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Chain wear...

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I have a KTM 2012 450 sxf and keep on my maintenance all the time...I just put a new rear sprocket on the rear wheel same size as the original and checked the chain sag. Rode for a hour or so and noticed the top of my chain is worn like the links have been filed down...the sprocket is one of those aluminum center w steel outer teeth...there was some rubbing on the sides of the chain guide that's under the swing arm because of the rivets that hold the aluminum and steel are slightly sticking out...I sanded some of the plastic side walls down so it wouldn't rub and make n annoying clicking sound....but I don't know why the flipping chain is worn down now on the outer edge....the links are not oval anymore and have a flat wear mark on all outer links...And the chain is still within owner Manuel specs...

Anyone?

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You should replace the chain and sprocket at the same time, the front sprocket too. One worn component in the chain and sprocket combined with new parts will rapidly wear the new part.

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