Echo Chain will not rev
Have an Echo CS-440. Was running perfectly until I had to refill the gas tank. The gas was a few months old but looked clean and smelled OK but saw would not crank at all after filling the tank.
Drained the tank and refilled with new gas. Now the saw cranks and idles fine but will not rev up. If I give it about half choke it will rev for a couple of minutes and then bog down. Unchoke and it cranks right back up but still will not rev.