Apparently you are too lazy to find answers yourself. If you would have just clicked "Divisions" then "Jr. Outlaw" on the provided link, you'd find not only the weight requirements, but even what types of steel to use for the frame/cage.
"Combine a 5 point seat belt, a welded on full perimeter roll cage, sprint car styling, a clearance and sealed box stock raptor III motor built specifically for a children's division 11 to 14 years of age and an adult class of 14 and over - you have a Wild Thing Kart Outlaw
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This kart was all new for 1999 and is built to fill the need for an inexpensive way for parents and their kids to have fun. The Outlaw is built from a blend of mild steels. 1-1/8" diameter tube makes up the roll cage construction and is welded to a 1-1/8 diameter chrome moly chassis. This chassis incorporates a unique flex design for front and rear of the kart. This lets you control the amount of flexibility in your kart. It also has an adjustable seat, adjustable steering post, spindles with bearings, slotted motor plate, fixed 6 degree spindles, double bar nerf bars, sprint style rear bumper, fiberglass tail and an aluminum body."
if everyone was like anderkart and not like redsox we would have a perfect world. thats for being a 
redsox.
