2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 127Get this manual
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11-4 PUMP AND IMPELLER Specifications
Item Standard Service Limit 146.5 mm (5.77 in 149.1 mm (5.87 in 0.6 mm (0.024 in Jet Pump Impeller Outside Diameter 147.5 147.7 mm (5.807 5.815 in Pump Case