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Hey guys, just bought a second hand 2017 CBR100RR, and started noticing that mainly on third gear (but can happen in any gear) between 3600 and 4200 RPMs the bike sometimes starts like a grinding noise, If I go up a gear the rpms drop and the sound stops until it gets to 3600 and 4200. Any thoughts what this could be?
 

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Hello,
Welcome to the forum!
I'm sure you'll find lots of useful info here, or some of the experienced folks will help you out.
 

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2012 CBR1000RR
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Hey guys, just bought a second hand 2017 CBR100RR, and started noticing that mainly on third gear (but can happen in any gear) between 3600 and 4200 RPMs the bike sometimes starts like a grinding noise, If I go up a gear the rpms drop and the sound stops until it gets to 3600 and 4200. Any thoughts what this could be?
Just a wild speculation, but if it rattles/buzzes it could be your Cam Chain Tensioner (CCT). I had this issue on my 2012, went with a manual one to finally solve (mostly) the issue. (Even though yours is newer, could be a CBR thing)
 
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