Ski-Doo REV series 2007 Operator's Manual page 124

A33A30A
PULL 2+1 SEAT REARWARD
NOTE: When the "2+1" seat is removed, you must always proceed
to the reinstallation of the passenger's seat (the one with a backrest)
immediately behind the operator's seat before riding. Failure to do
so leaves the snowmobile with a hole between the operator's seat
and the passenger's seat. This is incorrect and the snowmobile must
not be ridden in this configuration.
– NEVER use the hole left by removing the "2+1" seat to sit a
passenger or put cargo. The passenger could hurt his back
or suffer other serious injuries due to his seating position.
Cargo placed in this hole would be unstable, could fall and
potentially injure someone.
– A passenger sitting on the passenger's seat that is installed
in the "third" position must not use the hole left by the
"2+1" seat to put his feet as it could impair his stability.
Feet must remain on the footrests and hands must firmly
grasp the grab handles at all times.
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WARNING