Well, Well, Now you're in my area. A few years ago I built a bike that ws reinforced with not only king pins, and 1/4 inch steel, and I did it withe GX160 with a Stage 3 kit.
Being 72 now I can't remember quite what went into it, all I know it was expensive.
It GPS'd out at about 59mph.
Front and rear worksman drum brakes, I also had another front brake, 3 altogether.
Check out Affordable Go Karts.
I don't drive it much, it is very illegal here in Maine.
Good Luck!
