I have a friend who was building a retaining wall using railroad ties. He went out and bought a new Stihl ms 290 to trim the railroad ties. He then proceeds to start up his new saw. After the start up he tries a cut Blurrr- blurrr-blurr the saw chain doesnt turn. He brings the saw in and removes the chain and reinstalls it. My other friend an I ask him if he took the chain brake off for his first cut and he says no. So he gets it to turn and it does not cut. When installing the chain he put it on backwards. I think he is dangerous with a saw and should not have one. What do you ladies and gentlemen think?