07-07-12, 01:14 AM
My guess is an ignition circuit fault on the HT side. If you can replicate the fault for testing purposes, you can try (carefully!) touching the downpipes (the missing cylinder will be cooler).
Not familiar with the ignition set up on the FZS bikes, if there's four coils (one per cylinder) check the connections (inc the low tension {LT} wires to that coil, if its a 2-coil system, one of your HT leads is probably damp and leaking to earth instead of going to your spark plug.
Also worth checking the state of your spark plugs for tell-tale signs of the state of your motor.
Not familiar with the ignition set up on the FZS bikes, if there's four coils (one per cylinder) check the connections (inc the low tension {LT} wires to that coil, if its a 2-coil system, one of your HT leads is probably damp and leaking to earth instead of going to your spark plug.
Also worth checking the state of your spark plugs for tell-tale signs of the state of your motor.