How to Change the Coolant in a 2020 Yamaha YZ85
Shop parts for a 2020 Yamaha YZ85 Dirt Bike.
Changing the coolant in your 2020 Yamaha YZ85 is an essential maintenance task that keeps the bike running at optimal temperatures and helps protect internal engine components. The YZ85 uses an aluminum engine that benefits from a specific coolant type and mixture for best performance and longevity.
Recommended Coolant and Quantities
- Use a high-quality ethylene glycol antifreeze containing corrosion inhibitors formulated for aluminum engines.
- Mix ratio: 1:1 (50 percent coolant – 50 percent distilled water).
- System capacity: 0.55 L (0.58 US qt, 0.48 Imp. qt) for the entire radiator circuit.
Tools and Supplies Needed
- Socket wrench or spanner (for drain bolt)
- Fresh coolant (as specified above)
- Distilled water (if not pre-mixed)
- Drain pan
- New drain bolt gasket (recommended)
- Shop rags
- Protective gloves
Step-by-Step Guide to Changing Coolant
- Ensure the engine is completely cool before beginning to avoid potential burns.
- Place the motorcycle on level ground and secure it with a stand for safety.
- Remove the seat to access the area around the radiator filler neck if needed.
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Locate the coolant drain bolt on the lower side of the water pump cover.
Position a drain pan underneath. - Remove the radiator cap to allow air in and help the coolant flow out smoothly.
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Unscrew and remove the coolant drain bolt.
Allow all old coolant to drain thoroughly into the pan. - Optional: Flush the system with distilled water for a complete coolant change, especially if the previous coolant type is unknown or contaminated. Reinstall the drain bolt and drain this rinse water as well.
- Install a new gasket on the drain bolt and torque the bolt to manufacturer specification (check your service manual for proper values) to avoid leaks.
- Pour in new coolant mixture slowly through the radiator filler neck until full.
- Reinstall the radiator cap securely.
- Start the engine and let it idle for several minutes with the bike upright. This circulates the new coolant and helps purge air bubbles.
- Turn off the engine and let it cool again.
- Remove the radiator cap and check the coolant level. Add more coolant if needed until it reaches the bottom of the filler neck.
- Inspect for leaks around the drain bolt, hoses, and radiator.
Model-Specific Tips for the 2020 Yamaha YZ85
- Be sure to use corrosion-inhibited coolant safe for aluminum, as the YZ85 engine and components are susceptible to internal corrosion from standard automotive coolants.
- Check hose clamps and radiator hoses for cracks or damage when changing coolant – replace if necessary to prevent leaks under pressure.
- Air pockets can cause overheating. Double-check the fill and bleed process for a consistent coolant level.
- Dispose of old coolant responsibly. It is toxic – never pour it on the ground or down drains.
Common Owner FAQs
- How often should I change the coolant? Yamaha recommends periodic coolant changes as outlined in your owner's manual. For most users, this is at least every two years, but always check for signs of discoloration or debris and change sooner if needed.
- Can I use pre-mixed coolant? Yes, as long as it meets specifications for aluminum engines and is mixed 50–50 with distilled water.
- I lost coolant after a tipover. Do I need to flush? Unless the coolant appears contaminated, topping up may suffice, but a full change ensures best protection and performance, especially after a significant spill or contamination.
Changing your 2020 Yamaha YZ85's coolant is a straightforward task that helps protect your engine and ensures consistent performance, whether you're on the motocross track or trail. Routine attention to the cooling system prevents overheating and extends the life of your dirt bike for more reliable riding.
Related Shopping Categories
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Shop Radiator Hoses for a 2020 Yamaha YZ85 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.