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Nothing better than when someone starts a thread like this and follows through. Have fun, buddy. You made a wise choice.

Bro, you're a big specimen. Fuck a 125. Take the 4 stroke and learn good technique.

What bike is best for you depends entirely on what kind of riding you plan on doing and what your current skill level is. Have you ridden before, are you familiar with a clutch, and do you know how to shift? If you're comfortable on a motorcycle and intend on riding mx then a 250f is probably going to be your best bet. I'm 6'2" 185 and ride something akin to a YZ125 and I have to ride the bike really aggressively to get around the track decently. The 125s make their power high in the rpms and that is...

I’m 6’3 250 pounds and started on a 250 2 stroke a few years ago. I did have a ttr125 as a kid and a few street bikes since I was 16. If you don’t plan on racing mx I’d look for something like a klx300 or crf300f.

That's not a terrible idea. Bottom-mid motor with suspension that's already sprung heavy.

You've never ridden and you're 6'3" and 220 lbs ? KLX all day. Go learn the basics and have fun. If you decide you want to race you can always get a 125 or something else later. Go find some trails and have fun 🙂