How to Change the Oil in a 2014 Yamaha YZ85 — MotoSport.com Exclusive Guide
Shop parts for a 2014 Yamaha YZ85 Dirt Bike.
Routine oil changes are essential for keeping your 2014 Yamaha YZ85 running smoothly and extending the life of your two-stroke engine. This guide walks you step-by-step through the process, highlights the tools required, and calls out specific details every YZ85 owner should know.
Tools & Supplies Needed
- 10 mm socket or wrench (for the drain bolt)
- Ratchet (for use with socket)
- Oil drain pan
- Funnel
- Measuring cup (500 ml/0.53 quarts capacity)
- Shop rags
- Fresh transmission oil (500 ml, check your owner’s manual for recommended spec; high-quality two-stroke transmission oil is best)
- Disposable gloves (optional for cleanliness)
Model-Specific Call-Outs: 2014 Yamaha YZ85
- Oil Capacity: 500 ml (0.53 US quarts). Do not overfill – YZ85s require precise measurement since there is no oil level sight window.
- Oil Drain Bolt Size: 10 mm bolt located near the brake lever. Use caution not to overtighten the bolt when reinstalling.
- No Oil Filter: The Yamaha YZ85 does not have a replaceable oil filter; simply drain and refill with fresh oil.
- Best Practice: Warm the engine for a minute or two before draining to help evacuate old oil completely.
Step-by-Step Guide
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Start With a Clean Bike
- Prevent dirt or debris from falling into the transmission by thoroughly cleaning the underside and around the drain bolt before starting any maintenance.
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Warm Up the Engine
- Let the bike idle for a couple of minutes. Warm oil drains faster and removes more contaminants.
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Stabilize the Bike
- Place the bike upright on a stand. Keeping it level ensures a complete oil drain.
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Remove the Oil Drain Bolt
- Locate the 10 mm drain bolt beneath the engine, near the brake lever.
- Position your drain pan directly underneath.
- Use your 10 mm socket or wrench to loosen and remove the bolt. Be mindful of residual hot oil.
-
Remove Fill Cap to Vent
- Unscrew the oil fill cap on top of the engine to allow air in, which helps the oil drain completely.
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Allow Oil to Drain Fully
- Let the oil drain completely into the pan. Tilting the bike gently to either side may help expel any trapped oil, but be careful not to tip too far.
- If the oil looks milky or excessively dirty, it may indicate water contamination or overdue maintenance — consult your service manual for next steps.
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Inspect and Clean Drain Bolt
- Wipe the drain bolt clean. Check for any metal shavings, which might signal excessive gear wear.
- Replace the crush washer on the bolt if it appears damaged or worn.
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Reinstall the Drain Bolt
- Thread the drain bolt in by hand to avoid cross-threading, then snug it up gently with your wrench. It does not need to be extremely tight – just secure enough to prevent leaks.
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Measure and Add Fresh Oil
- Measure exactly 500 ml of new transmission oil with your measuring cup.
- Insert your funnel in the fill hole and slowly add the oil to prevent overflows.
- Let the oil settle for a moment.
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Replace Fill Cap and Check for Leaks
- Reinstall the fill cap securely.
- Wipe down any spilled oil and start the engine for a minute.
- Check around the drain bolt and fill cap for any leaks.
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Clean Up & Dispose of Old Oil Properly
- Take the used oil to a proper recycling or hazardous waste center. Do not pour it down the drain or onto the ground.
Extra Pro Tips for the YZ85 Owner
- Changing your oil after every 5–10 hours of use, or every race weekend, helps ensure peak performance and clutch life.
- If your oil comes out with a gray or milky color, inspect the crankcase seals as water may be entering the engine.
- Use name-brand, high-quality two-stroke transmission oil designed for off-road motorcycles — avoid multi-purpose automotive oils.
Performing regular oil changes on your 2014 Yamaha YZ85 is one of the simplest yet most important ways to keep enjoying every ride — brought to you by MotoSport.com, your destination for everything motocross.
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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.