Honda HSM1380i Owner's Manual page 26

Throttle control lever
Use the throttle control lever to adjust the engine speed and/or snow
discharge distance (HSM1380i)./with the mode selector switch set at
the POWER or SELF position (HSM1390i).
Note that the engine speed and snow discharge distance cannot be
adjusted by operating the lever when the AUTO mode (HSM1390i) is
selected.
[HSM1380i]
ICS SWITCH
[HSM1390i]
Moving the throttle control lever to the FAST side increases both the
engine speed and snow discharge distance.
Moving the throttle control lever to the SLOW side decreases both the
engine speed and snow discharge distance.
24
··· ON
FAST ···
··· OFF
SLOW ···
THROTTLE CONTROL LEVER
SELF
···
FAST
···
SLOW
THROTTLE CONTROL LEVER
OFF ON
POWER
··· 4th (Long)
··· 3rd
··· 2nd
··· 1st (Short)
··· 4th (Long)
··· 3rd
··· 2nd
··· 1st (Short)