How to Change the Oil in a 2017 Yamaha YZ85: MotoSport.com Expert Guide
Shop parts for a 2017 Yamaha YZ85 Dirt Bike.
Changing the transmission oil in your 2017 Yamaha YZ85 is a key part of regular maintenance for your dirt bike. Keeping the oil fresh ensures smooth shifting, prolongs the life of your clutch and gears, and keeps your YZ85 running at its best, whether on the trail or the track. Here's a robust, expert-level guide with all the steps, tools, and tips specifically tailored for your bike.
Tools and Supplies Needed
- 10 mm wrench or socket (to remove and tighten drain bolt)
- Gloves (recommended for cleanliness and protection)
- Measuring cup (marked for at least 500 ml/cc)
- Funnel (for clean pouring)
- Clean rags or shop towels
- New oil (Recommended: high-quality 2-stroke transmission oil, 500 ml for YZ85)
- Oil drain pan
- Torque wrench (set to 10 Nm for drain bolt torque)
- Spray cleaner and brush (optional but highly recommended to clean the area before opening the engine)
Preparation and Safety
- Run the engine for a few minutes to warm up the oil – this helps it drain out fully and brings impurities with it. Warm oil flows more easily and ensures a cleaner, thorough oil change.
- Shut off the engine and place the bike on a stand or flat surface.
- Clean the area around the drain bolt and oil fill cap to prevent any dirt from entering the engine when the bolts are removed.
Step-by-Step Process
- Locate the drain bolt: On the YZ85, the oil drain bolt is found near the brake pedal side of the engine casing. It's a 10 mm bolt. Make sure your oil pan is underneath before proceeding .
- Remove the drain bolt: Use the 10 mm wrench or socket to loosen and fully remove the bolt. Allow all the oil to drain into your pan. If the oil appears milky or unusually dirty, this may indicate water intrusion or overdue changes.
- Tip the bike gently (if needed): Once the main flow finishes, you can tip the bike slightly to the side (away from the stand) to ensure all old oil is removed .
- Clean the drain bolt: Wipe off any metal particles or dirt from the bolt, and inspect the crush washer for wear. Replace the washer if necessary to ensure a leak-free seal .
- Reinstall the drain bolt: Hand-tighten the bolt first, then use your wrench or torque wrench to snug it down. The correct torque for the YZ85 drain bolt is 10 Nm (Newton meters). Do not overtighten, as this could strip the threads or crack the case .
- Remove the oil fill cap: This is typically near the top of the right engine case. Wipe away any dirt before opening .
- Add new oil: Use a funnel and a measuring cup to pour in exactly 500 ml (or cc) of high-quality 2-stroke transmission/gear oil. Pour slowly to avoid overflow . MotoSport.com recommends checking your Yamaha owner's manual for the best oil for your climate and riding style.
- Replace the oil fill cap: Tighten it securely by hand.
- Run the engine briefly: Start the bike and let it idle for a minute or two. Shut off the engine and let oil settle for a few minutes.
- Check for leaks: Inspect the drain bolt and fill area for signs of oil leaks. If you see any, check the drain bolt torque or washer condition.
YZ85-Specific Notes and Tips
- The 2017 Yamaha YZ85 (and similar year models) requires exactly 500 ml of transmission oil. Overfilling or underfilling can affect clutch performance and shifting .
- Always use high-quality, motorcycle-specific 2-stroke transmission oil for optimal clutch and gear protection .
- Make sure to warm up the engine gently before draining, as cold oil traps more sediment and is harder to drain completely .
- Torque specs matter: Overtightening the small drain bolt is a common mistake and can cause expensive damage .
- If your drain bolt's washer is damaged, replace it with a new one to prevent leaks (Yamaha part numbers for washers are widely available).
- On the YZ85, always check the manual for updates or service bulletins, as some models may have unique notes or changes year-to-year.
Disposal
- Dispose of used oil at an approved recycling center or hazardous waste facility. Never pour used oil down the drain or onto the ground.
MotoSport.com Pro Tips
- Keep a regular service log with date, operating hours, and oil type used.
- Check MotoSport.com for Yamaha OEM parts (bolts, washers, oil, and filters), and gear specifically for your model and year.
- Contact your local MotoSport.com service expert or check your Yamaha owner's manual if you have any doubts about the oil type or change procedure.
Regular maintenance, like timely oil changes, will keep your Yamaha YZ85 running stronger, longer, and safer—on any terrain.
Related Shopping Categories
Shop Motor Oil for a 2017 Yamaha YZ85 Dirt Bike.
Shop Oil Filters for a 2017 Yamaha YZ85 Dirt Bike.
Shop Oil Drain Pans for a 2017 Yamaha YZ85 Dirt Bike.
Shop Tools for a 2017 Yamaha YZ85 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2017 Yamaha YZ85 Dirt Bike.
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.