Okay, how are you adjusting the chain? You say, "the chain is tightening after about 4-6 cuts and I have do dissamble the bar and chain and re adjust." Are you taking the saw apart to adjust the chain? All you do is loosen the bar nuts slightly, just enough to let the bar move a tiny bit, PULL UP ON THE BAR and adjust so the chain is properly tightened. If you pull up n the bar and adjust so the chain is free moving but with no real slack you should be good to go. I've seen a lot of rigs with the chain running way too loose and way too tight. And if you don't pull up on the bar a bit and tighten the bar nuts good it'll move on you. It'll get tighter if you didn't pull up on the bar and get the nuts tight.
Also, if all this is correctly done and you still have the issue it can certainly be oiling. Some times you need to enlarge the oil hole in the bar a size or 2. And you are cleaning the bar groove and oil hole, right? All common issues.
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