Rockjock
Addicted to ArboristSite
I have had this issue on a MS 170 and a MS 250. The 170 was cutting some sappy pine and they guy had cut some wood, out it down and when he picked up the saw it was locked tight. Cleaned the sprocket and he reported it never happened again. His chain was a little loose as well. The MS 250 came in on my day off and the sprocket was lucked up tight. Took some work to free it up and it too was used for cutting some sappy wood and I believe the chain was also loose. The bar was replaced under warranty, he was given one off the shelf and we were told to bin the bar and got a credit for the bar. The bar now resides on my 025 and works beautifully.