2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 71Get this manual
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FUEL SYSTEM (DFI) 3-23 Self-Diagnosis Service Code (Character) Table
31 41 42 43 44 51 52 71
72 (JT1500-A1) 73 (JT1500-A2(JT1500-A2 )
The ECU locks ignition timing into