There are a few known faults, 4 coils which are known to fail will make the FI light stay on but will run fine ubnless 2 fail on the same cylinder. Fix replace with ones from a reanult (I think).
Under the tank there is a big plastic connector which connects the generator wires to the loom, this can corrode and melt so no charge. Fix cut it off and solder wires together.
Those are the 2 main ones that come up on the forums.