2003 Kawasaki 1100 STX D.I. Jet Ski Factory Service Manual, Page 23Get this manual
1-16 GENERAL INFORMATION Technical InformationTheory of Direct Fuel Injection 6Electrical system component
61 Flywheel EMM uses ribs on the outer circumference of the flywheel to time injectorsThe ribs are unevenly spaced, and the EMM determines crankshaft position and engine rpm by the rib spacing
The flywheel houses magnets that work in conjunction with the stator to provide battery charging (12 volts) and injector operation (45 volts)Within approximately one crankshaft revolution, the EMM will learn crankshaft positioning to enable it to fire the cylinders and control spark advance62 Stator The stator, in conjunction with the flywheel and rectifierregulator, makes up the DFI system alternatorThe stator consists of 12 poles with sets of windings that are all connected to the EMM (10 wires)Switches are located in the EMM switching circuit(1) The ignition system receives its operating voltage from the stator (45 V), not the battery(2) During engine starting, switch closes and connect all windings in seriesThis maximises the available power for the EMM and injectors(3) The battery operates the starter, fuel pump, and instrumentation during starting(4) At approximately 500 rmin (rpm), the switch opens isolating the battery charging windings from the EMM and injector windingsThis is normal operationTo satisfy power requirements at higher rpms, the stator switches windings from series to parallel at 2500 rmin (rpm)63 Capacitor The capacitor is dampening device that prevents erratic operations of the injectionsA faulty capacitor will cause the engine to surge or sharply miss