14-04-19, 10:45 PM
Lots of faults can cause a loss of sparks, but quite a lot of them will also prevent the starter motor from running.
If you have a multimeter that can help to pin things down.
Without one, I’d check connectors are clean and tight everywhere and pay particular attention to the wiring at the rear of the bike near the ignitor unit. If there is, or has been in the past, an alarm fitted then the wiring may have been bodged in that area. On Fazers that haven’t been altered there are a couple of link plugs where the factory immobiliser option can be fitted. If the plugs are corroded or if one of the black wires to them is broken then that will allow the starter to operate, but you’ll get no sparks.