Unlock Easy Maintenance: How To Remove Spark Plug Of Mio I 125

Main points

Knowing how to change your spark plug can be a valuable skill, saving you money on mechanic fees and giving you a sense of accomplishment.
On the Mio I 125, the spark plug is located on the top of the engine cylinder head, near the front of the motorcycle.
Using the spark plug socket and wrench, place the socket over the spark plug and turn it counter-clockwise.

Are you ready to tackle a basic motorcycle maintenance task? This guide will walk you through the process of how to remove spark plug of Mio I 125, step-by-step. Knowing how to change your spark plug can be a valuable skill, saving you money on mechanic fees and giving you a sense of accomplishment.

Why Change Your Spark Plug?

The spark plug is a crucial component of your Mio I 125’s ignition system. It generates the spark that ignites the air-fuel mixture in the combustion chamber, powering your engine. Over time, spark plugs wear out, leading to:

Reduced engine performance: A worn-out spark plug can cause misfires, leading to a loss of power and acceleration.
Increased fuel consumption: A faulty spark plug can disrupt the combustion process, resulting in inefficient fuel burning and higher fuel consumption.
Rough idling: A worn-out spark plug can cause the engine to idle erratically.
Hard starting: A faulty spark plug can make it difficult to start your motorcycle.

To prevent these issues, it’s essential to replace your spark plug at regular intervals. Yamaha recommends changing the spark plug on the Mio I 125 every 12,000 kilometers or 12 months, whichever comes first.

What You’ll Need

Before you begin, gather the following tools and materials:

Spark plug socket: This specialized socket fits over the spark plug and allows you to loosen and tighten it.
Wrench: You’ll need a wrench that fits the size of the spark plug socket.
New spark plug: Ensure you purchase a spark plug that’s compatible with your Mio I 125. Consult your motorcycle’s owner’s manual for the correct type and specifications.
Gloves: Protect your hands from grease and dirt.
Cleaning cloth: For wiping down parts.
Safety glasses: Protect your eyes from debris.

Safety First

Before working on your motorcycle, always prioritize safety:

Park your motorcycle on a level surface: This prevents it from rolling while you’re working.
Engage the parking brake: This ensures the motorcycle remains stationary.
Wear appropriate safety gear: This includes gloves, safety glasses, and closed-toe shoes.
Disconnect the battery: This prevents electrical shocks. Locate the battery, and disconnect the negative terminal (the black cable) first, followed by the positive terminal (the red cable).

How to Remove the Spark Plug: A Step-by-Step Guide

Now, let’s dive into the process of removing the spark plug:

1. Locate the spark plug: On the Mio I 125, the spark plug is located on the top of the engine cylinder head, near the front of the motorcycle. You’ll likely see a small, round metal cap with a wire attached to it.

2. Disconnect the spark plug wire: Carefully pull the spark plug wire off the spark plug. The wire should come off easily with a gentle tug.

3. Loosen the spark plug: Using the spark plug socket and wrench, place the socket over the spark plug and turn it counter-clockwise. Be careful not to overtighten the socket, as this can damage the spark plug. You may need to apply some force to loosen the spark plug, especially if it’s been in place for a while.

4. Remove the spark plug: Once the spark plug is loose, you can remove it completely by hand. Be careful not to drop it, as this can damage the threads.

Inspecting the Old Spark Plug

Before installing the new spark plug, take a moment to inspect the old one:

Check the electrode gap: The electrode gap is the space between the center electrode and the side electrode. The gap should be within the specifications listed in your owner’s manual. If the gap is too large or too small, it can affect engine performance.
Check the condition of the electrodes: The electrodes should be clean and free of any deposits. If the electrodes are heavily corroded or worn, it’s a sign that the spark plug needs to be replaced.
Check for cracks or damage: Inspect the spark plug for any cracks or damage to the ceramic insulator or metal housing. A cracked or damaged spark plug should be replaced immediately.

Installing the New Spark Plug

Now, it’s time to install the new spark plug:

1. Clean the spark plug threads: Use a cleaning cloth to wipe away any dirt or debris from the spark plug threads.

2. Install the new spark plug: Carefully thread the new spark plug into the cylinder head. Tighten it by hand until it’s snug, but don’t overtighten it.

3. Tighten the spark plug with the wrench: Use the spark plug socket and wrench to tighten the spark plug to the specified torque. The torque value is usually listed in your owner’s manual. Overtightening the spark plug can damage the threads, so be careful.

4. Reconnect the spark plug wire: Carefully connect the spark plug wire to the new spark plug. Ensure the wire is securely connected.

Final Steps

1. Reconnect the battery: Reconnect the battery terminals in the reverse order of how you disconnected them. Connect the positive terminal first, followed by the negative terminal.

2. Start the engine: Start your motorcycle and let it run for a few minutes to ensure everything is working properly. Listen for any unusual noises or signs of problems.

3. Test drive: Take your motorcycle for a test drive to ensure the spark plug installation was successful. Check for improved engine performance, smoother idling, and easier starting.

Maintaining Your Spark Plug

To keep your spark plug in optimal condition, follow these tips:

Use high-quality fuel: Using high-quality fuel helps to reduce carbon buildup on the spark plug electrodes.
Regularly check the spark plug gap: Check the spark plug gap every 12,000 kilometers or 12 months. If the gap is outside the specified range, adjust it using a spark plug gap tool.
Replace the spark plug at the recommended intervals: Replace your spark plug every 12,000 kilometers or 12 months, as recommended by Yamaha.

Time to Shine: Your Mio I 125 Spark Plug is Ready!

You’ve successfully tackled the task of removing and replacing the spark plug on your Mio I 125! With a little time and effort, you can perform this essential maintenance yourself, saving money and gaining valuable knowledge about your motorcycle. Remember to always prioritize safety and consult your owner’s manual for specific instructions and torque values.

Unlock Easy Maintenance: How to Remove Spark Plug of Mio I 125