September 2002 was the model change.
As has been said there was a change from a single to a twin spark. So the engine was modified to take two plugs per cylinder.
This also required a new Engine control unit.
Additionally the complete brake system was replaced. The anti lock brake system was changed to an integrated braking system with linked brakes. A feature and system which would later appear on the R1200GS. Therefore the brake calipers, discs and even the wheels were changed.
Even if you have a factory Non IABS you will still have the wheels, discs and calipers.
There was the addition of a jump start system. Basically a positive and negative stud easily accessible which connect directly to the Battery.
There were also some minor wiring changes. Different plugs and modules and switches.
Daylight running lights were added, basically bypassing the switch of the earlier model. The lights then required protection with the addition of a fuse.
Indicators changed to clear covers and yellow bulbs.
Unfortunately they didn't update the handbook to tell you all of this.
I think I got it all
