Kawasaki STX-15F - Manual (Page 80)

3-26 FUEL SYSTEM (DFI)
Troubleshooting the DFI System
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spark plug loose (tighten it).
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spark plug dirty, broken, or gap maladjusted (remedy it).
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spark plug incorrect (replace it).
Poor running
or no power at
high speed
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knocking (fuel poor quality or incorrect).
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engine overheating.
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engine oil level too high.
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engine oil viscosity too high.
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other: