Yamaha BIG BEAR PROFESSIONAL 400 YFM400FPT Owner's Manual page 186

WARNING
_
Always use the size and type tires specified in
the Owner's Manual for this vehicle on page
5-19. Always maintain proper tire pressure as
described in the Owner's Manual on pages
5-21–5-23. Use of improper tires on this ATV,
or operation of this ATV with improper or un-
even tire pressure, may cause loss of control,
increasing your risk of an accident.
_
Do not operate at speeds too fast for your
skills or the conditions.
WARNING
_
Always go at a speed that is proper for the ter-
rain, visibility and operating conditions, and
your experience. Operating this ATV at speeds
too fast for your skills or the conditions in-
creases your chances of losing control of the
ATV, which can result in an accident.
_
7-15