How to Change the Coolant in a 2014 Yamaha YZ85: Complete Guide
Shop parts for a 2014 Yamaha YZ85 Dirt Bike.
Maintaining optimal engine temperature is essential for the performance & longevity of your 2014 Yamaha YZ85. Changing the coolant is a straightforward process, but a few model-specific tips will ensure you do it safely and correctly. Here is MotoSport's proprietary step-by-step guide tailored to your YZ85.
Why Change Coolant Regularly?
- Prevents engine overheating & costly damage
- Flushes contaminates & corrosion from the cooling system
- Keeps performance consistent, especially during aggressive rides
What You'll Need
- Fresh coolant compatible with aluminum engines (consult your owner's manual or MotoSport for recommendations)
- Basic hand tools (socket set, screwdriver)
- Rags & a drain pan
- New drain bolt gasket (recommended for best seal)
- Clean tap water (for flushing system)
- Safety gear (gloves, eye protection)
Step-by-Step: Changing the Coolant
- Let the bike cool. Ensure your YZ85 is cool to the touch before starting this process.
- Remove the seat and side panels. This gives full access to the radiator cap & hoses.
- Remove the radiator cap. Twist the cap slowly to release any residual pressure.
- Place the drain pan below the water pump drain bolt.
- Remove the drain bolt on the water pump cover. Allow coolant to fully drain. For the YZ85, this bolt is on the side of the right crankcase cover. Remove the lower radiator hose if quicker draining is needed.
- Flush the cooling system. Reinstall the drain bolt (use a new gasket if possible). Fill the radiator with clean tap water, reinstall the radiator cap, start the engine, and let it idle for a few minutes. Shut off, cool, remove the cap, and drain. Repeat until clear water drains out.
- Install the drain bolt and torque to spec. (If unsure, use snug but not excessive force; over-tightening can damage soft aluminum threads.)
- Fill with fresh coolant. Pour in pre-mixed coolant up to the bottom of the radiator filler neck. Gently tip and shake the bike to release air pockets.
- Start the engine with the radiator cap off. Let it idle for 2-3 minutes to purge trapped air. Top off coolant if needed. Watch for bubbles and check for leaks at hoses & drain bolts.
- Replace the radiator cap, then reinstall the seat & panels.
- Dispose of old coolant properly. (Never pour into drains or onto the ground.)
2014 YZ85 Coolant Tips & Notes
- The YZ85's cooling system is compact, so air pockets can persist. Always firmly burp the system as described above.
- Inspect hoses & the radiator for cracks, swelling, leaks, or mineral buildup while you have the system open.
- This model benefits from routine cooling system flushes every season for peak performance.
- Always use a coolant formulated for aluminum engines to prevent corrosion.
- Check the coolant level frequently in hot conditions or after hard riding.
- If your YZ85 tends to run hot or be ridden in the sand, consider upgrading to high-efficiency radiators & hoses – available from MotoSport.
Final Checks
- After your first post-service ride, check coolant again when the engine is cold and top off if necessary.
- Look for leaks or residue as a sign of hose or seal issues.
Stay safe and keep your Yamaha YZ85 running at its best – routine coolant changes are one of the simplest ways to protect your performance investment.
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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.