I undone 2 screws under the throttle cable housing, took it apart and removed both throttle cables. I marked top and bottom cable and made a note how the cables fitted. One goes over the top of the bar, one under. It was a little difficult to re attatch the. At first after cleaning the elbows but a slacked off the cables using the adjuster and it was easier.
Take extra care when screwing up the throttle housing, as over tightening can thread the housing ruining it and it will contantly spin on the bars. One of my friends did that and had to buy a new housing off ebay second hand