How to Change the Coolant in a 2011 Husqvarna WR300: MotoSport Guide
Shop parts for a 2011 Husqvarna WR300 Dirt Bike.
Your 2011 Husqvarna WR300 is designed for high-performance off-road riding, and regular maintenance–like a coolant change–is crucial to keep it running at its best. Coolant not only regulates engine temperature, it also protects internal components from corrosion and premature wear. Below is a detailed, proprietary step-by-step guide from MotoSport for changing the coolant on your WR300, along with important model-specific notes.
Tools & Supplies Needed
- Phillips or flat head screwdriver (to remove radiator shrouds, if needed)
- 8mm or 10mm wrench or socket set
- Drain pan
- New coolant (50/50 premixed ethylene glycol motorcycle-specific coolant recommended)
- Clean rags
- Funnel
- Nitrite-free coolant is generally preferred for modern two-strokes like your WR300
Step-by-Step Coolant Change Instructions
- Ensure Safety & Access:
- Start with the engine cold–never open the cooling system when hot due to pressure and potential burns.
- Place the bike securely on a stand, and remove the radiator shrouds if they block access to the radiator cap or drain bolt.
- Drain Old Coolant:
- Locate the radiator drain bolt (commonly on the lower side of the right radiator, or at the water pump cover for this MMY). Position your drain pan under the bolt.
- Loosen the radiator cap first (this relieves pressure and lets coolant drain smoothly), then remove the drain bolt. Allow all coolant to empty completely.
- Flush (Optional but Recommended):
- If the old coolant is discolored or contaminated, flush the system with distilled water. Replace the drain bolt, fill with water, run the engine brie.y (1-2 mins), let cool, and drain again.
- Refit Drain Bolt:
- Clean and reinstall the drain bolt. Torque to firm tightness–do not overtighten to avoid stripping threads.
- Refill with New Coolant:
- Using a funnel, pour coolant slowly into the radiator filler neck. Fill until the coolant reaches just below the filler lip.
- To burp air out, gently tip the bike left and right–about 45 degrees each way–a few times as you add coolant. This helps trapped air escape from the head and water jacket.
- Burp the System:
- Squeeze radiator hoses by hand or gently rock the bike to help bubbles rise.
- Add a little more coolant if the level drops, continuing until bubbling stops and the level stays constant.
- Reinstall Radiator Cap:
- Secure the radiator cap back on. Clean up any spilled coolant.
- Run and Inspect:
- Start the engine and let it idle until it reaches operating temperature. Watch for leaks at radiator, hoses, and drain bolt.
- Shut off engine, let cool completely, and recheck level when safe. Top off if needed.
- Reinstall Shrouds and Finish Up:
- Replace any removed shrouds and dispose of old coolant responsibly following local regulations.
Model-Specific Notes for the 2011 WR300
- Radiator Design: The WR300's radiators are robust, but the system can trap air pockets–be patient and thorough during the burping process for optimal cooling performance.
- Engine Type: This is a two-stroke, so there is no coolant circuit through a cylinder head valve area (unlike four-strokes)–flushing with water is safe, but always use proper coolant for final fill.
- Expansion and Reservoir: If your WR300 is equipped with a coolant overflow reservoir, monitor and top it up to proper level after your first ride following the change. Small drops in level are normal as bubbles work their way out.
- Coolant Amount: Always follow owner's manual or MotoSport's coolant capacity guidance for your WR300 to avoid over- or under-filling the system.
- Performance Tip: Use only high-quality coolant for optimal heat transfer. If riding in extreme cold, ensure freeze protection is sufficient. Never use straight water for extended periods.
Troubleshooting & Aftercare
- If you notice repeated coolant loss, check for leaks at hoses/clamps or inspect the water pump seal.
- Avoid running the engine without coolant, even briefly.
- Review your WR300's manual for torque specs if unsure. Consult MotoSport experts or your service manual if you encounter stubborn air locks or overheating after service.
Follow this MotoSport guide and your 2011 Husqvarna WR300 will stay cool & ready for the toughest rides. Proper coolant maintenance isn't just about performance–it's about protecting your investment ride after ride.
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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.