...will be a throttle position sensor that feeds info to the ignition system, make sure it's connected properly (unless they are not the original carbs and your bike never had a TPS). Also you should undo the throttle cables and choke cable to see if that cures the problem. Put them back on, one at a time and make sure that they all have a couple of mm free play in them, adjust as necessary.
Try re-routing the cables behind the r/h fork leg and see if it stops getting pulled tight when you turn the bars to the left.
Cheers, Big Mick.