2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 71Get this manual

2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 71

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FUEL SYSTEM (DFI) 3-23 Troubleshooting the DFI System

spark plug loose (tighten it)spark plug dirty, broken, or gap maladjusted (remedy it)spark plug incorrect (replace it)knocking (fuel