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Clunking noise from motor

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Hey guy my crf makes a noise that sound almost like the chain smacking the swing arm. But I'm not sure if that's it because sometimes it will do it on flat pavement and sometimes going up rough trails and my chain isn't to lose if anything it might me to tight. Help solve my curiosity please

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Yes, the CRF450R, all years, are known for having a VERY LOUD chain slap on the swingarm. Making sure it is tightened per the manual is almost all that can be done to reduce the noise

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Mine smacked so much it started rubbing a groove under the chain slider in the swing arm(the part by the front sprocket) and I ended up putting a piece of rubber hose in between the slider and swing arm to prevent further wear

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