How to Change the Coolant in a 2020 Yamaha YZ65
Shop parts for a 2020 Yamaha YZ65 Dirt Bike.
Keeping your 2020 Yamaha YZ65 running at peak performance means never overlooking your cooling system. This two-stroke mini motocross bike can be tough on its coolant, especially if it's ridden hard or raced regularly. Here are step-by-step instructions to help you change the coolant, plus key tips unique to the YZ65.
Before You Begin
- Work on a cold engine to prevent burns—coolant gets hot under pressure.
- Gather supplies: fresh engine coolant compatible with aluminum components, catch pan, funnel, clean cloths, 8mm wrench (for drain bolt).
- Ensure the dirt bike is upright and stable on a level surface.
Step-by-Step Guide
- Remove the radiator cap.
Remove seat and plastics as needed for access. Twist the radiator cap off slowly to release any pressure. - Drain the old coolant.
Locate the coolant drain bolt at the water pump (right side of the engine, near the brake pedal). Place a catch pan underneath, loosen and remove the bolt. Allow all coolant to drain fully. - Optional: Flush the system.
For best results (especially when switching coolant types), flush the system with distilled or deionized water. Pour it into the radiator and let it drain to remove residues. Never use tap water due to mineral buildup risk. - Reinstall the drain bolt.
Inspect the bolt and copper washer for wear; replace if needed. Tighten securely to manufacturer spec. - Refill with new coolant.
Slowly pour coolant into the radiator. Stop periodically and gently rock the bike to release air bubbles. Fill until coolant reaches the top of the radiator neck. - Reinstall the radiator cap.
Ensure it's secured tightly. - Check for leaks and bleed air.
Briefly start the engine with the bike upright. Let it run for a few minutes, then shut off and let it cool. Top off coolant if the level drops, as air will purge out of the system. - Dispose of old coolant safely.
Do not pour coolant on the ground or down drains. Use a recycling center or hazardous waste facility.
What Makes the YZ65 Stand Out?
- The YZ65 uses a lightweight, compact cooling system designed for high-revving youth racing. Due to its smaller fluid volume, fresh coolant is especially critical to prevent overheating.
- The water pump, radiator, and hoses are packed tight to minimize weight. Pay attention to tight fasteners and limited access during service.
- Never mix coolant types (e.g., silicate-based with organic-acid technology). This can damage seals and reduce cooling efficiency.
- Consider using a dirt bike-specific coolant with rust–inhibiting additives for better engine protection and temperature control.
Pro Tips
- Inspect radiator hoses for cracks or bulges, and check that clamps are snug.
- If you ride in muddy or sandy conditions, rinse the radiator fins with low-pressure water as debris build-up can cause the bike to run hot.
- Regularly check coolant level before each ride—small leaks can become expensive if not caught early.
Routine cooling system service on your YZ65 ensures top performance and long engine life—whether you're battling at the track or tearing up the backyard.
Related Shopping Categories
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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.