How to Change the Coolant in a 2019 Yamaha YZ85
Shop parts for a 2019 Yamaha YZ85 Dirt Bike.
Regular coolant changes are essential for keeping your 2019 Yamaha YZ85 running at its best, especially under the intense conditions dirt bikes frequently experience. This guide gives you a step-by-step, MotoSport-exclusive walkthrough so you can confidently maintain your YZ85's cooling system and avoid costly engine damage.
Preparation – What You'll Need
- High-quality ethylene glycol antifreeze with corrosion inhibitors suitable for aluminum engines
- Clean container for old coolant
- New drain bolt gasket (recommended)
- Metric socket/wrench set
- Funnel
- Shop rags
Coolant Capacity & Key Specs
- Total coolant: 0.55 L (0.58 US qt, 0.48 Imp.qt) including all routes
- Recommended mix: 1:1 ratio of antifreeze and distilled water
Step-by-Step Coolant Change Guide
- Let your YZ85 cool completely. Never open a hot radiator.
- Place the bike on a level surface using a stand for extra stability.
- Remove the radiator cap. Loosen and set aside to release any residual pressure.
- Locate the coolant drain bolt in the lower area of the water pump cover (right side of the engine).
- Place your drain pan beneath the drain location. Remove the drain bolt and let coolant flow until fully drained.
- If performing a complete flush, reinstall the drain bolt and fill the radiator with distilled water. Repeat the drain process.
- Inspect and replace the crush washer/gasket on the drain bolt if needed for a leak-proof seal. Tighten the drain bolt to the manufacturer-specified torque.
- Slowly add new coolant to the radiator until full.
- Replace the radiator cap but don't fully tighten yet. Start the engine and let it idle for a few minutes, allowing air bubbles to escape through the system.
- Stop the engine and let cool slightly. Remove the radiator cap and top up to the bottom of the filler neck if necessary.
- Reinstall the radiator cap. Check around the water pump and hoses for leaks with the engine running.
Noteworthy for 2019 YZ85 Owners
- The YZ85 has a relatively small coolant volume, so precise measurement is important to avoid over- or under-filling.
- Always use antifreeze formulated for aluminum engines to prevent internal corrosion.
- Inspect hoses and gaskets for wear at each coolant change and replace as needed for best performance.
Staying on top of coolant maintenance is key for protecting your YZ85 against overheating and premature engine wear. Shop genuine parts and premium coolants to ensure your next ride is always race-ready.
Related Shopping Categories
Shop Radiators for a 2019 Yamaha YZ85 Dirt Bike.
Shop Coolant for a 2019 Yamaha YZ85 Dirt Bike.
Shop Temperature Sensors for a 2019 Yamaha YZ85 Dirt Bike.
Shop Tools for a 2019 Yamaha YZ85 Dirt Bike.
Shop Radiator Hoses for a 2019 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.