Installing The Valves - Yamaha XT250X 2008 Service Manual

EAS24340

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
Valve stem end
G
(with an oil stone)
2. Lubricate:
Valve stem "1"
G
Valve stem seal "2"
G
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
Valve spring seat "1"
G
Valve stem seal "2"
New
G
Valve "3"
G
Inner valve spring "4"
G
Outer valve spring "5"
G
Valve spring retainer "6"
G
(on to the cylinder cylinder head)
NOTE:
Make sure each valve is installed in its original
G
place. Refer to the following embossed marks.
Intake valve: "5HO:"
Exhaust valve: "5BP"
Install the valve springs with the larger pitch "a"
G
facing up.
All manuals and user guides at all-guides.com
VALVES AND VALVE SPRINGS
5-23
a. Larger pitch
b. Smaller pitch
4. Install:
Valve cotters "1"
G
NOTE:
Install the valve cotters by compressing the
valve spring with the valve spring compressor
"2".
Valve spring compressor
90890-04019
YM-04019
5. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a soft-face
hammer.
ECA13800
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.