How to Change the Coolant in a 2013 Honda CRF250R
Shop parts for a 2013 Honda CRF250R Dirt Bike.
Keeping your 2013 Honda CRF250R running cool in harsh riding environments means regular coolant changes as part of your maintenance schedule. Here is MotoSport’s proprietary step-by-step guide tailored specifically for your CRF250R, covering all you need to know for a safe and effective coolant swap–from tool selection to model-specific precautions.
Why and When to Change the Coolant?
The CRF250R is a high-performance motocross bike. Its cooling system endures more stress than most trail bikes due to frequent revving and heat from racing conditions. Change your coolant at least every two years or after intensive riding seasons to ensure optimum engine protection and performance. Failing to maintain fresh coolant can lead to overheating, corrosion of radiator passages, and even engine failure.
What You Need
- Silicate-free ethylene glycol engine coolant (pre-mixed 50/50 or mix with distilled water if using concentrate; never use tap water)
- 5mm Allen key
- 8mm and 10mm sockets with ratchet
- Phillips screwdriver
- New drain bolt washer (recommended, especially if original is deformed)
- Catch pan or drain tray
- Funnel
- Clean shop rags or paper towels
- Gloves and safety glasses
Step-by-Step Guide
- Let the bike cool completely. Never remove the radiator cap on a hot engine to avoid pressurized coolant spray and burns.
- Remove necessary plastics: The right radiator shroud and side panel will need removal for clear access to the radiator cap, reservoir, and water pump. Use your 5mm Allen and 8mm socket to carefully remove these fasteners.
- Position your drain pan: Slide it beneath the water pump–it’s on the lower right side of the engine.
- Remove the radiator cap: Loosen the set screw if present using a Phillips screwdriver, then open the cap slowly to release any remaining pressure.
- Drain the coolant: Use the 8mm socket to remove the water pump drain bolt at the bottom of the pump housing. Allow coolant to drain fully. Squeeze the lower radiator hose gently to help residual coolant exit.
- Install a new drain washer: Inspect the old washer—replace if damaged. Reinstall the drain bolt and torque it to 10 Nm (7 ft-lb).
- Flush (optional for thoroughness): If you suspect contamination or are switching coolant types, pour a small amount of distilled water into the radiator, replace the cap, rock the bike side to side, and repeat the draining process. Repeat until fluid runs clear, then refill.
- Add new coolant: Slowly pour coolant into the radiator neck using a funnel, filling up to the bottom of the fill neck. Do NOT overfill.
- Bleed air from the system: Start the bike with the radiator cap off, let it idle for 3-5 minutes, then kill the engine. Top off coolant as the level drops from trapped air escaping. Replace the cap once the level stabilizes and stays full.
- Check the reservoir: The CRF250R's overflow reservoir must be filled to the upper level mark. Use the 10mm socket to remove the mounting bolts, top up with coolant, and reattach.
- Reinstall plastics and hardware in reverse order. Double-check all fasteners for tightness.
- Final check: After the first ride, let the bike cool and check the coolant level in both the radiator and overflow reservoir. Top off if needed.
CRF250R Model Notes & Cautions
- The 2013 CRF250R uses a lightweight aluminum dual-radiator system, optimized for rapid heat transfer but susceptible to clogging and damage from old coolant. Always use silicate-free coolant to protect the system from corrosion and abrasion.
- Never run the engine without coolant. Doing so for even a brief period can cause significant engine and water pump damage.
- The 2013 model is known for a relatively low coolant capacity compared to larger-displacement bikes. Always measure what you drain and ensure you replace at least the same amount or as per the owner's manual.
- Monitor for leaks after your first session post-coolant change—a sign of a faulty drain bolt washer or improper reservoir cap fit.
- If you ride in extreme heat or cold, consider checking the freeze and boil point ratings on your coolant for added protection.
Maintaining your CRF250R's cooling system is one of the simplest & most rewarding maintenance tasks’ proper care will keep your performance strong, your engine protected, and your rides worry-free.
Related Shopping Categories
Shop Radiators for a 2013 Honda CRF250R Dirt Bike.
Shop Coolant for a 2013 Honda CRF250R Dirt Bike.
Shop Temperature Sensors for a 2013 Honda CRF250R Dirt Bike.
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Shop Radiator Hoses for a 2013 Honda CRF250R 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.