Yamaha XMAX YP125R - Service manual > Valves and valve springs
Removing the valves and valve springs
Removing the valves
The following procedure applies to all of the valves and related components.
TIP
Before removing the internal parts of the cylinder head (e.g., valves, valve springs, valve seats), make sure the valves properly seal.
1. Check:
- Valve sealing
Leakage at the valve seat → Check the valve face, valve seat, and valve seat width.
a. Pour a clean solvent "a" into the intake and exhaust ports.
b. Check that the valves properly seal.
TIP
There should be no leakage at the valve seat "1".
2. Remove:
- Valve cotters "1"
TIP
Remove 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
3. Remove:
- Upper spring seat "1"
- Valve spring "2"
- Valve "3"
- Valve stem seal "4"
- Lower spring seat "5"
TIP
Identify the position of each part very carefully so that it can be reinstalled in its original place.
See also:
Yamaha XMAX YP125R - Service manual > Camshaft (YP125R)
Removing the rocker arms and camshaft Removing the camshaft
Yamaha XMAX YP125R - Service manual > Checking the valves and valve guides
The following procedure applies to all of the valves and valve guides. 1. Measure: Valve-stem-to-valve-guide clearance Out of specification → Replace the valve guide.
