Yamaha XT660R S Service Manual page 270

VALVES AND VALVE SPRINGS
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EAS00245
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)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• valve 1
• valve spring seat 2
• valve stem seal 3
• valve spring 4
• valve spring retainer 5
(into the cylinder head)
NOTE:
_
• Install the valve spring with the larger pitch
a facing up.
• Install the valve spring with its painted end
facing up.
b Smaller pitch
ENG