1996-2002 Kawasaki 1100ZXi Jet Ski Factory Service Manual., Page 190Get this manual
16-6 SUPPLEMENT 1997- 1999 MODELS Technical Information
5) When then engine is idling, the throttle valve [3] is almost closedThe low pressure in the intake tract downstream of the throttle valve draws fuel through the pilot outletand the bypass outlets [I51 from the regulator chamber [12]I1 Even though the pressure in the ventun [2] is higher on the upstream side of the throttle valve, almost no fuel flows through the needle jet [20] and into the regulator chamber [12], because of the check valve [fa]-