Dave I have bought my son this for xmas
https://passionford.com/forum/restorations-rebuilds-and-projects/262356-my-sons-go-kart-project.html
he will be 8 just before xmas, cadet karts are for 8to12 year olds, and there a many types, if he wants to go racing at warden L he needs a sealed comer W60 engine cadets can also race with honda engines not sure if W L do this tho.

steve