Chainsaw Repair

I've been noticing several of the plastic covers for the poulan 415 425 445 475 505 have some weird wear patterns I havent seen on other plastic covers. 

Here is 2 with the wear and 1 not showing the wear.

I have my thoughts on whats causing this, but want to see what others think.



Also notice the different shades of yellows.

http://i59.photobucket.com/albums/g289/doemaster789/415/asticcovers001_zps85e73067.jpg
http://i59.photobucket.com/albums/g289/doemaster789/415/asticcovers002_zps8fc4617d.jpg

I was there in the shop looking at them last week and other than that the worn ones apparently had a lot of use, I have no explanation?

Maybe they were over tightened?

+1

I can verify that the one cover in the middle had a bar plate on it.

I was hoping you knew. 

Here is the outer cover bar plates.   I'm not sure on all the husqvarnas that used this plate but here is my guesses.  husky 266 61 268 2100 272 66 part # 501444501

I am thinking of the ones with the wear. Grinding them down flat again and use outer  bar plates.   Should work wouldnt you think?

i'd grind them down. the damage happens due to people not cleaning the surfaces while putting the bar back on or when they loosen it up to retighten the chain. crud gets in there and gives you a false tightening. once you start the saw and start cutting, the dirt falls out, leaving you with a slightly loose bar. most homeowners complain of the chain being tight, but it loosens off when they start cutting. and this confuses them. so they just gorilla arm them tighter to the point the bar starts cutting into the sides (or worse). the bar will do this also when it's just loose enough to move around a bit aswell, like on the tooless side covers.
i agree on adding the metal plae to the side cover. i have no idea why it wouldn't be common practice on a plastic side cover. don't know their thinking other than that huge extra cost of adding it and the idea that these saws were only meant to last a couple few years before the clutch cover would ever need replacing or cleaning up.