How to Change the Coolant in a 2022 Yamaha YZ85 Big Wheel
Shop parts for a 2022 Yamaha YZ85LW Dirt Bike.The 2022 Yamaha YZ85 Big Wheel (YZ85LW) features Yamaha's advanced Power Valve System, a liquid-cooled 85cc two-stroke engine, and a high-capacity cooling system tailored for the extra demands of the Big Wheel chassis–2. Keeping your coolant fresh is vital for engine longevity and optimal racing performance, especially in a bike designed for big-air and aggressive youth riding.
Tools & Supplies Needed
- New coolant (according to manufacturer recommendations: ethylene glycol-based, silicate-free)
- Drain pan
- Socket or wrench to remove drain bolt
- Clean funnel
- Gloves and eye protection
- Distilled water (for flushing, if desired)
- Torque wrench (optional, but recommended for reinstallation)
Step-by-Step Coolant Change Guide
- Let Your Bike Cool
Place the YZ85LW on a stable, level surface. Ensure the engine is completely cool to avoid burns. - Remove the Radiator Cap
Carefully loosen and remove the cap from the radiator to relieve system pressure. - Drain the Coolant
Place the drain pan beneath the engine. Locate the coolant drain bolt (usually near the water pump on the right side of the engine). Remove the drain bolt and allow the coolant to fully drain out–4. - Flush the System (Optional but Recommended)
Replace the drain bolt temporarily and fill the radiator with distilled water. Start the engine briefly, letting it circulate (do not let it get hot), then shut off and drain again. Repeat as needed until water runs clear. - Reinstall the Drain Bolt
Reinstall the drain bolt securely. Use a torque wrench if available – refer to your owner's manual for the specified setting. Be careful not to overtighten, as the aluminum threads can strip. - Refill with Fresh Coolant
Using a funnel, slowly pour new coolant into the radiator until the fluid reaches the bottom of the radiator filler neck. Bleed any air pockets by gently rocking the bike side to side. - Check for Leaks & Final Steps
With the cap still off, start the engine and let it idle for a minute to circulate coolant and purge air. Shut off, top up again if needed, and replace the radiator cap. - Straighten Up & Clean Up
Wipe away any spilled coolant, properly dispose of the old fluid according to local regulations, and ensure all parts are securely fastened.
Noteworthy Tips for YZ85LW Owners
- High-Capacity Radiator: The YZ85LW's radiator is larger than standard 85s and uses an aluminum impeller for improved cooling, so system capacity may be higher than other bikes in this class–2.
- Chemistry Matters: Always use a silicate-free coolant specifically designed for high-performance motorcycles to prevent premature wear of the water pump and radiator elements.
- Inspect During the Job: Check hoses, clamps, and the radiator core for signs of wear or leaks while the system is open.
- Recommended Maintenance Intervals: Flush and replace coolant at least once a year or more often if you ride in harsh conditions. Consistency helps protect the magnesium engine cases and cooling components from corrosion.
Maintaining fresh coolant isn't just about engine temperature – it's about getting the most reliable performance out of your YZ85 Big Wheel for every moto. With regular upkeep, you keep your power, durability, and confidence at full throttle.
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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.