Hear a rattling sound between 4-6k rpm on your CBR 600 F4? Sound like a ring of keys jingling below the tank? Could be the cam chain tensioner.
Here’s a handful of threads on the diagnosis:
TwoWheel Forum on CCT
F4i Cam problems on TwoWheel Forum
The joys of the F4i cam tensioner on Sportbikes.ws
F4 Buzzing sound on SportBikeWorld
And the CBR F4i Cam Chain Tensioner (CCT) replacement and upgrade thread on CBRWorld
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One reply on “Honda CBR 600 F4i Cam Chain Noise (CCT)”
[…] rpm. After walking away that afternoon and doing some internet research, I made this post about the cam chain tensioner that plagues many of these F4i’s. Even as the owner said he would drop the price to $5400, I […]