How to Change the Oil in a 1995 Yamaha RT100

Shop parts for a 1995 Yamaha RT100 Dirt Bike.

Changing the oil in your 1995 Yamaha RT100 is a key maintenance task that keeps your bike running smoothly and extends its engine life. This guide, proprietary to MotoSport.com, walks you through the process with model-specific tips, a detailed tool list, and expert notes for RT100 owners.

Tools and Supplies Needed

  • 10mm or 12mm socket wrench (confirm fit with your drain bolt before beginning)
  • Drain pan for capturing old oil
  • Funnel for pouring new oil
  • Replacement oil (consult your owner's manual, but most sources recommend Yamaha 2-stroke oil for the premix system, plus SAE 10W-30 or 10W-40 for the transmission)
  • Shop rags/paper towels for clean-up
  • Gloves for hand protection
  • Flathead screwdriver (if removing panels for easier access)
  • Replacement crush washer (optional, if the old one is worn or damaged)

Preparation

  • Warm up the engine:– Start your RT100 and let it idle for 5-10 minutes. This helps the oil thin out, letting it drain faster and more completely.
  • Shut off the bike:– Place it on a level surface using the kickstand. Make sure the engine is off and the bike is cool enough to touch before you begin draining the oil.

Step-by-Step Oil Change Process

  1. Remove any obstructing panels.
    • Use a screwdriver if necessary; the RT100's panel removal is straightforward. Reference your owner's manual for specifics on the 1995 model's body setup if panels block the drain bolt (manuals include illustrated diagrams for help).
  2. Locate the oil drain plug.
    • On the 1995 RT100, the drain bolt for the transmission is located on the bottom left side of the engine case. Place your drain pan directly beneath it.
  3. Loosen the oil fill cap (dipstick).
    • This relieves pressure and allows oil to flow out more quickly when you remove the drain plug.
  4. Remove the drain plug and drain the oil.
    • Use your socket wrench (commonly 10mm or 12mm). Allow oil to drain completely–tilting the bike gently can help remove the last bit, but do so carefully to avoid spills.
    • Inspect the crush washer on the drain bolt; replace if it's flattened or damaged to prevent leaks.
  5. Clean and reinstall the drain plug.
    • Wipe off any metal debris or sludge from the magnetic tip (if equipped). Reinstall and tighten the plug securely–don't over-torque.
  6. Add new oil.
    • Insert the funnel into the fill hole. For the 1995 RT100, the typical oil capacity is about 650ml (check your manual to confirm). Pour the oil slowly, and check the level using your dipstick if provided.
    • For 2-stroke engines like the RT100, remember oil for the premix must be managed separately per Yamaha's specifications — this procedure is for the transmission oil.
  7. Check the oil level.
    • With the bike upright, insert and remove the dipstick to verify the oil level is between the min and max marks. Add oil if necessary, but do not overfill.
  8. Dispose of old oil responsibly.
    • Never pour oil down a drain or onto the ground. Take it to a recycling center or auto parts store that accepts used engine oil.
  9. Reinstall any removed panels.
    • Make sure all screws are tightened and panels are secure before riding.

Important Model-Specific Tips for the 1995 Yamaha RT100

  • No oil filter:– The RT100's transmission uses simple gear oil and does not feature a serviceable oil filter, so the change is faster compared to many 4-stroke models.
  • Verify oil type:– Use only the recommended transmission oil; do not use standard 2-stroke premix oil for the gearbox. Consult your owner's manual for the exact oil type and capacity.
  • Premix system:– The RT100 runs a separate premix oil system for the engine; the oil change outlined here is for the transmission/gearbox oil only. Always monitor both systems for proper maintenance.
  • Oil check:– Due to the design, always check the oil level after filling and after your first short ride. Top off if necessary, as residual oil can be trapped in passages and may settle post-change.

Additional Advice & Troubleshooting

  • Always check for leaks at the drain plug and fill cap after your first ride post-change.
  • If you have difficulty locating parts or require diagrams, refer to the comprehensive parts manual and service manual for the 1995 RT100. These manuals provide illustrated locator guides for bolts and panels.

With these steps and checks, your 1995 Yamaha RT100 will be ready for reliable rides and long engine life. For all your maintenance supplies, tools, and replacement parts, visit MotoSport.com—your dedicated source for authentic Yamaha service products.

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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.