2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 35Get this manual
PERIODIC MAINTENANCE 2-15 Periodic Maintenance Procedure Pump and Impeller
Impeller Inspection
Examine the impeller [A]If there is pitting, deep scratches, nicks or other damage,
replace the impeller
Minor nicks and gouges in the impeller blades can be removed with abrasive paper or careful filingSmooth leading edges are especially important to avoid cavitation
Steering