Yamaha TT-R50E, Owner'S Service Manual

Page: 230 / 390

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ENG
VALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
1. Apply:
• Molybdenum disulfide oil
(onto the valve stem and valve stem seal)
2. Install:
• Valve stem seats
• Valves
• Valve springs
• Valve spring retainers
NOTE:
Install the valve springs with the larger pitch
a
facing upwards.
b
Smaller pitch
New
3. Install:
• Valve cotters
NOTE:
While compressing the valve spring with a
valve spring compressor and attachment
1
install the valve cotters.
Valve spring compressor:
YM-04019/90890-04019
Valve spring compressor attach-
ment:
YM-04108/90890-04108
4. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a piece of
wood.
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.