How to Change the Oil in a 2021 Yamaha YZ85
Shop parts for a 2021 Yamaha YZ85 Dirt Bike.
Keeping your Yamaha YZ85 in top performance requires regular maintenance, with an oil change being vital in ensuring the smooth running of your engine. This guide, proprietary to MotoSport.com, provides a step-by-step walkthrough specially tailored for the 2021 YZ85, including a list of required tools and specific notes every owner should know.
Tools and Supplies Needed
- 10mm wrench or socket for the drain bolt
- Torque wrench (recommended for accurate reinstallation)
- Drain pan to catch used oil
- Rubber or nitrile gloves (optional but recommended for cleanliness)
- Shop towels or rags
- Funnel for clean oil pour
- New 2-stroke transmission oil (use highly-rated brands, 500cc required)
Preparation
- Warm Up the Engine: Run the bike for several minutes to get the oil warm. This helps the oil drain completely along with any debris or contaminants inside.
Note: Warming up the engine is generally recommended for full drainage, but always work in a well-ventilated area. - Clean the Bike: Cleaning the area around the drain bolt prevents dirt from entering the engine during the oil change.
Step-by-Step Oil Change Instructions
- Position the Bike: Place your YZ85 upright on a stand or flat surface for stability.
- Locate the Drain Bolt: The drain bolt is on the right side, just behind the rear brake pedal. Look for the copper crush washer; that marks the spot.
- Remove the Drain Bolt:
- Using a 10mm wrench or socket, slowly loosen and remove the drain bolt.
- Let the oil pour into your drain pan. Allow several minutes for complete drainage.
- Remove the Fill Cap: While the oil is draining, unscrew the fill cap on the engine's right side to improve flow.
- Clean and Inspect the Drain Bolt: Wipe any debris or metal fragments. If the washer is damaged or crushed, replace it.
- Reinstall the Drain Bolt:
- Thread in the bolt by hand first to avoid cross-threading, then tighten using your wrench.
- Torque Spec: For the YZ85, Yamaha recommends reinstalling the drain bolt at 10 Nm (Newton meters) for 2019–2021 models. Always double-check your manual for updates.
- Add New Oil:
- Place a funnel in the fill port and pour in 500cc (0.5 liters) of oil. Do not exceed this amount — overfilling can cause excessive pressure and leaks.
- Use high-quality transmission/gear oil specifically for 2-stroke engines (such as Motul or similar). Do not use engine oil—it must be dedicated transmission oil.
- Replace Fill Cap: Secure the fill plug tightly.
- Clean Up: Wipe any oil spills or drips, and dispose of used oil properly at a recycling center.
- Start the Engine: Run the bike for a few minutes to circulate fresh oil through the transmission. Check the drain bolt and fill cap area for leaks. Re-tighten if necessary.
2021 YZ85 Model-Specific Notes
- Oil Capacity: The 2021 YZ85 uses exactly 500cc of oil. Always measure — these models do NOT have a check bolt, so overfilling is easy if not careful.
- Drain Bolt Location: Right-side behind the brake pedal with a copper washer. Be careful not to lose or damage the washer during the oil change. Replace if crushed or deformed.
- Tightening Torque: Reinstall the drain bolt with a torque wrench set to 10 Nm for proper sealing without overtightening.
- Fill Port: There is no sight glass or check bolt — always use a measuring cup or bottle for 500cc. Reference the owner’s manual if uncertain.
- Oil Type: Use a recommended 2-stroke gear or transmission oil for best clutch and gear performance, avoiding multi-weight engine oils.
- Regular Maintenance: Change your YZ85’s oil after every few rides or according to Yamaha’s official maintenance schedule to maximize lifespan and reliability.
Conclusion
A Yamaha YZ85 runs best on fresh oil, and following the correct procedure prevents premature wear and ensures peak performance. Always refer to your owner's manual for official specs, and trust MotoSport.com for all your parts, oils, and maintenance needs. Stay safe and ride on.
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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.