^Very true. I can handle a Dizzer 400 but they're so damned expensive and I like having a faster throttle response and the sudden rush of the power band is orgasm-inducing. xD
I know It's a BITCH to start a large-displacement 2-stroke but a 125 is an entirely different story than a 500.
My buddy had a YZ250 at Glamis, it started in 2-3 kicks easily.
While I haven't ridden a dirt bike in years, a 125 YZ is probably very peaky and somewhat hard to ride. You need to shift a lot. I would think a 200 or 250 four-stroke or a two-stroke enduro type would be better to learn on. BTW I love two-stroke power, it's instant unlike a four-stroke.
Not any longer.You don't need a 250 2-stroke for a beginner's bike, I'd say a 250 4-stroke bike would be optimal. People always say you need "more power for your weight zomg!" It's not true, you need something that won't dump you on your arse so you can learn to ride, then move to a bigger bike.
4-strokers are MUCH gentler than 2-strokers.
2 stroke MX gearing ratio required a bit more attention on trails, however you get use to it.a 125 2 stroke will have plenty of power, but make sure the frame/suspension is big enough for you. 2 stroke 250 wasn't that much fun for me b/c I felt like I was just being take for a ride instead of riding the bike. It was either nothing or....rev up the clutch and hold on for dear like. Also, 2 strokes are generally harder to ride on a trail b/c you gotta use clutch work a lot more. If you want to just ride and forget it, get a 4 stroker. I have an old 4 stroke 250 that is perfect for a beginner, not super powerful though. I'd go 400 or 426 4 stroke personally.