1995-1997 Kawasaki 750ZXi-900ZXi Jet Ski Repair Manual., Page 132Get this manual
10-10 PUMP and IMPELLER
Impeller Clearance
Impelle clearance is critical to proper performance If the pump case and impeller are not visibly damaged, poor performance may be caused by too much impeller clearanceT check impeller clearance, remove the grate and insert feeler gauge [A] between the tip of the impeller blade [B] and the pump case