How to change the coolant in a 2018 Honda CRF250L ABS Dirt Bike

How to Change the Coolant in a 2018 Honda CRF250L ABS (MotoSport Exclusive Guide)

Shop parts for a 2018 Honda CRF250L ABS Dirt Bike.

Routine coolant changes on your 2018 Honda CRF250L ABS are key to keeping the engine operating at optimal temperature and preventing overheating or internal corrosion. Honda recommends replacing the coolant at least every 24,000 miles or every two years, whichever comes first. The process is straightforward, but attention to detail is essential, especially with the unique nuances of the ABS model and Honda's engineering choices for this generation.

Tools – What You'll Need

• 50/50 premixed, silicate-free coolant (motorcycle specific)
• Funnel
• 5mm Allen key
• 8mm and 10mm sockets
• Ratchet
• Phillips head screwdriver
• Pliers (for hose clamps, if needed)
• Replacement crush washer for the radiator drain bolt (single use only)
• Drain pan
• Paper towels or shop rags

Step-by-Step Coolant Change Guide

1. Let your bike cool completely. Never open the radiator on a hot engine; pressurized coolant can cause burns.
2. Remove necessary plastics:
   - Using the 5mm Allen key, remove the top screw on the left fairing (radiator side).
   - On the right side, remove four screws and two plastic retainers to access the radiator cap and reservoir.
   - If your bike has an aftermarket skid plate, you may need a 4mm Allen to remove associated bolts for access.
   Tip: Keep fasteners organized for reinstallation later.
3. Remove the coolant reservoir:
   - Use a 10mm socket to remove the reservoir mounting bolts.
   - Place the reservoir aside for easier access to the radiator.
4. Drain the old coolant:
   - Place a drain pan under the water pump (below the right side of the engine).
   - Remove the radiator cap using a Phillips screwdriver for the set screw and then gently twist off the cap.
   - Use an 8mm socket to undo the coolant drain bolt at the base of the water pump.
   - Replace the crush washer before reinstallationthis step is crucial for a leak-free seal.
5. Flush (optional, but recommended):
   - For thoroughness, pour a small amount of distilled water through the radiator filler neck to flush out lingering residues.
   - Drain again using the bolt, then reinstall the bolt with a new crush washer, tightening securely but not overtightening.
6. Refill with fresh coolant:
   - Using a funnel, slowly pour the new coolant into the radiator until full. Use only silicate-free coolant to avoid damage to internal engine surfaces.
   - Fill the reservoir to the "Full" mark as well.
7. Bleed air from the system:
   - Reinstall the radiator cap. Start the engine and let it idle for several minutes to warm up.
   - Rev the engine gently a few times; this helps air bubbles escape.
   - Shut off the engine, allow it to cool, then remove the radiator cap to top off coolant as necessary.
   - Repeat until coolant level remains steady.
   Important for ABS bikes: The ABS pump and extra plumbing can trap air; thoroughly check after first ride for air pockets or low coolant level.
8. Reinstall plastics & check for leaks:
   - Replace the reservoir, fairing panels, and skid plate as needed.
   - Wipe down any spilled fluids and inspect for leaks around the water pump and all hose connections.

2018 CRF250L ABS Owner Notes

• ABS Components: Take extra care with wiring and sensor routing while removing and reinstalling panels–the ABS system adds harnesses that should not be pinched.
• Radiator Protection: Dual sport bikes are more likely to take debris hits–inspect your radiator for bends, leaks, or mud buildup during coolant service.

What Makes This Model Unique?

• The 2018 CRF250L ABS features Honda's lightweight, dual sport ABS system, which adds a degree of complexity (additional brake line routing and ABS modulator) and makes careful handling of components essential when sliding side panels on or off.
• Access to the coolant reservoir is slightly more cumbersome, but patience during fairing removal pays off with long-term reliability.

Keep your CRF250L ABS running cool on every ride—coolant service is a MotoSport essential for every dual sport enthusiast.

Related Shopping Categories

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Shop Tools for a 2018 Honda CRF250L ABS Dirt Bike.

Shop Radiator Hoses for a 2018 Honda CRF250L ABS Dirt Bike.

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.