Best Motorcycle CC for a beginner HELP?

Hi im looking into getting a bike and dont know what kind to get. I know a bunch of people say ninja 250 but is that enough power to be on freeways. I have to take a freeway to work so thats why im asking and ontop of that will it have enough power to maintain those speeds for a while. My drive to work is about 25 min and im 6 ft tall and 320 pounds thanks.

If the clutch were slipping it would be revving high while going slow .

I'd first read the plugs to see if they are even ( firing on all cylinders ) ,and rich or lean .
If any plugs are suspect ( darker than others ) I'd pull the boot while running to be sure there is spark .

Next ,I'd be checking for air leaks ( a can of brake cleaner at the intakes ) and vacuum line inspection .

Then fuel pressure and TPS voltage ( you mention throttle body so I assume it's injected .)

Look at those plugs , they will have a tale to tell you and go from there .

I'd also put the stock exhaust back on until the real problem is resolved .

Is it wrong that I want to name my kids like this?

Okay so basically, I have come up with a plan for baby names. (I know, I'm too young to be thinking about children but w/e) So if I have a girl...

I am so sorry but I have to agree with your Mom.

I witnessed an accident last year.

It was a guy and his girlfriend. He was thrown clear but she was not so lucky.

She was pinned underneath it...the metal burning her legs....until the Fire Dept arrived, about 20 minutes later.

I will never forget her piercing screams.

They may seem like fun but very dangerous.

Your Mom loves you very much and does not want you to get hurt....or worse....you may not be coming home at all.

The bike was leaking oil I found this screw was all the way out. What is it for? It is next to the intake manifold and has a plastic cover on it which saved the screw from falling out and getting lost.