How to Change the Oil in a 2010 Kawasaki KX100 – MotoSport.com Guide
Shop parts for a 2010 Kawasaki KX100 Dirt Bike.
Maintaining your 2010 Kawasaki KX100 is crucial for performance and reliability. Regular oil changes ensure internal components stay lubricated and clean, keeping you on the track and out of the shop. Follow this comprehensive guide from MotoSport.com to safely and efficiently change the oil in your KX100.
Tools and Supplies Needed
- 14mm socket and ratchet (for drain plug)
- Measuring cup (to measure oil; minimum 700mL)
- New engine oil (recommended: 10W-40 or 5W-40 two-stroke transmission oil, consult your owner's manual)
- Drain pan (for collecting used oil)
- Funnel
- Gloves and shop rags
- Replacement crush washer for drain bolt (optional but recommended)
Preparation Steps
- Warm up your KX100 for about 1-2 minutes by idling. This helps thin the oil, allowing for a more complete drain.
"IDLE THE BIKE FOR A MINUTE TO MAKE THE OIL DRAIN FASTER" - Turn the engine off, place the bike on a stable stand, and ensure it's secure and upright for easy access to the drain plug and filler cap.
Step-by-Step: Changing the Oil
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Remove the Filler Cap
Unscrew the oil filler cap to allow air in, so the oil drains freely when you remove the drain plug. -
Locate and Remove the Drain Plug
Find the oil drain bolt beneath the engine (typically on the left side). For the 2010 KX100, use a 14mm socket.
"It's pretty simple, there's only one drain plug .... it's a 15 14 millimeter ... get your socket, break it loose..."- Place your drain pan under the plug.
- Carefully unscrew the bolt; be mindful not to lose the washer.
- Allow all the oil to fully drain — this may take up to 5 minutes for a thorough drain.
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Inspect and Replace the Drain Washer (if needed)
Check the copper or aluminum crush washer on the drain bolt. If it's damaged, warped, or missing, replace it to prevent leaks. -
Reinstall the Drain Plug
After the oil has completely drained, reinstall the drain plug and washer.
Do not overtighten — snug it securely but avoid stripping the threads.
"be careful not to snug this green bolt down too tight or you'll strip the threads" -
Refill with Fresh Oil
Use a measuring cup to pour exactly 700 milliliters of fresh oil for the KX100.
"the kx 100 both take 700 milliliters of oil ... we'll fill it up to 700 milliliters"- Insert a funnel into the oil fill hole. Pour in the new oil slowly to prevent spillage.
- Replace and tighten the fill cap.
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Verify the Oil Level
Place the bike upright and perpendicular to the ground (not on the stand), and check the oil level at the inspection notch on the right side of the case.
The oil should be level with this notch.
"there's a little notch in the case and the oil level should be equal with that notch in the case" -
Dispose of Used Oil Properly
Transfer the used oil to a sealed container and take to your nearest recycling center or designated drop-off facility. Do not pour oil on the ground or down the drain.
Model-Specific Call-Outs: 2010 Kawasaki KX100
- The 2010 KX100 uses a two-stroke engine transmission oil system, not a four-stroke combined engine/transmission, so only change the transmission oil – the premix oil is managed separately.
- Drain bolt is specifically 14mm; confirm with tool before starting to avoid rounding or stripping the bolt.
- Exact capacity is 700ml. Adding too much can cause resistance, while too little risks damaging transmission gears.
- Always use the correct oil spec for two-stroke transmissions and avoid standard automotive engine oil, as proper clutch performance can depend on oil choice.
- If you observe gray or milky oil, this could indicate clutch wear or water intrusion. The oil should be translucent after several changes; persistent discoloration may require service attention.
"why is it gray ... that means you got a problem" - Be cautious tightening the drain plug: the crankcase is aluminum and threads can strip easily.
Recap
- Use the right tools and oil for a quick, confident oil change.
- Do not overtighten bolts.
- Always double-check oil level after filling.
- Dispose of the old oil responsibly.
Regular oil changes are the foundation of reliable KX100 performance. Shop OEM-quality oil and parts at MotoSport.com for all your dirt bike maintenance needs.
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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.