I found an ad on CL for a MS 280 (or 290 cannot tell from picture) Stihl Chainsaw that is not working. There is no description of the problem other than engine problems. The picture looks like its in excellent condition. I sent an email inquiring about more information. The seller is asking $80 obo for it. I am wondering if you think it might possibly be a good deal. Also what problems could I be looking at? Thanks for any input.