Yamaha YZ450FX 2019 Owner's Service Manual page 229

facing up.
b. Smaller pitch
4. Install:
• Valve cotter "1"
TIP
Install the valve cotters by compressing the
valve spring with the valve spring compressor
"2" and the valve spring compressor attachment
"3".
Valve spring compressor
90890-04019
Valve spring compressor
YM-04019
Valve spring compressor attach-
ment
90890-04108
Valve spring compressor adapter
22 mm
YM-04108
5. To fasten 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.
VALVES AND VALVE SPRINGS
6. Lubricate:
• Adjusting pad "1"
• Valve lifter "2"
7. Install:
• Adjusting pad
• Valve lifter
TIP
• Check that the valve lifter turns smoothly when
rotated with your finger.
• Make sure that the valve lifter and the adjusting
pad are reinstalled in their original positions.
5-30
2
E
1