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The chain gets longer as it gets hot. Though some expansion is normal, you should not need to adjust the slack more than once after the chain is warmed up. If the problem persists, the chain is getting too hot because it is dull or the saw has run out of chain lube oil.

A lot of it depends on what kind of chain you're using also. Stihl chain doesnt stretch as much as Oregon (you don't need a stihl saw to run their chain, all the brands work with all the saws..just get the right size). I usually have to tighten my chain a couple of times or so during a day of cutting. you should top off the bar oil everytime you fill up with gas. It doesnt go down as much (pending on if it is adjustable, if it is run it wide open...more is always better than less.)

The shorter your bar the looser you can run the chain. Since on the longer bars it will flip off if it is too loose (28in and longer).

Running a dull chain is just bad all together. Stretching should be that last of your concerns. It will kill your engine fast because a saw engine needs to have resistance against it...with a dull chain there is no resistance so it runs wide open and that's an easy way to melt your piston.

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Q: Why does a chainsaw chain loosen when you are using it?
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