1986-1991 Kawasaki 650 X-2 Service Manual, Page 96Get this manual
108 PUMP AND IMPELLER oMeasure the impeller outside diameterIf the impeller is worn smaller than the service limit, replace itImpeller Outside Diameter Standard: Service Limit: 139.5 -139.6 mm 138.5 mm
Impeller Clearance -Impeller ,clearance is critical to proper performanceIf the pump case and impeller are not visibly damaged, poor performance may be caused by too much impeller clearance eTa check impeller c'iearance, remove the grate and insert feeler gauge between the tip of the impeller blade and the pump case