ShaneLogs
Addicted to ArboristSite
A 20" 3/8 Oregon Lite bar with a replaceable sprocket tip on it. A Stihl Rollomatic E, ES, or an E-Lite bar would be really good on that saw too. It all depends on what your cutting like what WhiteSpider said, a semi-chisel or a full-chisel chain would be really good on a MS290 too. You could also think about running a skip chain on it too.