How to Change the Coolant in a 2012 Yamaha WR250R (DUAL SPORT)

Shop parts for a 2012 Yamaha WR250R Dirt Bike.

Routine coolant replacement is vital for keeping your 2012 Yamaha WR250R running cool, especially if you tackle demanding trails and dual sport rides. Swapping out old coolant ensures optimal engine temperature, corrosion protection, and peak performance across all environments. Here is a step-by-step proprietary MotoSport guide for changing the coolant in your WR250R, including several specific model notes you should keep in mind.

Essential Tools & Supplies

  • Fresh Yamaha-approved or equivalent engine coolant formulated for aluminum engines
  • Distilled water (for flushing, if desired)
  • 8mm socket or wrench
  • Phillips head screwdriver
  • Torque wrench
  • Funnel
  • Drain pan
  • Shop towels and gloves

Step 1: Prep Your Bike Safely

  • Start with a cool engine. Never open the radiator cap when the engine is hot—hot coolant can cause severe burns.
    Place the bike on a stable stand in a well-ventilated, level area.
  • Remove the seat and both left and right side air scoops to access the radiator and reservoir tank.

Step 2: Drain the Coolant

  • Locate the radiator cap—remove the small lock screw securing it.
    Carefully place a thick rag over the cap and turn counterclockwise until you feel the detent, allowing any pressure to vent. Finish removing the cap.
    Specific WR250R Note: This model uses a pressurized radiator, so extra caution is mandatory. The radiator cap and coolant reservoir are tucked under the plastics.
  • Place your drain pan under the water pump. Locate the coolant drain bolt on the water pump body (left engine side). Loosen and remove the bolt and its copper washer.
    Allow all coolant to drainit will come from both the engine and the radiator.
  • If a thorough flush is desired, re-install the drain bolt with its washer, fill the system with distilled water, run the engine briefly, and re-drain.

Step 3: Flush the Reservoir Tank

  • Disconnect and remove the reservoir hose at the recovery tank. Remove the reservoir tank (a tight area on the WR250R), empty it, and rinse with distilled water if needed.

Step 4: Reinstall Drain Bolt and Fill with New Coolant

  • Install a new copper washer and the coolant drain bolt. Torque to 10 Nm (7.2 ft-lb) for a leak-free seal.
  • Slowly fill the radiator with coolant up to the filler neck. Squeeze any accessible coolant hoses to release trapped air.
    Fill the reservoir tank to the upper mark, reattach its hose, and reinstall the air scoops and seat.
    Note: The WR250R uses a relatively small coolant capacity. Avoid overfilling both the radiator and reservoir, as excess can cause overflow or pressure issues.

Step 5: Bleed Air and Inspect

  • With the radiator cap off, start the engine and let it idle until the thermostat opens (warm engine, not hot).
    Top off coolant if the level drops due to air escaping.
    Replace and secure the radiator cap and lock screw.
  • Inspect all bolts, clamps, and hoses for leaks. Wipe up any spills. Confirm the reservoir is correctly filled.

Final WR250R Owner Notes

  • This model's engine is liquid cooled with a small radiator; monitoring coolant quality is critical during off-road or dual sport use where airflow varies.
  • Always use aluminum-safe coolant and avoid automotive green formulas that can corrode your radiators.
  • Check your coolant level after your first post-change ride—trapped air may still vent out.
  • The reservoir tank location is challenging to access; patience and the right tools are helpful.
  • Follow the WR250R's service manual intervals or replace the coolant every two years, whichever comes first.

Performing regular coolant changes helps prevent engine overheating, pump damage, and keeps your 2012 WR250R exploring the trails or streets with confidence and peace of mind.

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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.