Yamaha XT250X 2008, Service Manual

Page: 169 / 282

VALVES AND VALVE SPRINGS
5-23
EAS24340
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)
3. Install:
●
Valve spring seat “1”
●
Valve stem seal “2”
●
Valve “3”
●
Inner valve spring “4”
●
Outer valve spring “5”
●
Valve spring retainer “6”
(on to the cylinder cylinder head)
NOTE:
●
Make sure each valve is installed in its original
place. Refer to the following embossed marks.
Intake valve: “5HO:”
Exhaust valve: “5BP”
●
Install the valve springs with the larger pitch “a”
facing up.
4. Install:
●
Valve cotters “1”
NOTE:
Install the valve cotters by compressing the
valve spring with the valve spring compressor
“2”.
5. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a soft-face
hammer.
CAUTION:
ECA13800
Hitting the valve tip with excessive force
could damage the valve.
Recommended lubricant
Molybdenum disulfide oil
New
a. Larger pitch
b. Smaller pitch
Valve spring compressor
90890-04019
YM-04019
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