1. Preparation:
- Gather the necessary tools and parts, including a piston, ring, circlips, and a piston ring compressor.
- Ensure the piston and cylinder are clean and free from debris.
2. Install the Piston Ring:
- Position the piston ring in the piston ring groove, making sure it is seated correctly.
- Use a piston ring compressor to compress the ring and insert it into the groove.
- Repeat this process for the remaining piston rings.
3. Install the Piston Pin:
- Insert the piston pin into the piston and connecting rod.
- Secure the piston pin with the circlips on both sides.
- Verify that the piston pin is properly seated and moves smoothly.
4. Lubrication:
- Apply a thin layer of two-stroke engine oil to the piston, piston rings, and cylinder walls to reduce friction during initial start-up.
5. Piston Installation:
- Carefully insert the piston into the cylinder, making sure the piston ring gaps are staggered, and the piston is aligned correctly.
- Gently tap the piston into the cylinder using a suitable tool, such as a rubber mallet or piston seating tool, until it is fully seated.
- Check the piston movement to ensure it moves smoothly up and down the cylinder.
6. Secure the Piston:
- Install the circlips onto the piston pin to secure the piston in place.
7. Head Installation:
- Reinstall the cylinder head following the proper procedures specified in your motorcycle's service manual.
- Ensure the cylinder head gasket is seated correctly, and the bolts are tightened according to the recommended torque specifications.
After installing the piston and ring, it's essential to follow proper break-in procedures as outlined in your motorcycle's owner's manual to ensure the longevity of the engine. Please note that this guide is a general overview, and specific details may vary depending on the exact model and year of your Honda CR 125. It's always recommended to consult your motorcycle's service manual for accurate instructions and specifications for your specific bike.
