Yamaha GRIZZLY ULTRAMATIC YFM660FP Owner's Manual page 168

4. Check behind for people or obstacles, then
release the rear brake pedal.
5. Open the throttle lever gradually and contin-
ue to watch to the rear while backing.
WARNING
Improper operation in reverse could make you
hit an obstacle or person behind you, resulting
in serious injury. When you shift into reverse,
make sure there are no obstacles or people be-
hind you. When it is safe to proceed, go slowly.
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