Honda Pioneer SXS700M2P 2019 Owner's Manual page 175

Suspension
Rear Suspension Spring Pre-Load
Refer to Safety Precautions on page 105.
REAR
spring pre-load adjuster
1 2 3 4
5
The spring pre-load adjuster has 5 positions for different load or
driving conditions. Before adjusting the spring pre-load, jack up your
Honda SXS (page 123) to avoid damaging the adjusters.
Use the pin spanner to adjust the shock spring pre-load.
Pin spanner part number: 07702-0020001
Available through your dealer.
Position 1: for a light load and smooth terrain.
Position 2: standard position.
Positions 3 to 5: for when the SXS is more heavily loaded. (Also
increase spring pre-load for stiffer suspension.)
Make sure that both shock absorbers are adjusted to the same
position.
Always adjust the shock absorber position in sequence (1-2-3-4-5 or
5-4-3-2-1). Attempting to adjust directly from 1 to 5 or 5 to 1 may
damage the shock absorber.
Servicing Your Honda 165