Yamaha YZF-R125 Service Manual: Assembling the front fork legs

The following procedure applies to both of the front fork legs.

NOTE:

When assembling the front fork leg, be sure to replace the following parts:

• Outer tube bushing
• Oil seal
• Dust seal
• Clip

Before assembling the front fork leg, make sure all of the components are clean.

1. Install:

• Damper rod

2. Lubricate:

• Inner tube's outer surface

3. Tighten:

• Damper rod bolt "1"

NOTE:

While holding the damper rod with the damper rod holder "2" and T-handle "3", tighten the damper rod bolt.

4. Install:

• Outer tube bushing "1"
• Washer "2" (with the fork seal driver weight "3" and fork seal driver attachment "4")

5. Install:

• Oil seal "1"
  (with the fork seal driver weight "2" and fork seal driver attachment "3")

NOTE:

• Before installing the oil seal, lubricate its lips with lithium-soap-based grease.
• Lubricate the outer surface of the inner tube with fork oil.
• Before installing the oil seal, cover the top of the front fork leg with a plastic bag to protect the oil seal during installation.

6. Install:

• Oil seal clip "1"

NOTE:

Adjust the oil seal clip so that it fits into the outer tube's groove.

7. Install:

• Dust seal "1"
  (with the fork seal driver weight "2")

8. Fill:

• Front fork leg (with the specified amount of the recommended fork oil)

9. After filling the front fork leg, slowly stroke the inner tube "1" up and down (at least ten times) to distribute the fork oil.

NOTE:

Be sure to stroke the inner tube slowly because the fork oil may spurt out.

10.Before measuring the fork oil level, wait ten minutes until the oil has settled and the air bubbles have dispersed.

NOTE:

Be sure to bleed the front fork leg of any residual air.

11.Measure:

Front fork leg oil level "a" (from the top of the inner tube, with the inner tube fully compressed and without the fork spring) Out of specification Correct.

12.Install:

• Fork spring "1"

NOTE:

Install the spring with the smaller pitch "a" facing up.

13.Install:

• O-ring
  (to front fork cap)
• Front fork cap
• Clip

NOTE:

• Before installing the front fork cap, lubricate its O-ring with grease.
• Insert the front fork cap into the inner tube, and then install the clip, making sure that the cap is securely held in place with the clip.