2 stroke dirt bike maintenance?

[elliotmotocross]

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