Polaris 2011 ATV Sportsman Forest 550 - Manual (Page 71)

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MAINTENANCE
Periodic Maintenance Chart
Improperly performing the procedures marked with a
 could result in
component failure and cause an accident, which may result in serious injury or
death. Always have an authorized POLARIS dealer perform these services.
Maintenance Chart Key
 Perform these operations more often for vehicles subjected to severe
use.
E Emission-related service (Failure to conduct this maintenance will
not void the emissions warranty but may affect emissions.)
 Have an authorized POLARIS dealer perform these services.