Suzuki GSX1300BK Owner's Manual page 71

To change the spring pre-load, turn the
adjuster 1 clockwise or counterclockwise.
Turning the adjuster clockwise will increase
the spring pre-load. Turning the adjuster
counterclockwise will decrease the spring
pre-load. There are 5 grooved lines on the
side of the adjuster 1 for reference. Position
5 provides the minimum spring pre-load and
position 0 provides the maximum pre-load.
This motorcycle is delivered from the factory
with its adjuster set on position 4.
A Position 0
B Position 4
C Position 5
2-53
0
0
1 2
3 4
0
1 2
3 4
5