How to Change the Oil in a 1997 Kawasaki KX100: Step-by-Step Guide
Shop parts for a 1997 Kawasaki KX100 Dirt Bike.
Changing the oil on your 1997 Kawasaki KX100 is straightforward but essential for optimal performance and engine longevity. The KX100 uses a two-stroke engine where the oil you'll be changing is the transmission oil. Proper oil maintenance ensures smooth gear shifting and protects vital components in the gearbox. This robust guide from MotoSport.com details the process, including tools, tips, and model-specific call-outs.
Tools and Supplies Needed
- 14mm socket or wrench (for the drain bolt)
- Ratchet and extension (for easier access)
- Measuring cup (with milliliter markings)
- Small funnel
- Drain pan (to collect old oil)
- Clean rags or shop towels
- Fresh transmission oil (see below for quantity and type)
- Latex or nitrile gloves (optional, for cleaner hands)
Recommended Oil and Quantity
- Oil type: High-quality 2-stroke transmission oil (consult manual; many use 10W-40 or similar non-synthetic oil)
- Oil quantity: 700 milliliters
Step-by-Step Instructions
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Warm up the Bike
- Start your KX100 and let it idle for 1-2 minutes. This warms the oil, making it drain more thoroughly and quickly.
(Warming the bike helps the oil drain faster) - Turn off the bike and ensure it's stable, ideally using a stand to keep it upright and level.
- Start your KX100 and let it idle for 1-2 minutes. This warms the oil, making it drain more thoroughly and quickly.
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Remove the Drain Plug
- Locate the drain plug on the bottom of the engine case (left side, near the gear shifter).
- Use the 14mm socket or wrench to carefully loosen and remove the drain plug. Watch for a crush washer; don't lose it as it helps prevent leaks.
“There’s only one drain plug and it’s right here, 14mm”. - Allow the old oil to drain fully into your oil pan. This might take several minutes.
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Inspect the Old Oil
- Observe the color and consistency of the drained oil. Milky or gray oil may indicate water contamination and warrants further inspection.
“Well that’s not a very good color… that means you got a problem.” - Check for metal shavings or debris, a sign of possible internal wear.
- Observe the color and consistency of the drained oil. Milky or gray oil may indicate water contamination and warrants further inspection.
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Replace the Drain Plug
- Clean the plug and replace the crush washer if damaged. Reinstall the drain plug by hand, then gently snug with your wrench or socket — do not overtighten to avoid stripping the threads.
“Be careful not to snug this green bolt down too tight or you’ll strip the threads.”
- Clean the plug and replace the crush washer if damaged. Reinstall the drain plug by hand, then gently snug with your wrench or socket — do not overtighten to avoid stripping the threads.
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Add Fresh Oil
- Measure 700 milliliters of fresh 2-stroke transmission oil using your measuring cup.
- Insert your funnel into the oil fill hole (left side, forward of the shifter).
- Slowly pour in the oil. Replace and hand-tighten the oil cap when finished.
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Check the Oil Level
- Remove the bike from its stand and position it perfectly upright (not tilted).
- Locate the oil check notch on the case behind the fill area. The oil level should be flush with this notch.
“The oil level should be equal with that notch in the case.” - If low, top off with small increments of oil, being careful not to overfill.
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Final Steps
- Double-check that the drain plug and filler cap are secure.
- Start the bike and let it idle briefly, then re-check oil level, adding if necessary.
- Dispose of the old oil responsibly at a local recycling center.
KX100-Specific Call-Outs (1997 Model Year)
- Only a single drain bolt: No need to look for multiple plugs as on some four-stroke or larger bikes.
- Threaded drain plug: Be especially gentle reinstalling; the aluminum case threads strip easily on these bikes.
- Exact oil quantity: 700ml is precise for both the 1997 KX100 and most subsequent KX100 models.
- Milky or gray oil likely indicates a leaking seal or water intrusion—investigate promptly to prevent damage.
- Don’t overfill: Too much oil can cause frothing and poor clutch action.
Quick Tips
- Change your transmission oil every 5–10 hours of riding, or more frequently in harsh conditions.
- Always use high-quality oil specifically for two-stroke transmission/clutch systems to ensure proper performance and longevity.
- If you ride in wet or muddy conditions, consider changing oil more often.
With this straightforward process, you’ll keep your 1997 Kawasaki KX100 running strong and extend the life of your transmission. For OEM and aftermarket KX100 parts, gear, and additional tech tips, count on MotoSport.com — your dirt bike authority.
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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.