1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 91Get this manual
FUEL AND OIL
CAUTION
Mixture Screws with Limiter Caps Since about 1989, the manufacturer has installed small black plastic limiter which snap over both the low speed and high speed adjustment screwsThe purpose of these caps is to prevent any unauthorized tampering with the factory settin Each carburetor is individually adjusted at the factory using flow meterA the adjustment is completed, limiter is installed over the head of the screw prevent accidental tamperingEach cap has and the tab fits into slot in the carburetor body at the base of the mixture screwTherefore, the optimum position of each screw is with the down and indexed into the slotHowever, if the mixture screws removed during service procedures, the low and high speed mixtures must be adjusted and both caps installed over the screws with the tabs on the caps indexed into slots in the carburetor body