this was common when i had a 2021 cbr650r in 2021 brand new. then in 2023 got another 2021 and it had the same issue. rattle or slight vibration sound around 5.5-6krpm in any gear. bike was stolen so never found the solution.
2021 cbr650r with akarpovic s-h6r11-aft. fit was perfect. but the kit came with a o2 sensor extension wire, which wasn't needed and didn't fit my connector anyway. oem o2 wire was long enough. I'm located in canada.paid about $1400.
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