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i was replacing the valve cover gasket on my 2002 Honda 400ex. i noticed the timing chain has been grinding the top of my valve cover. could this mean i need a new timing chain or does it just need to be tightened. has anyone seen this before.
 

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2020 520 rubicon foot shift
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They're know for the timing chain stretching.
The early 2000's crf450r dirt bike timing chain fits and is much better, it never stretches.
When I hopped up mine years ago, I replaced the timing chain at the same time to prevent this.
 
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