Yamaha BIG BEAR PROFESSIONAL 400 YFM400FPT Owner's Manual page 230

WARNING
_
Always follow proper procedures for going
down hills as described in this Owner's Manu-
al.
Note: a special technique is required when
braking as you go down a hill.
G
Always check the terrain carefully before
you start down any hill.
G
Shift your weight backward.
G Never go down a hill at high speed.
G Avoid going down a hill at an angle that
would cause the vehicle to lean sharply to
one side.
Go straight down the hill where possible.
_
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