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Hello, I have an 08 kfx 450r, I noticed recently it has developed a weird vibrating/grinding noise when reved to about half throttle. It does it with the clutch in or out and while riding in all gears. I just did a fresh oil change and found nothing in the oil, and filled it back up per kawis specs. I will try to upload a video so you can see what I'm talking about.
 

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Sounds like your aluminum belly skid plate vibrating against the frame... remove your belly skid plate & see if the noise goes away when you rev it...

Many in the past had to add rubber spacers to prevent it from vibrating against the frame...
 
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