Yamaha RS90K Manuel D'atelier page 490

VALVES AND VALVE SPRINGS
6. Lubricate:
• Valve pad
• Valve lifter
(with the recommended lubricant)
7. Install:
• Valve pad
• Valve lifter
NOTE:
• The valve lifter must move smoothly when rotated
with a finger.
• Each valve lifter and valve pad must be rein-
stalled in its original position.
5-36
ENG
Recommended lubricant:
Molybdenum disulfide oil