Hi, I have had the same issue with my kart for a while, but I’ve found ways that help slightly. I have a Yerf 32001, single seat. The issue is that there’s more weight at the back of the kart, most likely just how it was designed. (Pictures will help here)
First think that will help is adjusting the toe, meaning instead of the wheels pointing straight, they should point different directions when they steering is centered.
Sorry but this might help: when wheel is straight the left wheel would be pointed slightly out to he left and the right would be pointed slightly to the right. Somewhat like this \ /
Now that small image is more angle than you would use, but I hope it gives the idea.
Second if that doesn’t work I would say new tires. I use simple Carlisle turf tires, but pretty much any tire with a decent treat should help.
Third is terrain. And with this you have to change your driving style. Such as swing the back end out when turning and get a small drift in. Lean into your turn, use body weight to your advantage.
Now some guys on here might say shift the engine forward, or the seat, but that’s not always possible, as in my situation. So I use these three things and it’s greatly improved handling
*edit* if any of this is confusing let me know and I will try to better explain