Yamaha XP500 2001 Service Manual page 230

VALVES AND VALVE SPRINGS
6. Lubricate:
S valve pad
(with the recommended lubricant)
7. Install:
S valve pad
S valve lifter
CAUTION:
After making sure that the valve pads are ful-
ly inserted, install the valve lifter taking care
so that the pads do not fall.
NOTE:
S The valve lifter must move smoothly when ro-
tated with a finger.
S Each valve lifter and valve pad must be rein-
stalled in its original position.
5-27
ENG
Recommended lubricant
Molybdenum disulfide oil