I'm not a first time kart driver. I've been doing it for years. Unfortunatelly, he karts they offer for rent in my country (Bulgaria) are 1 stroke. There are some official races where they have some pretty mean karts, but I don't think I will get my hands on one. Oh and yes to drive a shifter kart must be quite a challenge especially at first.
About the top speed/acceleration thing, I know it's not the most important thing, who cares about some numbers when with some 5 or 6 hp you can go pretty fast especially on corners.
But I was just curious guys come on!!!
p.s. Ronin,. I'm almost sure they will hit 40mph, even the 5.5hp one.