for sure thet are great fun.......but if given the chance try and get a drive of a clubman kart...they only have 15hp or so but the 4 strokes only have about 5hp.
i raced clubman for a number of years,including on a street circuit,where i was clocked by police radar at 156kph.an inch off the ground...sounds fast ...but the higher powered karts were the twin supers.....using 2 x 100cc read valve motors,putting out about 35hp on methanol and revving to 26,000 rpm....yeeeeaaahhhh baby.they were topping out at 210kph...no gears or clutch...direct drive.funny thing was in all classes they used a 380zx as a pace car....cept for the supers who kicked him out the way because he was going to slow for the roll around.