2003-2005 Kawasaki JetSki Ultra-150 Factory Service Manual, Page 36Get this manual
PERIODIC MAINTENANCE 2-7 Periodic Maintenance Procedure Fuel System
Idle Speed Adjustment
The normal idle speed is the lowest stable speedTurn the idle adjusting screw [A] as required to reach this settingIdle Speed 250 100 rpm (in water) 800 100 rpm (out of water)