![](https://motoinstruction.ru/img/yamaha/3/111826.jpg)
Order | Job/Parts to remove | Quantity | Remarks |
Cylinder head | Refer to «Cylinder head». | ||
1 | Intake valve lifter | 12 | |
2 | Intake valve pad | 12 | |
3 | Intake valve cotter | 24 | |
4 | Intake valve upper spring seat | 12 | |
5 | Intake valve spring | 12 | |
6 | Intake valve stem seal | 12 | |
7 | Intake valve lower spring seat | 12 | |
8 | Intake valve | 12 | |
9 | Intake valve guide | 12 | |
10 | Exhaust valve lifter | 8 | |
11 | Exhaust valve pad | 8 | |
12 | Exhaust valve cotter | 16 | |
13 | Exhaust valve upper spring seat | 8 | |
14 | Exhaust valve spring | 8 | |
15 | Exhaust valve stem seal | 8 | |
16 | Exhaust valve lower spring seat | 8 | |
17 | Exhaust valve | 8 | |
18 | Exhaust valve guide | 8 |
The following procedure applies to all of the valves and related components.
Note: Before removing the internal parts of the cylinder head (e.g., valves, valve springs, valve seats), make sure the valves properly seal.
1. Remove:
- Valve lifter «1»
- Valve pad «2»
Note: Make a note of the position of each valve lifter and valve pad so that they can be reinstalled in their original place.
![](https://motoinstruction.ru/img/yamaha/3/111827.jpg)
2. Check:
- Valve sealing
Leakage at the valve seat → Check the valve face, valve seat, and valve seat width.
Refer to «Checking the valve seats».
a. Pour a clean solvent «a» into the intake and exhaust ports.
b. Check that the valves properly seal.
Note: There should be no leakage at the valve seat ‘И »
![](https://motoinstruction.ru/img/yamaha/3/111828.jpg)
3. Remove:
- Valve cotters «1»
Note: Remove the valve cotters by compressing the valve spring with the valve spring compressor «2» and the valve spring compressor attachment «3».
Valve spring compressor: 90890-04019 YM-04019
Valve spring compressor attachment: 90890-04108
Valve spring compressor adapter (22 mm): YM-04108
Valve spring compressor attachment: 90890-04114
Valve spring compressor adapter: YM-04114
![](https://motoinstruction.ru/img/yamaha/3/111829.jpg)
4. Remove:
- Upper spring seat «1»
- Valvespring«2»
- Valve stem seal «3»
- Lower spring seat «4»
- Valve «5»
Note: Identify the position of each part very carefully so that it can be reinstalled in its original place.
![](https://motoinstruction.ru/img/yamaha/3/111830.jpg)