Removing The Valves; Checking The Valves And Valve Guides - Yamaha N MAX GPD150-A 2015 Service Manual

EAS30283

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.
Refer to "CHECKING THE VALVE SEATS"
on page 5-25.
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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".
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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
Valve spring compressor
YM-04019
Valve spring compressor attach-
ment
90890-04108
Valve spring compressor adapt-
er 22 mm
YM-04108
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VALVES AND VALVE SPRINGS
3. Remove:
• Valve spring retainer "1"
• Valve spring "2"
• Valve "3"
• Valve stem seal "4"
▼▼▼
• Valve spring seat "5"
TIP
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
EAS30284
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.
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter "a" -
Valve stem diameter "b"
5-23
2
1
5
3
1
2
4