re: Dirt bike for tall teenage boy who's never ridden, but is fearless?

Listen to Yammie 250F. He knows what he's talking about. I rode enduros before I was fat and a dad. Now I've got my 5 yo starting out on a PW50- that he's been riding since 4 and a half.

If I was you, I'd look for a clapped out 125 2 stroke. Maintenance is high on a modern 4 stroke....and not everyone is skilled enough to do it right. Note, I didn't say do it, many claim they know, but aren't very good at it. Your high school son will be able to take care of his mishaps and do his own top end jobs on a 2 stroke and it'll only cost about 50 bucks for the piston kit.