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Weird rattle noise on deceleration (video included)

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I have a strange rattle only on deceleration, around what I guess to be 3.5k-2k rpms. It's definitely coming from the motor/head area. Is this chain slap from a loose or stretched cam chain? Piston slap? I've ordered a MCCT just want to know what you guys think. I've included the video here: https://youtu.be/9IcmHzleZII

 

Edited by Rekmore

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Welp, I just replaced the cct and still had the noise. I tried riding around with my helmet off and it is definitely coming from the chain/front sprocket area. Could this just be a loose chain, or something more?

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Welp I tightened and lubed the chain, noise is gone. Some of the chain links look a bit kinked so definitely time for a new one. I appreciate the help thank you.

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