Honda SH150i 2010 Owner's Manual page 124

The spring pre-load adjuster ( ) has
positions for different load or riding
3
conditions.
Use a handlebar ( ) to adjust the rear 2
shock spring pre-load.
Position 1: standard position.
Positions 2 to 3: for when the scooter is
more heavily loaded. (Also increase spring
pre-load for stiffer rear suspension.)
Make sure that both shock absorbers ( )
are adjusted to the same position.
1
3
Always adjust the shock absorber position
in sequence (1-2-3 or 3-2-1). Attempting
to adjust directly from 1 to 3 or 3 to 1 may
damage the shock absorber.
Servicing Your Honda
Suspension
117