How to Change the Coolant in a 2024 Yamaha YZ85 Big Wheel (YZ85LW)
Shop parts for a 2024 Yamaha YZ85LW Dirt Bike.
Regular coolant changes are essential for keeping your 2024 Yamaha YZ85LW Big Wheel running at peak performance and preventing overheating during long motos. Follow this detailed guide tailored for MotoSport riders and your specific MMY dirt bike to get the job done efficiently and safely.
What You Need
- Fresh motorcycle coolant (never use plain water or tap water)
- Drain pan
- Socket wrench and appropriate sockets
- Funnel
- Rags for clean-up
- Protective gloves
Step-by-Step Coolant Change Process
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Prep Your Bike
Ensure your YZ85LW is cold to the touch. This is crucial—opening the radiator cap when the engine is hot can cause severe burns. Stand the bike upright on a level surface to get an accurate coolant level. -
Remove the Radiator Cap
Slowly twist off the radiator cap located at the top of the radiator. If you feel any pressure release, wait a moment before removing it completely. -
Drain Old Coolant
Locate the coolant drain bolt at the bottom of the right side of the engine (crankcase area) and place a drain pan underneath. Remove the bolt and allow the old coolant to fully drain. Tip the bike gently from side to side to ensure complete drainage. -
Flush the System (Optional but Recommended)
To remove residue and contaminants, flush the system with distilled water. Add water to the radiator, reinstall the drain bolt temporarily, and run the engine for a minute (do not let it overheat). Stop, drain, and repeat until only clear water comes out. -
Reinstall the Drain Bolt
Ensure the sealing washer is in good condition and reinstall the bolt. Tighten it to specification–snug, but do not overtighten to avoid stripping the threads. -
Add New Coolant
Using a funnel, slowly pour new motorcycle coolant into the radiator opening. Fill to the bottom of the filler neck–do not overfill, as the level will rise with heat. Pause occasionally to allow air pockets to escape; gently squeeze radiator hoses to help burp air out. -
Check Level and Reassemble
With your YZ85LW upright, ensure the coolant is at the correct level (bottom of filler neck). Reinstall the radiator cap, making sure it is secure. Wipe away any spills and inspect for leaks around the drain bolt and hoses. -
Start the Engine & Re-Check
Start your bike and let it idle for a few minutes. Watch the temperature and check for leaks. After cooling down, recheck the coolant level and add more if necessary.
YZ85LW-Specific Notes
- The 2024 YZ85 Big Wheel features a high-performance radiator designed specifically for aggressive youth riders, so keeping the coolant clean and full is critical for race-day reliability.
- Always use coolant formulated for aluminum engines to prevent corrosion and gasket failure.
- Check the coolant before every ride. A small decrease can indicate leaks or head gasket issues, which are more common under heavy use.
- Make sure to position the bike perfectly upright when checking or filling the coolant. Even a slight tilt can cause an incorrect level reading.
Performing routine coolant changes protects your powerful 2024 Yamaha YZ85LW engine. For the best maintenance outcomes, inspect all hoses and clamps while doing this service and always use high-quality replacement parts and fluids.
Related Shopping Categories
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Shop Tools for a 2024 Yamaha YZ85LW Dirt Bike.
Shop Radiator Hoses for a 2024 Yamaha YZ85LW 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.