The Burgman 400 is no harder to work on than than a Kymco xciting 500.
Both are the same basic design, twist and go, the Burgman just has more body panels to remove.
Once you move up to the Burgman 650, that one is a whole other can of worms.
Electrically controlled 6 speed transmission, auto mode, manual paddle shifter mode, power mode.
Ride Safe,
Doc