Yamaha YFM40FBB Owner's Manual page 73

If you are climbing a hill and you find that you have
not properly judged your ability to make it to the
top, you should turn the ATV around while you still
have forward motion (provided you have the room
to do so) and go down the hill.
If your ATV has stalled or stopped and you believe
you can continue up the hill, restart carefully to
make sure you do not lift the front wheels which
could cause you to lose control. If you are unable
to continue up the hill, dismount the ATV on the up-
hill side. Physically turn the ATV around and then
descend the hill.
If you start to roll backwards, DO NOT apply either
brake abruptly. If you are in "2WD", apply only the
front brake. When fully stopped, apply the rear
brake as well, and then lock the parking brake. If
you are in "4WD" or 4WD-LOCK, because all
wheels are interconnected by the drive train, ap-
plying either brake will brake all wheels, therefore,
avoid sudden application of either the front or rear
brake as the wheels on the uphill side could come
off the ground. The ATV could easily tip over back-
wards. Apply both the front and rear brakes gradu-
ally. When fully stopped, lock the parking brake
and dismount the ATV immediately on the uphill
side, or to a side if pointed straight uphill. Turn the
ATV around and remount, following the procedure
described in the Owner's Manual. WARNING!
Stalling, rolling backwards or improperly dis-
mounting while climbing a hill could result in
ATV overturning. If you cannot control the
ATV, dismount immediately on the uphill side.
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