How to Change Gear Oil Mio I 125: Step-by-Step Tutorial with Video Instructions

Are you looking for a comprehensive guide on how to change gear oil Mio i 125? This blog post will take you through the entire process, ensuring you can perform this essential maintenance task confidently and effectively. Regular gear oil changes are crucial for maintaining your Mio i 125’s performance and longevity. Let’s get started!

Why Change Gear Oil?

Gear oil serves as a lubricant for your Mio i 125’s transmission, reducing friction and wear on the gears, bearings, and other moving parts. Over time, gear oil breaks down due to heat, contamination, and usage, losing its lubricating properties. This can lead to:

• Increased Gear Wear: Friction between gears increases, leading to premature wear and tear.
• Rough Shifting: The transmission may become sluggish and difficult to shift, resulting in a less enjoyable riding experience.
• Noise and Vibration: Worn gears and bearings can produce excessive noise and vibration, particularly at higher speeds.
• Potential Damage: Severe gear oil degradation can cause significant damage to the transmission, leading to costly repairs.

When to Change Gear Oil

Yamaha recommends changing the gear oil in your Mio i 125 every 2,000 kilometers or 6 months, whichever comes first. However, several factors can influence the frequency of gear oil changes, including:

• Riding Conditions: Frequent stop-and-go traffic, harsh weather conditions, and heavy loads can accelerate gear oil degradation.
• Oil Quality: Using low-quality gear oil can lead to faster breakdown.
• Oil Level: Regularly checking the gear oil level and topping it up as needed can help extend its lifespan.

Tools and Materials You’ll Need

Before you begin, gather the following tools and materials:

• New Gear Oil: Refer to your Mio i 125’s owner’s manual for the recommended type and viscosity of gear oil.
• Drain Pan: A container to collect the old gear oil.
• Wrench: A 14mm wrench or socket to loosen the drain plug.
• Torque Wrench: To tighten the drain plug to the correct specification.
• Gloves: To protect your hands from the used gear oil.
• Clean Rags: For wiping up spills and cleaning tools.
• Funnel: To pour the new gear oil into the transmission.

Step-by-Step Guide to Changing Gear Oil

Now, let’s walk through the process of changing the gear oil in your Mio i 125:

1. Warm Up the Engine: Start your Mio i 125 and let it run for a few minutes to warm up the gear oil. This will make it more fluid and easier to drain.
2. Park on a Level Surface: Find a safe and level surface to work on.
3. Locate the Drain Plug: The drain plug is usually located on the bottom of the transmission case. It may be a hexagonal or square-shaped plug.
4. Loosen the Drain Plug: Use the 14mm wrench to loosen the drain plug, but do not remove it completely.
5. Place the Drain Pan: Position the drain pan directly under the drain plug to catch the old gear oil.
6. Remove the Drain Plug: Once the drain plug is loose, carefully remove it and let the old gear oil drain into the pan.
7. Inspect the Drain Plug: Check the drain plug for any signs of damage or wear. If necessary, replace it with a new one.
8. Clean the Drain Plug Area: Use a clean rag to wipe away any oil residue around the drain plug.
9. Replace the Drain Plug: Screw the drain plug back into place and tighten it to the correct specification using a torque wrench. Refer to your owner’s manual for the recommended torque value.
10. Locate the Fill Plug: The fill plug is usually located on the top or side of the transmission case. It may be a hexagonal or square-shaped plug.
11. Loosen the Fill Plug: Use the 14mm wrench to loosen the fill plug.
12. Fill with New Gear Oil: Use a funnel to slowly pour the recommended amount of new gear oil into the transmission through the fill plug hole.
13. Check the Oil Level: Once the transmission is filled, tighten the fill plug to the correct specification. Check the oil level by removing the fill plug and checking if oil comes out. If not, add more oil until it does.
14. Clean Up: Dispose of the used gear oil properly. Wipe up any spills and clean your tools.

Tips for Success

• Wear safety glasses: Protect your eyes from any splashes of oil.
• Use the correct gear oil: Always refer to your Mio i 125’s owner’s manual for the recommended type and viscosity of gear oil.
• Tighten the drain plug securely: A loose drain plug can lead to oil leaks.
• Check for leaks: After changing the gear oil, check for any leaks around the drain plug and fill plug.

Post-Change Maintenance

After changing the gear oil, it’s important to:

• Check the oil level regularly: Ensure the gear oil level remains within the specified range.
• Listen for any unusual noises: If you hear any grinding or rattling sounds, it could indicate a problem with the transmission.
• Inspect for leaks: Look for any signs of oil leaks around the drain plug and fill plug.

Final Thoughts: Maintaining Your Mio i 125

Changing the gear oil in your Mio i 125 is a simple yet essential maintenance task. By following these steps, you can help ensure your transmission operates smoothly and efficiently, extending the life of your motorcycle.

Popular Questions

Q: How often should I change the gear oil in my Mio i 125?

A: Yamaha recommends changing the gear oil every 2,000 kilometers or 6 months, whichever comes first. However, the frequency may vary depending on your riding conditions and oil quality.

Q: What type of gear oil should I use for my Mio i 125?

A: Refer to your Mio i 125’s owner’s manual for the recommended type and viscosity of gear oil. This will usually be a specific type of API GL-4 or GL-5 gear oil.

Q: What happens if I don’t change the gear oil on time?

A: Failing to change the gear oil on time can lead to increased gear wear, rough shifting, noise and vibration, and potential damage to the transmission.

Q: Can I add gear oil to my Mio i 125 without draining the old oil?

A: It’s not recommended to add gear oil without draining the old oil. This can dilute the oil and reduce its effectiveness. It’s best to drain the old oil and replace it with fresh gear oil.

Q: Can I use any type of motorcycle oil for the transmission?

A: No, you should not use regular motorcycle oil for the transmission. Gear oil is specifically formulated for the high pressures and loads experienced in the transmission. Using the wrong oil can damage your transmission.