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

Kelly Blue Book is your friend....

$1280 for excellent condition at dealer retail.

$805 good condition trade in.

I would take the average and work to that.

Also, seat height on a 150F is 33", so probably won't be too short to feel small for a 6 footer. If anything, maybe it will make him feel very much in command of the bike.

I'm 6 foot, and my bike seat height is 36", and it might be a little tall, but that's how it is, and they lower a lot once you sit on them.