02 Dakar Surging and Stalling

[Koorsblaar]

The bike gives a 'sluk' every now and then and sometimes the rev-counter goes bananas, sometimes it gets very bad , coughs,splutters and dies, wait for a minute and it goes again. Read on some forums it could be surging.
Where do I start to try and fix this.

 

[michnus]

 

[Chrisl]

 

[Jughead]