If your kid is a motorbike enthusiast, then you will probably want to get him/her a safe and powerful bike. With so many models in the industry to choose from, you may end up getting the wrong bike.
Mini bike building is a growing community. Just take a look at the Redditor who made a mini bike using just Harbor Freight tools. Thene there's the Mega Moto 212, which has been an industry mainstay.
Coleman mini bikes aren't meant for use on public roads but they are a fun way to cruise private property or off-road areas. These other models can do the same.