What is the correct tension for my chain?
Chainsaw chains stretch and become loose during operation.
A properly-tensioned chainsaw chain should still be just a little loose on the chainsaw guide bar, but the chain needs to be tight enough that you can’t pull the drive links out of the bar nose.
A good way to test chain tension is to pull on the chain at the middle of the bar at the bottom, you should be able to create a gap between the bar and chain of approx. 2-3mm, Important: Since the chain contracts slightly when it cools, it should never be tensioned or changed while warm. This could lead to serious problems with the guide bar or motor assembly. It is advisable to relax the chain slightly after use, particularly in frosty weather.[top tip!]