Go Kart Masters Academy- now Victory Powersports. Sometimes buying a go kart online can be quite difficult. It can hard to figure out which kart will fir your kids. We're going to put our own kids in a few karts to give you an idea of what you need.  For parts and maintenance kits, check out This Mini XRX go kart is the same size frame as any of our mini karts. At 43" tall our 4 year old fits just right in a mini go kart. With the seat forward, he can easily reach the steering wheel and pedals. he still has plenty of growing room by adjusting the seat.