How to Change the Oil in a 1996 Yamaha RT100: Step-By-Step Guide

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Changing the oil in your 1996 Yamaha RT100 is essential periodic maintenance that promotes smooth transmission operation and extends the lifespan of your dirt bike. This guide, proprietary to MotoSport.com, is tailored to the unique specifications of the RT100 and will walk you through the entire process, highlighting special model-specific details and safety tips.

Tools and Supplies Needed

  • 17mm socket wrench or spanner (for the drain bolt)
  • Oil catch pan
  • Funnel
  • Clean lint-free rag
  • SAE 10W-30 or SAE 10W-40 motorcycle transmission oil (as specified by Yamaha; check your owner's manual for any updates)
  • Torque wrench (with Nm setting)
  • Replacement drain plug washer (recommended, but not always necessary)
  • Gloves

Preparation

  • Ensure the bike is on a firm, flat surface and secured on a stand so it remains upright and stable throughout the process.
  • Warm up the engine for a few minutes. This helps suspend contaminants in the oil, ensuring a more thorough drain.
    Caution: Warm oil flows better but be careful when draining to avoid burns.
  • Turn off the engine and allow it to sit for a minute so the oil can settle.

Steps to Change the Oil

  1. Locate the Drain Plug
    The drain plug is found on the bottom of the right engine case. Place the oil pan underneath the drain plug to catch old oil.
  2. Remove the Oil Filler Dipstick
    On the Yamaha RT100, the dipstick is also the oil fill cap and is located on the right side of the engine case. Unscrew and remove it to allow oil to drain smoothly.
  3. Drain the Old Oil
    With your 17mm wrench, loosen and remove the drain plug. Let all of the transmission oil drain into the catch pan. Tilt the bike only if needed to ensure complete drainage, but always return the bike to an upright position before refilling to guarantee an accurate oil level reading.
    Note: Do not tip the bike onto the side stand when checking or filling the oil, as this will give a false reading.
  4. Inspect and Replace the Washer
    Inspect the drain plug sealing washer. Replace it if it is damaged or crushed. This helps prevent leaks.
  5. Reinstall the Drain Plug
    Clean the drain plug and reinstall by hand, then tighten to the specified torque: 20 Nm (2.0 kgf·m) using your torque wrench. Over-tightening can strip threads; under-tightening can cause leaks.
  6. Add Fresh Transmission Oil
    Using a funnel, pour fresh oil into the filler hole. For the 1996 Yamaha RT100, the typical capacity is 750 ml (0.80 US qt) but always reference your manual. Pour half the capacity, pause, then finish to prevent overfilling.
    Recommended oil: SAE 10W-30 or 10W-40; never use engine oil intended for four-stroke motors.
  7. Check Oil Level
    Insert the dipstick without screwing it in, then remove and inspect the oil level. The oil should be between the minimum and maximum marks. Add oil in small increments as needed.
    Wait a few minutes after filling before checking, as the level may settle.
  8. Reinstall the Dipstick/Filler Cap
    Once at the correct level, reinstall and securely tighten the dipstick/filler cap by hand.
  9. Dispose of Used Oil Properly
    Transfer the used oil to a sealed container and take it to an approved recycling or disposal facility. Never dispose of oil in a drain or on the ground.
  10. Inspect for Leaks and Test Ride
    Start the engine and let it idle for a minute. Check for leaks around the drain plug and filler cap. After shutting off the engine, re-check the oil level and top up if necessary.

Model-Specific Call-Outs for the 1996 Yamaha RT100

  • This is a two-stroke motorcycle. Engine and transmission use separate lubrication systems.
  • The RT100 transmission oil lubricates the clutch and gear sets only. Never substitute with automatic transmission fluid or non-specified engine oil.
  • The bike does not use an oil filter in the transmission system; changes are especially important to keep contaminants at bay.
  • If the bike is allowed to tip or rest on the sidestand when checking the oil, the level will read high and may cause underfilling. Always check and fill with the bike upright and level.
  • Inspect for any leaks around the case and drain plug at every oil change; seals on older bikes may become brittle.

Maintenance Tips

  • Change your RT100 transmission oil every 10 hours of riding or at least every season.
  • Regular oil changes help detect early issues, such as metallic shavings or milkiness (may indicate water intrusion).
  • Keep a log of each oil change, including date and hours of operation, to stay on top of maintenance.

Conclusion

Routine oil changes are the cornerstone of preventive maintenance for your Yamaha RT100. By following these steps and using only manufacturer-recommended oils and torque values, you’ll ensure your two-stroke continues to deliver reliable performance, season after season. For all your dirt bike maintenance needs and OEM parts, trust the experts at MotoSport.com.

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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.