Yamaha MBK X-MAX 300 2017 Service Manual page 226

• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Engine oil
3. Install:
• Valve spring seat "1"
• Valve stem seal "2"
• Valve "3"
• Valve spring "4"
• Valve spring retainer "5"
(into the cylinder head)
TIP
• Make sure each valve is installed in its original
place.
• Install the valve springs with the larger pitch "a"
facing up.
1
3
b. Smaller pitch
4. Install:
• Valve cotters "1"
E
New
5
4
2 New
VALVES AND VALVE SPRINGS
TIP
Install 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
90890-06320
1
5. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a soft-face
hammer.
ECA13800
NOTICE
Hitting the valve tip with excessive force
could damage the valve.
6. Install:
• Valve pads
5-31
2