Small dirt bike quad bike (St leonards)

Hello just start with, this is a generic image from Google i don't own this bike.

Currently looking for a off road bikes quad go-kart or mini moto 50cc twist and go. Looking for my niece and nephew. 8 and 12 (lanky 12yr old)

First time bikers

No electric ones
We have private land use

Will consider bigger bikes than 50cc
Can collect will travel 30 miles for the right bike for them.

Quad bike pitbike mini moto trials go-kart dirt bike field bike non runner project spares or repair anything considered honestly not picky I can make anything run and anything safe for them to ride.
Can you help with this request?
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