2 stroke dirt bike maintenance?

I was wondering what kind of maintenance i have to do on a 250cc 2 stroke motocross bike, yz250, cr250 or ktm 250sx.
what oils do i use, how often do i do this, is it easier or harder than 4 stroke maintenance. which of these bikes are better ect?

btw i have a CRF250R now, so i know general dirt bike stuff

thankyou

The maintenance schedule will not be anywhere near as intense for a 2-stroke when compared to a 4. The top end will probably be the biggest hit on your wallet. Expect to do this every year or two (a lot more if you get into racing with it). People on here will say stuff to the effect like, you have to waste time measuring the oil to mix in with the gas. If you think about it, as much as you're changing the oil on your racing 4 stroke like maintenance requires, you'll be dumping every 2-3 rides almost the equivalent of what I'm mixing in. Use a good synthetic oil for whatever bike you choose (my personal favorite is klotz, but there's a lot of good stuff out there). Of the 3 bikes you listed the YZ is the best bet. Honda's CR250 is no longer in production and had weird jetting issues. The KTM SX is super light but does not have the power spread of the Yamaha or it's spot-on suspension. Is the new bike going to be used for trail or MX track? The KTM 250 XC would be a better bet if you plan on riding woods.

http://www.yamaha-motor.com/sport/produc...
As you know, the 2 stroke is passe because of its wear and tear factor. The link above shows oils recommended and other info.
http://powersports.honda.com/motorcycles...
0R8
For maintenance, read your owner's manual, this will recommend servicing intervals.
Over time, the 2-stroke will exhibit more need for maintenance than a 4-stroke because of its nature, for sure.
I've owned both bikes, a 250MX Yamaha & Honda, and found at that time the Yamaha to be more responsive, but Honda has made it close today, that I would opt for the Honda because of its positive qualities.
Well at least you have a 4-stroker now, smart move.
Good riding.