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engine rattle

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I have an 04 yz250f and have developed a chain rattle noise on high rpm's and on initial decel. Is there any commom wear parts or just normal wear and tear? Is there any way to check if chain is wore out or if tensioner is gone without tearing down to far. thanksfor the help

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pull the valve cover off and rotate the motor while inspecting chain slack, look for links that are binding but by the sounds of i your probably going to end up replacing the chain

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