Yamaha RST90L Owner's Manual page 74

ESU03042
Adjusting the ski spring preload
The spring preload can be adjusted by turning the spring
preload adjuster 1.
CD-10E
Spring adjuster position
Preload
Standard
CAUTION :
@
The left and right ski spring preload must be set to
the same setting. Uneven settings can cause poor
handling and loss of stability.
@
8-20
5 4 3
2 Hard
1
2 1
Soft 3