Polaris Outlaw 450 MXR Owner's Manual page 86

Operation
Driving in Reverse
7. Do not operate at full throttle. Use just enough throttle to maintain a desired speed.
8. Always look left, right and behind the ATV before backing.
NOTICE: Excessive throttle operation while in the speed limit mode may cause fuel to build in the
exhaust, resulting in engine popping and/or engine damage.
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