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Discussion Starter #1
So,
Picked up a used (26K miles) 2001 cbr600f4i runs strong, doesn't seem to have any issues - except one...in every gear the motor seems to make an excessive amount of noise in between 4000 and 5500 rpm. It doesn't seem to affect performance, just makes a mechanical noise that seems like it might be following rpms. It also seems to be more prevalent if I'm on throttle hard and then back off quickly...
Sometimes I can pussyfoot my way through the revs and it won't make noise, but -- who wants to do that :thumbd:

Any thoughts here? Thanks in advance for the expertise...
 

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Discussion Starter #3
That's what I wondered...should I replace it with the stock one (i'm always of the thought that stock is generally better)..or should I use the manual one?
 

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They say that the latest revisions fixed the rattling noise, but as far as I know they still tend to go bad. I personally have an APE manual one. Once properly adjusted, I just take it in to my mechanic to retighten whenever I have a major service, which is every 16000 miles.
 

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Get the valve motor and cable checked. If it's moving violently instead of smoothly (components, wiring or CDI problem), knocking can result. Overly stiff reeds can also cause the problem.:)
 

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Discussion Starter #6
it was the cam chain tensioner. replaced it with a new honda part...runs like a dream now. thanks to all for advice.
 

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Hey danandkasha,

I realize I am reviving a thread, but I'm looking at replacing my cct lifter as well.. if thats what you meant. Is this something I can do without taking the top end apart? Will the lifter just pop out when i take those bolts off and then I can take it off/ reprime it or replace without playing around with the insides? I've got an f2 but I imagine this would be similar.

Thanks!
 

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Nevermind. I found the How-to thread for the f4i. My guess is that it should still apply. If my noise is coming from the right side of the bike, when i am sitting on it. I was hesitant as to whether it is valves or the cam chain... but i guess if it was the valves the sound should be spread out over top end?
 
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