27-10-12, 09:29 PM
Big backfire suggests its fuelling properly but not igniting... points to an electrical problem.
That would suggest that there's some vital wire somewhere that is making intermittent contact. That's not unusual on a 10yr old bike.
Some possibles...
+12V or earth to the coils.
The timing lead from the pickup in the engine left casing.
Corrosion in the ignition switch.
The immobiliser plug (or frayed wires to it) under the seat failing to make contact (that was the cause of the same problem for some bloke on here recently)
etc. etc.
Need more evidence: I would get it idling and start waggling some wires to see if you can make it die.
That would suggest that there's some vital wire somewhere that is making intermittent contact. That's not unusual on a 10yr old bike.
Some possibles...
+12V or earth to the coils.
The timing lead from the pickup in the engine left casing.
Corrosion in the ignition switch.
The immobiliser plug (or frayed wires to it) under the seat failing to make contact (that was the cause of the same problem for some bloke on here recently)
etc. etc.
Need more evidence: I would get it idling and start waggling some wires to see if you can make it die.