Yamaha KODIAK ULTRAMATIC YFM400FA Owner's Manual page 220

Improper riding procedures such as abrupt
throttle changes, excessive braking, incorrect
body movements, or too much speed for the
sharpness of the turn may cause the ATV to tip.
If the ATV begins to tip over to the outside
while negotiating a turn, lean more to the in-
side. It may also be necessary to gradually let
off on the throttle and steer to the outside of
the turn to avoid tipping over.
Remember: Avoid higher speeds until you are
thoroughly familiar with the operation of your
ATV.
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