What cc dirt bike should i get?

I am 125 pounds and about 5'9.

I am 15, 125 pounds and about 5'9. I have a bit of experience rideing my friends yz 125 but that was obviously to big for me.

It sounds like your first bike, Id get a 125 just to rag about abit and get the feel, then move up to a 250 when your ready for something abit heavier and faster!

Perhaps state how old you are as well and what use you are going to put the bike to and how much experience you have riding as it is hard to answer properly without all the information.
I just noticed that you are only a level one so wont be able to add to this question I don't think. So will state either repost the question or go along to a local dealer and tell them what you need and they can advise you.
Well obviously you can edit!
So while you are very light I would not think that with your height a crf250f would be too big but if you think it is then you could look at a 2 stroke 125cc as they would be a bit lighter to throw around. I think anything smaller than a 250cc or a 125cc you would be too tall for. YOu could also go along to a dealer and sit on a crf150f but I think you are just too tall.

ur best bet is a 125 2 stroke or a 250 four stroke dont get a 85 ur way to big for it i know this because becuz im 13 and im 5,8 and i moved up 2 a 250 four stroke from a 85, and it fits me perfect,go for a 250 four stroke if ur a big lad there quiet heavy lol gud luck

2-stroke 85cc extremely light and easy to maneuver with decent power for a small bike.

yz125 is not too big for 5'9!!!!!!!!!

that is the exact bike i would reccommend

Buy what you want.

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get a 125 four stroke not that much slower but a little smaller.