Polaris Dragon Owner's Manual page 48

THE PERFECT FIT
IQ Rear Suspension Adjustments
Torsion Spring Preload
To adjust rear torsion spring preload, rotate the three-position cam using
the engine spark plug tool. Adjustment is easiest when the cam is
rotated from low to medium, and then to high. Rotating directly from
low to high will require significantly more effort.
Different rate torsion springs are available if a firmer ride is desired. See
your dealer for more information.
Soft Medium Firm
45