Honda HSM1336i Owner's Manual page 24

CONTROLS & FEATURES
POWER mode:
Travel speed is automatically reduced so that the engine speed and
snow discharge distance are held at the given speed and distance that
have been set with the throttle control lever.
Setting the throttle control lever in the second range from the bottom
clears snow the fastest (maximum snow-clearing efficiency), but the
snow discharge distance is shorter. Set the throttle control lever in
most appropriate engine speed and snow discharge distance for the
work.
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POWER mode
Long
Slow
THROTTLE CONTROL LEVER
4th (Long)
3rd
2nd
1st (Short)
Short
Fast