Yamaha VK540EG Owner's Manual page 57

Extension Spring Preload
Adjust the spring preload by turning the adjuster 1.
Adjuster
Preload
Snow condition
820-049
2 Standard length
CAUTION :
Be sure the left and right spring preload is same.
Turn in
Harder
Icy
16 mm (0.63 in)
8-16
Turn out
Softer
Soft