help please I purchased a factory refurbished 445 chainsaw with a 18" bar some time ago to cut down a unwanted tree. Well, I never got the saw to start and it always seemed like there was something hungup. I finally tired starting it without a bar or chain on and wow did it run good. Put the bar and chain on and back to frustration. I looked online and thought maybe it was that the chain had the wrong pitcc so bought a 18" .325 and it seemed to spin but got very hot. When I watched youtube videos, I noticed that chain moving smoothly when the saw was off and realized I can't do that. So, next try was I went to the store and got a new 16" bar and chain to try that thinking maybe the 18" bar and chain just were damaged. When the cover is off, I can move the sprocket and the chain seems to move smoothly, but when mounting the cover I noticed the tensioner is pushing the bar foward so much that the chain is too tight and causeing a bind situation. The tension peg is as far back as I can get it, I even tried removing the tensioner cover to see if I could get the peg to move like 1/8" back but no. I even barrowed a cover from a neighbor's Husky and still too much tension on the bar and chain. SO? is it a bad clutch sprocket? do I drill out the tensioner hole on the bar? do I shave down the tensioner peg? I am at a loss as to why it doesn't line up right. txs for any suggestions