Yamaha SR125 Service Manual download pdf (Page 99)

4-19

VALVES AND VALVE SPRINGS

ENG

Molybdenum disulfide oil

New

NOTE:

CAUTION:

2. Apply:

 Molybdenum disulfide oil

(onto the valve stem

and oil seal

)

3. Install:

 Valve spring seat

 Valve stem seat

 Valve

(into the cylinder head)

 Valve spring

 Spring retainer

Install the valve spring with the larger pitch

facing upwards.

Smaller pitch

4. Install:

 Valve cotters

Install the valve cotters while compressing the

valve spring with a valve spring compressor and

attachment

Valve spring compressor:

90890-01253

Valve spring compressor

attachment:

90890-04108

5. Secure the valve cotters onto the valve stem

by tapping lightly with a piece of wood.

Do not hit so much as to damage the valve.

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Ruchira 26 Jul 2025 | 07:58:41

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Yamaha SR125 Service Manual Page 99