Gene, I use to have a Tony Kart Mitox with a Vortex engine. I know what you mean about the brakes and the kart was a ***** to setup. Thats why I went to a CRG rebel. The Vortex motor is a pretty good ICC, but hard to tune, you need have the jetting perfect. As for tuning, my mechanic is located at Willow Springs. If you want more details, please pm me. Regards, Vick