Yamaha BIG BEAR PROFESSIONAL 400 YFM400FPT Owner's Manual page 226

WARNING
_
Use proper gear and maintain steady speed
when climbing a hill. If you lose all forward
speed:
G
Keep weight uphill.
G
Apply the brakes.
G Lock the parking brake after you are
stopped.
If you begin rolling backwards:
G Keep weight uphill.
G
Never apply the rear brake while rolling
backwards. Apply the front brake.
When fully stopped, apply the rear brake
as well, and then lock the parking brake.
Dismount on uphill side or to a side if pointed
straight uphill. Turn the ATV around and re-
mount, following the procedure described in
the Owner's Manual.
_
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