Anyone got a Yz motor,

[250-R-250]

I really havent researched this much, but I may look into putting a yz motor in my R frame, Does anyone have one, and what would you sell for? I mean if I can get an R motor for the same as a yz, than I am gunna go with the yz, No indepth info needed yet, just give me the price, condition, size

Thanks