Yamaha EF5500EFW Owner's Manual page 48

Poor spark
2 Spark plug dirty with carbon or wet .... Remove
carbon or wipe spark plug dry.
2 Faulty ignition system .... Consult a Yamaha deal-
er.
791-001d
Generator won't produce power
2 Safety device (AC switch) to "3" (OFF) .... Turn
the AC switch (N.F.B.) to "I" (ON).
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