How to Change the Oil in a 2010 Yamaha YZ85: Step-by-Step Guide
Shop parts for a 2010 Yamaha YZ85 Dirt Bike.
Keeping the oil fresh on your 2010 Yamaha YZ85 is a critical part of regular maintenance that ensures your bike performs at its best and remains reliable. In this in-depth guide, proprietary to MotoSport.com, we’ll cover all the tools you’ll need, detailed steps, and model-specific notes for a smooth and effective oil change. Experienced or just starting out, you’ll finish with confidence and a cleaner-running dirt bike.
Tools and Supplies Needed
- 10mm socket or spanner (for the oil drain bolt)
- Oil drain pan (to catch old oil)
- Funnel (for refilling oil)
- Rags or paper towels
- Disposable gloves (recommended for cleanliness)
- Fresh transmission oil (500 mL/cc’s) – consult your owner’s manual for recommended type
- Parts cleaner or degreaser (to clean the drain bolt)
Preparation
- Clean your bike first. Dirt near the filler or drain bolts can get inside your engine – always work from a clean surface for best results and longer engine life. A quick rinse and dry is all you need before starting.
- Warm up the engine. Allow the engine to run for a couple of minutes. This helps suspend contaminants and allows the oil to drain efficiently.
- Secure the bike on a stand. A center stand or triangle stand ensures the bike remains upright, stable, and safe during maintenance.
Step-by-Step Instructions
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Locate the Drain Bolt
- The drain bolt on the 2010 YZ85 is located underneath the engine case, typically right next to your brake lever.
- Prepare your oil pan below the bolt before loosening it so you don’t spill oil onto the ground.
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Remove the Oil Drain Bolt
- Use the 10mm socket or spanner to loosen the bolt. Remove it by hand toward the end to prevent dropping it into the oil pan.
- Allow the oil to flow freely. Tilting the bike slightly towards the drain side (but not so far that it tips over) helps remove the last bit of old oil.
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Inspect and Clean the Drain Bolt
- Check the drain bolt for metal shavings or debris – a small amount is normal, but chunks or an excessive amount may indicate a problem.
- Clean the bolt thoroughly with a rag or parts cleaner.
- If your drain bolt uses a crush washer, inspect it and replace if it’s damaged.
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Reinstall the Drain Bolt
- Once oil has fully drained and the bolt is clean, reinstall the drain bolt and hand-tighten, then finish tightening with the 10mm wrench or socket. Do not overtighten; snug is sufficient.
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Remove the Oil Fill Cap
- The fill cap on the YZ85 is located on the engine’s right side. Remove it to allow access for refilling and ensure air flow as you pour.
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Add Fresh Oil
- Using a small funnel, pour exactly 500 mL of the manufacturer-recommended transmission oil into the fill port. Do not overfill – the 2010 YZ85 is quite sensitive to oil levels.
- Double-check your owner’s manual for oil specifications and capacity in case of any previous modifications.
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Secure the Fill Cap
- Wipe around the fill opening to ensure it’s clean. Reinstall the fill cap securely.
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Check for Leaks
- Start the bike and let it idle for a minute to circulate the fresh oil. Inspect the drain bolt and fill area for leaks. If you spot any, turn off the bike and tighten the bolts gently as needed.
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Dispose of Old Oil
- Pour the old oil from your drain pan into a sealed container and bring it to your local recycling center or auto parts shop for proper disposal. Never pour it onto the ground or into the trash.
Model-Specific Tips: 2010 Yamaha YZ85
- Oil capacity is 500 mL (500 cc’s) – using too much or too little will affect performance and longevity.
- Only use transmission oil specifically for 2-stroke gearboxes. Automotive oils do not provide the correct protection or clutch performance.
- Always change oil after muddy or wet riding. Water contamination is a risk, especially after creek crossings or rain races.
- Inspect oil for milky appearance – this can indicate water intrusion which may require additional investigation.
- On the YZ85, always ensure the drain bolt is tightened, but never overtighten. Stripping the small threads on the case is a common (& expensive) mistake.
- Best accessibility tips: If you’re new to the bike, kneel on the throttle side to spot both the fill and drain ports easily.
Final Advice
- Consistently changing the oil at recommended intervals (every 5-10 hours of use or more frequently for racing/riding in harsh conditions) is the cheapest insurance for your YZ85’s performance and reliability.
- Keep track of oil change dates and hour meter for easy maintenance planning.
- If you have any doubts, always refer to your owner’s manual or consult a Yamaha dealer.
MotoSport.com has all the OEM and high-performance oils, tools, and replacement parts you need for your 2010 Yamaha YZ85. Ride safe and happy wrenching.
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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.