Stihl 661 chain keeps coming loose

[rumrun999]

Thank you to all for helping on this one. What I have been able to reconcile is I originally kept the chain a bit too loose and caused premature wear on the sprocket, chain and bar. A new chain never did work as the old parts were still wore out and, definitely me needing to have more finess. Parts, new studs, new 32 bar, new chain and new sprocket. Ran today in a 36" oak for 2 hours, was beautiful, nice and snug chain and never loosened.

Thanks again for all your help

 

[chilipeppermaniac]

My initial analysis was along the lines of these posts. Glad you got it sorted out.

New chain will stretch a little at first

My logger buddy runs his 661 with a 30" to 36" bar and the chain always tends to run loose after awhile. He says, "That's the way it is. Chains stretch on long bars, especially new chains. I tighten up after every tank of fuel and sometimes more often. Simple as that."