How to Change the Oil in a 2009 Kawasaki KX85 — The MotoSport.com Guide
Shop parts for a 2009 Kawasaki KX85 Dirt Bike.
Regularly changing the transmission oil in your 2009 Kawasaki KX85 is essential for smooth shifting and long engine life. This two-stroke dirt bike relies on fresh oil to keep the transmission and clutch working efficiently. The KX85 uses 700 milliliters (ml) of oil—be sure not to overfill. This step-by-step tutorial, proprietary to MotoSport.com, explains every detail to keep your KX85 performing at its peak.
Tools & Supplies Needed
- 14mm socket and ratchet
- Drain pan (to catch used oil)
- Measuring cup or graduated oil container (minimum 700 ml capacity, for accurate measurement)
- Funnel
- Clean rag
- Fresh transmission oil (recommend 10W-40 for most riding conditions)
- Gloves (optional, for cleanliness)
Step-by-Step Instructions
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Warm Up the Engine
Start your bike and let it idle for a minute or two. This allows the oil to warm up so it drains more quickly and thoroughly. -
Prepare the Area
Place your KX85 on a stable stand and ensure it's upright. Position your drain pan under the drain plug at the bottom of the engine. -
Remove the Drain Plug
Use a 14mm socket to carefully loosen and remove the drain plug. Allow the old oil to drain completely into the pan. Take care—the oil can be hot.- Tip: Inspect the oil for metallic flakes. A small amount is normal, but excessive debris could signal worn transmission parts.
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Clean and Reinstall the Drain Plug
Wipe the drain plug clean, checking the condition of its washer. Replace the washer if it's damaged. Thread the plug back by hand, then snug it gently with your socket. Don’t overtighten—these aluminum threads strip easily. -
Measure and Add New Oil
Pour 700ml of fresh 10W-40 oil into your measuring jug. Insert a funnel into the oil fill hole (right side of the engine) and carefully pour in the oil. Replace and tighten the oil fill cap by hand. -
Check the Oil Level
Stand the bike upright and perpendicular (not leaning on a stand). Look at the small inspection hole or notch behind the clutch cover: the oil should just reach this mark.- If oil is low, add small amounts until correct. If overfilled, remove some oil with a clean syringe or by slightly loosening the drain plug.
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Clean Up
Wipe up any spilled oil, properly dispose of the used oil at a recycling center, and make sure all tools are accounted for. -
Final Tips
Start the engine and check for leaks around the drain and fill plugs. Allow the bike to idle briefly, then recheck the oil level for peace of mind.
KX85-Specific Call-outs
- Oil Capacity: 700ml—do not exceed to avoid clutch drag or leaks.
- Engine Type: The KX85 is a two-stroke; you are changing only the gear/transmission oil, not engine oil (the two-stroke engine gets its lubrication from premixed fuel).
- Drain Plug Location: There is only one drain plug on the underside—14mm head.
- Recommended Interval: Change after every 3-5 hours of riding, or more frequently for racing or harsh conditions.
- Thread Fragility: The KX85’s drain bolt is notorious for easy thread stripping. Always hand start the bolt and avoid excess force.
Common Questions Answered
- Can I use automatic transmission fluid (ATF)? 10W-40 is standard, but some riders use ATF for specific clutch performance. Stick with 10W-40 for general use.
- What oil brands are best? Look for motorcycle-specific oils such as Motul, Yamalube, Bel-Ray, or OEM Kawasaki products.
- How to tell if oil is bad? Oil should be clear to amber. If dark, gritty, or smells burnt, change it.
Final Note
Changing your KX85’s oil is quick, simple, and pays big dividends in reliability. For OEM filters, gaskets, oil, and tools, trust MotoSport.com’s extensive dirt bike maintenance catalog—your partner for every ride.
Related Shopping Categories
Shop Motor Oil for a 2009 Kawasaki KX85 Dirt Bike.
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Shop Oil Drain Pans for a 2009 Kawasaki KX85 Dirt Bike.
Shop Tools for a 2009 Kawasaki KX85 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2009 Kawasaki KX85 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.