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Message: [QUOTE="lwsmithjr, post: 1159019, member: 35074"] You may have checked this already, but on my CRF, this noise got very noticeable all at once....and I had not changed anything. I just happened to pull up the chain one day and look at the rub guard. It had worn through and the chain was rubbing -- and slapping -- directly on the swingarm. The chain had made two very nice grooves in the swingarm from the rubbing. But if you did not pick the chain up off of the swingarm, you couldn't tell it was worn through. [/QUOTE]