1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 78Get this manual
MODELS leak in the intake manifold; uneven compression between the cylinders; and sticky or broken reedsOf course any problem in the carburetor affecting the airfuel mixture will also prevent the engine from operating smoothly at idle speedThese problems usually include: weak float arm return spring; leaking needle valve and seat; defective choke; and improper adjustments for idle mixture or idle speed
Excessive Fuel Consumption
Excessive fuel consumption can be the result of any one of two conditions, or both may apply1- Inefficient engine operation2- Poor boating habits of the opera torIf the fuel consumption suddenly increases over what could be considered normal, then the cause can probably be attributed to the engine or watercraft and not the operatorfuel system for possible leaksA leak between the tank and the pump many times will not appear when the engine is operating, because the suction created by the pump drawing fuel will not allow the fuel to leakOnce the engine is turned off and the suction no longer exists, fuel may begin leakIf minor tune-up has been performed and the condition still exists, then the problem most likely is in the carburetor and an overhaul is in order