I'm thinking of starting to ride dirt bikes do you think a Honda 250 will be to powerful I'm 5ft11 68kg and 15 years old?

I'm thinking of starting to ride dirt bikes do you think a Honda 250 will be to powerful I'm 5ft11 68kg and 15 years old?

You can handle it.

What Honda 250? A CR 250 or a CRF 250?
The CR 250 is a two-stroke used mostly for MX racing. The CRF 250 is a four-stroke than can do both track and trail but lacks a little on the track and be a good trail-bike.

No, not too powerful.

You'll easily grow into it
and be wiser after rides.
Then you're ready for a
400. Get 'r done.

Possibly but you will be accostomed to the power and as you get older and stronger, you will get used to the bike
have fun and make sure that you wear all of the safety gear as the fun stops when the pain starts

Query: How can your height be in inches, yet Mass in Kilograms?

A crf250r is a quick racing mx bike, really not ideal to learn on.