Yamaha XMAX YP125R - Service manual > Installing the valves

The following procedure applies to all of the valves and related components.

1. Deburr:

• Valve stem end (with an oil stone)

2. Lubricate:

• Valve stem "1"
• Valve stem seal "2" (with the recommended lubricant)

Recommended lubricant Molybdenum disulfide oil

3. Install:

• Lower spring seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Upper spring seat "5" (into the cylinder head)

TIP

• Make sure each valve is installed in its original place.
• Install the valve springs with the larger pitch "a" facing up.

b. Smaller pitch

4. Install:

• Valve cotters "1"

TIP

Install the valve cotters by compressing the valve spring with the valve spring compressor and the valve spring compressor attachment "2".

Valve spring compressor 90890-04019 YM-04019

Valve spring compressor attachment 90890-04108

Valve spring compressor adapter 22 mm YM-04108

5. To secure the valve cotters onto the valve stem, lightly tap the valve tip with a soft-face hammer.

NOTICE

Hitting the valve tip with excessive force could damage the valve.

See also: