Out of condado and turn right at roundabout towards Murcia.
At next roundabout go all the way around as though you are coming back to condado but as you turn back onto condado direction there is a service road, 4th exit, turn right onto this away from roundabout towards Alhama direction for about half a mile till you come to 1st buildings, turn left before the building and go for another half mile and its on your right.
There is a sign on the roundabout saying Karting.
Enjoy its good fun, they only speak spanish but there is a price list in English inside the bar, just point and try a bit of spanish you will be fine LOL