Ive done a fair bit of karting before, nothing serious but ive been to a lot of places. and i must say that the lawnmower ones are crap
The only real kart to drive is a 'prokart' you will litterally shit your pants when you drive one as the acceleration anchors you back in the seat and unlike the lawnmower kart you cannot take a bend at full speed!,if you do attempt this you are likey to end up in the gravel or upsidedown as i found out in Cyprus (near Larnaca airport) when me and my mate went on the prokarts there