How to Change the Oil in a 1995 Kawasaki KX125

Shop parts for a 1995 Kawasaki KX125 Dirt Bike.

Keeping the transmission oil fresh in your 1995 Kawasaki KX125 is critical for maintaining smooth shifting and long engine life. While the KX125 is a two-stroke and doesn't use engine oil in the standard sense, it does require routine transmission (gearbox) oil changes. This step-by-step guide from MotoSport.com will show you how to do it yourself, efficiently and correctly, with helpful notes specific to the 1995 KX125.

Tools and Supplies Needed

  • Socket wrench set
  • Drain pan (low-profile is easiest)
  • Funnel
  • Clean rags or shop towels
  • Fresh transmission/gear oil (80W MTL, or as recommended by the manufacturer)
  • Measuring cup (optional but helps with accuracy)
  • Rubber gloves (optional, for cleanliness)

1995 KX125 Transmission Oil Notes

  • Capacity:– Check your owner's manual, but typical transmission oil capacity is ~700ml (approx. 0.74 quarts).
  • Oil Type:– Use quality 2-stroke transmission oil. Brands like Maxima, Motul, or Amsoil 80W are good choices for high-wear, high-temp environments typical of motocross bikes.
    Never use motor oil or 4-stroke engine oil in the gearbox.
  • Drain & Fill Bolts:– For this model, both are easily accessible, but be careful not to overtighten the fill bolt when replacing it; they can strip with too much force.

Step-By-Step Oil Change Procedure

  1. Warm the Engine Briefly (Optional):
    Start the bike and let it idle for 2–3 minutes. This helps the oil warm and flow out more easily. Don't let it get hot—just warm is fine. Turn off the bike and set it securely on a stand.
  2. Locate the Transmission Drain Plug:
    The drain plug is on the bottom left of the engine case. Place your drain pan underneath.
  3. Remove the Drain Plug:
    Use the socket wrench to loosen and remove the drain bolt. Be cautious—oil may be hot. Remove the fill plug (on the side case) to help the oil drain faster.
  4. Drain the Oil Completely:
    Allow all old oil to drain into your pan. Tilting the bike slightly (toward the drain) helps remove as much old oil as possible. Wipe down any drips with rags.
  5. Inspect the Drain Plug:
    The magnetic tip should be free of metal shavings. A little gray paste is normal, but chunks of metal warrant further inspection.
  6. Replace and Tighten the Drain Plug:
    Reinstall the drain plug and tighten securely. Do not overtighten. Stripping the case is a difficult repair and common on older KX models.
  7. Add New Transmission Oil:
    Using your funnel, pour in the recommended volume of fresh gearbox oil (approx. 700ml). A measuring cup like a Ratio Rite ensures accuracy.
  8. Check Oil Level:
    On the KX125, use the oil level check bolt located partway up the clutch cover (side of the engine). Remove the bolt—when oil starts to “weep” out, you have the correct level. Replace the bolt securely.
  9. Replace the Filler Cap:
    Hand-tighten only. Again, do not overtighten to avoid damaging threads.
  10. Wipe Down and Check for Leaks:
    Wipe away spills and check under the engine for drips. Start the engine, let it idle for a minute, then recheck for leaks around both plugs.

Pro Tips for the 1995 Kawasaki KX125

  • Change the gearbox oil every 5–10 riding hours or after every few races for best performance.
  • Always use a new crush washer on the drain plug if it is damaged or leaking. It's a cheap way to prevent future headaches.
  • If you see milky or gray oil, you may have a coolant leak into the transmission—address this immediately.
  • Don't overfill. The KX125 will just push out extra oil through a breather if overfilled, causing unnecessary mess and oil loss.

Model-Specific Call-Outs

  • On 1995 KX125s, the oil level screw is often overlooked. For accurate oil level, always remove this screw after filling and top off until it seeps out. Do not rely solely on a set measurement as clutches and transmission cavities can retain oil differently depending on how thoroughly the old oil was drained.
  • This model has a soft alloy drain plug thread–never use excessive force when tightening either the drain or fill plugs to avoid costly repairs.
  • Some 1995 KX125s may have minor leaks around old gaskets or covers. If you notice recurrent oil loss, inspect and replace worn gaskets as necessary.

Conclusion

Fresh transmission oil is the best low-cost insurance for your 1995 Kawasaki KX125's performance, shifting, and reliability. Use the correct oil type and quantity, and avoid overtightening bolts. Keep these steps and call-outs handy to make oil changes quick and drama-free. For parts, supplies, and expert advice, shop directly with MotoSport.com—your trusted source for dirt bike maintenance and gear.

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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.