How to Change the Oil in a 1993 KAWASAKI KX80 BIG WHEEL

Shop parts for a 1993 KAWASAKI KX80 BIG WHEEL Dirt Bike.

Regular maintenance of your Kawasaki KX80 Big Wheel keeps your bike performing at its best. One of the most critical—and simple—tasks is changing the transmission oil. For a 2-stroke like the 1993 KX80 Big Wheel, this oil lubricates the transmission and clutch, rather than the engine itself. Below, you'll find a step-by-step guide proprietary to MotoSport.com, with all the details specific to this model year.

Tools and Supplies Needed

  • Metric socket set (14mm socket is standard for drain bolt)
  • Ratchet wrench
  • Drain pan
  • Funnel
  • Measuring cup or graduated oil container (to measure 700 milliliters)
  • Shop rag
  • Replacement crush washer (optional but recommended)
  • 10W-40 motorcycle transmission oil or suitable 2-stroke gearbox oil (e.g., Maxima MTL 75W) (Do not use car motor oil)
  • Gloves (optional, for cleanliness)

Oil Type and Capacity for 1993 KX80 Big Wheel

  • Recommended Oil: 10W-40 transmission oil or a specific 2-stroke transmission fluid (such as Maxima MTL 75W)
  • Oil Capacity: 700 milliliters

Model-Specific Call-Outs

  • For the 1993 KX80 Big Wheel, always use 2-stroke transmission oil, not 4-stroke engine oil. The oil lubricates the clutch and gears only; engine lubrication comes from mixed fuel.
  • The drain bolt is located at the bottom of the transmission case. Use caution not to overtighten when reinstalling the bolt to avoid stripping the threads, which are relatively soft on these vintage cases.
  • Oil level is checked at the inspection bolt or level hole on the clutch side cover. Be sure the bike is upright and level when checking.
  • Change every 5 to 10 hours of riding or sooner with heavy clutch use or after muddy rides.

Step-by-Step Oil Change Procedure

  1. Warm up the Engine Briefly
    • Start the bike and let it idle for 1-2 minutes. This helps the oil flow out smoothly and carry away sediment.
    • Shut the engine down before proceeding and let it cool enough to avoid burns.
  2. Set Up Your Work Area
    • Place the bike on a stable stand so it is vertical and secure.
    • Position your drain pan under the transmission drain bolt.
  3. Remove the Drain Bolt
    • Using a 14mm socket, loosen and remove the lower drain bolt beneath the transmission.
    • Allow all oil to fully drain into the pan. Inspect the old oil for excessive metal shavings (some fine dust is normal).
    • If present, remove and replace the crush washer on the bolt.
  4. Replace the Drain Bolt
    • Once drained, clean the bolt and case area.
    • Thread the bolt in by hand, then snug with your socket (do not overtighten.) or you risk stripping the case. Typical torque: around 10-12 ft-lbs is sufficient for this bolt.
  5. Add New Oil
    • Place funnel in the oil fill port located on the side of the engine case.
    • Using your measuring cup, add exactly 700 milliliters of 10W-40 transmission oil. Carefully pour the oil in to avoid spills.
    • Replace and tighten the oil fill cap.
  6. Check the Oil Level
    • Hold the bike upright and remove the oil level inspection bolt (usually a small bolt on the right/crankcase cover). Oil should just reach this hole–if it flows out, let it drain to the proper level.
    • Reinstall and tighten the inspection bolt.
  7. Final Steps
    • Wipe down any oil residue. Double-check all bolts for tightness.
    • Dispose of used oil responsibly at an approved recycling center.
    • Check for leaks after the first ride and top off if necessary.

Additional Tips for 1993 KX80 Big Wheel Owners

  • The clutch and gearbox share oil; frequent changes help extend clutch life significantly.
  • Always use oil specifically for 2-stroke transmissions–automotive oils can cause clutch slippage or premature part wear.
  • If the drain bolt threads feel soft or are easily cross-threaded, consider using a torque wrench or replacing weakened parts.
  • After muddy or wet riding, change oil sooner to avoid premature clutch wear from dirty oil.

Replacement Oil & Parts

  • Compatible oil options: Maxima MTL Transmission Fluid 75W meets requirements for the KX80 Big Wheel.
  • Crush washers are inexpensive–replace every few oil changes for a secure, leak-free seal.

Following these steps ensures your 1993 Kawasaki KX80 Big Wheel—s transmission and clutch remain in peak operating condition for years to come. Regular oil changes are essential maintenance for every serious rider.

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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.