I do have OTK Tony Karts, been using them on the Yamaha class, LO206 class as well.
We do love them, they are super easy to tune, very fast out of the box, you can actually win races just by setting them up neutral.
Compared to your old Emik Tony karts are so much easier to drive, with a lot less effort to steer.
I do have 2 available older chassis if interested, they are extremely competitive still, my Son is not racing any more, and we don’t need 7 karts laying around the shop collecting dust. I have to get rid of all of our LO206 karts, and Yamaha karts.