Voltage Drop on Starting

[Fazerider]

...  I checked the voltage and it was 12.5 after one attempt at starting which then dropped down to about 7.9 on the second try!!
As mentioned, the battery has been on-load drop-tested by Vernon's in Portsmouth who confirmed it was ok.

The battery ought to survive at least 30 seconds of cranking the engine over before it sinks that low. Either it's not getting charged or is duff or, as you suggest, the starter is drawing more current than it should. Seems like an odd fault, but hopefully it's as easy a task to swap as it is on the original Fazer. Though... if you need to take the rad off the FZ6 to change the plugs, replacing the starter is probably an engine-out job. :lol