Polaris 2003 MSX - Manual (Page 71)

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OPERATION
Post Operation Maintenance
Daily Care
10. Stop the engine and disable all starting
mechanisms. Clean the jet pump and impeller of
any weeds and debris that may have collected
during operation.
11. Inspect the area for damage. If damage is found,
see your Polaris dealer for service.
NOTE: Whenever possible, avoid operating the
watercraft in weedy areas. If it’s unavoidable, vary the
watercraft speed, as weeds tend to accumulate more
rapidly at steady and trolling speeds.
WARNING
Serious injury and damage to the watercraft will
result if the jet pump and impeller are cleaned while
the engine is running. Always stop the engine,
remove the lanyard lock plate and disconnect the
battery before servicing the jet pump and impeller.