid. If you’re fully disassembling the system, capacity rises to 1.06 US quarts (1.00 liter).
  • A small loss of coolant (0.7–2.0 US oz) through the overflow tube is normal. If you notice steady drops in coolant level, inspect hoses and connections for leaks, and inspect the radiator cap seal for wear.
  • When reinstalling plastics or covers, make sure nothing pinches or kinks the radiator hoses.

Final Tips

  • Use pre-mixed or properly combined coolant recommended for aluminum engines and avoid hard water.
  • Check coolant level regularly – especially after your next ride, as trapped air may purge from the system and require a small top-off.
  • Dispose of old coolant responsibly; it is toxic to animals and the environment.

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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.