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Mine brother in law, his step-sis kid got a quad. But after some influencing, the kid wants a two wheel bike. He used his quad to ride at the grass field when his mom is riding and training her horses. And that is why he is gonna use the new bike for too. But I try to get him to the other side, to make him get to known the sport.
But first of all the parents want to give him a cheap bike to try it out. I was looking for 65cc KTM bikes, but they are way to pricey. I mean a average price from 1600 euro (1800 US dollar) for a second hand bike is a bit too much for his parents. Because "what if he doesn't like it". So I tried to convince him to buy a KX65, they are pretty cheap, I'm talking about 1000 euro (1175 dollar). But still a bit to high for them...
So now I introduced them to the Chinese knock off bikes. Because if they wanna have something cheap they get something cheap. I saw some interesting models and will show them very soon. The prices are going between 450-600 euro (528-704 dollar) and the bikes looks more then suitable for learning a almost 7 year old riding a grassfield.
Storm Dirtbike - 70cc
Bullbike - 50cc
Gazelle - 50cc