It mostly likely that the cap internals are corroded or the carbon resistor in the cap has gone higher resistance.
Out of curiosity and if you have time, remove the old caps and looking into to them, you will see a slot for a screwdriver. Unscrew it and out will fall, the piece you unscrewed, a carbon resistor, a tiny brass washer and a spring. A very high possibility that there is corrosion in there somewhere and if not the resistor is knackered. :eek
I have swapped the resistors with the 5Kohm resistors ones from old NGK spark plugs, (these are wire wound and more reliable) cleaned up the corrosion on the spring and the internal part of the cap, dumped the tiny washer (they break half the time). Requires a bit more pressure to reinstall as the NGK resistor is a little longer than the carbon one. Put them all back together and works fine. :thumbup
Have not heard of a fazer coil pack up yet.
Out of curiosity and if you have time, remove the old caps and looking into to them, you will see a slot for a screwdriver. Unscrew it and out will fall, the piece you unscrewed, a carbon resistor, a tiny brass washer and a spring. A very high possibility that there is corrosion in there somewhere and if not the resistor is knackered. :eek
I have swapped the resistors with the 5Kohm resistors ones from old NGK spark plugs, (these are wire wound and more reliable) cleaned up the corrosion on the spring and the internal part of the cap, dumped the tiny washer (they break half the time). Requires a bit more pressure to reinstall as the NGK resistor is a little longer than the carbon one. Put them all back together and works fine. :thumbup
Have not heard of a fazer coil pack up yet.