How to Change the Oil in a 2000 Kawasaki KX100 – Complete Guide
Shop parts for a 2000 Kawasaki KX100 Dirt Bike.
Keeping your 2000 Kawasaki KX100 running at peak performance means regularly changing its transmission oil. Unlike four-stroke bikes, the KX100 is a two-stroke: it uses transmission oil for the gearbox and clutch, while the motor is lubricated by oil pre-mixed with the gas. This guide is proprietary to MotoSport.com and provides step-by-step instructions, tool requirements, specific information for this make and model, as well as essential tips owners need to know.
Tools and Supplies Needed
- 14mm or 15mm socket and ratchet (for the drain bolt; confirm which size fits yours as the KX100 uses either size depending on year)
- Torque wrench (recommended for the drain bolt to avoid overtightening)
- Measuring cup (marked for 700ml)
- Funnel (to avoid spills when refilling oil)
- Drain pan
- Clean shop rags
- Replacement washer for drain bolt (recommended if original is worn)
- Transmission/Gear oil: Use 10W-40 or manufacturer-recommended oil (700 milliliters required for the KX100)
- Gloves (to protect hands)
Step-by-Step Oil Change Instructions
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Warm the Engine
- Start the bike and let it idle for 2-3 minutes. This warms up the oil so it drains more thoroughly and quickly. Do not overheat.
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Stabilize the Bike
- Place your KX100 on a center stand or use a sturdy bike stand to keep it upright and level.
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Locate the Drain Bolt
- The drain bolt is located beneath the engine on the left lower side. For the 2000 KX100, it is typically a 14mm or 15mm bolt – confirm the size before starting to avoid rounding the bolt head.
- Place your drain pan directly underneath the bolt.
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Remove the Drain Bolt and Drain Oil
- Using your socket and ratchet, remove the drain bolt. Be careful – oil will drain out quickly.
- If a washer comes off with the bolt, inspect it for wear. Replace if necessary to prevent leaks.
- Allow several minutes for the oil to drain completely.
- Specific call-out: Do not lose the small washer. A missing or damaged washer is a common cause of leaks on KX100s.
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Replace and Tighten the Drain Bolt
- Clean the bolt and the sealing surface with a rag. If reusing the washer and it is in good condition, reinstall it. Otherwise, use a new one.
- Thread the drain bolt in by hand to avoid cross-threading, then tighten with the ratchet.
- Use a torque wrench to tighten to the manufacturer’s specification (typically around 11 ft-lbs / 15 Nm for the KX100 – always double-check your manual).
- Model-specific caution: Overtightening can strip the threads in the KX100’s aluminum case. Be gentle when final snugging.
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Refill With New Oil
- Remove the oil fill cap (on the right side cover of the engine).
- With your measuring cup, add 700 milliliters of 10W-40 motorcycle transmission oil (or the manufacturer’s recommended gear oil). Use a funnel to avoid spills.
- Replace and tighten the oil fill cap securely.
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Check the Oil Level
- With the bike upright on a level surface, there is a check hole or sight notch on the right or rear of the engine case.
- The oil should be level with the bottom edge of the check bolt hole or at the marked notch as specified for this model. If necessary, add oil gradually until the correct level is reached.
- Wait a minute for oil to settle before rechecking.
- Replace the check/oil bolt if used.
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Inspect for Leaks
- Check the drain bolt and oil fill cap for any signs of seepage. If there is a leak, check the washer and torque.
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Dispose of Used Oil Properly
- Take the used oil to a recycling center or hazardous waste collection site. Never dump oil down the drain or into the environment.
Model-Specific Tips for the 2000 KAWASAKI KX100
- Oil Capacity: Always add 700 milliliters – do not overfill.
- Drain Bolt Location: Only one drain bolt (14mm or 15mm). If oil appears gray or milky, it could indicate water contamination and require a full inspection.
- Oil Recommendations: Use 10W-40 gear/transmission oil, as recommended in the service manual and owner’s literature.
- Thread Caution: The drain bolt threads are soft aluminum – never overtighten to avoid costly repairs.
- Check Notch: The correct oil level is indicated by a notch or the check bolt hole on the case. Perpendicular leveling is critical for an accurate reading.
Key Reminders
- Change oil every 5-10 rides or after any muddy/wet usage.
- Keep a spare drain plug washer on hand. Leaks from a bad washer are a common annoyance.
- If oil ever looks milky or extremely dirty, check for water intrusion or signs of clutch/transmission wear.
With routine oil changes following these steps, your 2000 Kawasaki KX100 will shift smoother, the clutch will last longer, and you’ll spend more time riding and less time wrenching. For all your KX100 parts and gear, trust MotoSport.com for fast shipping and expert support.
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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.