Scraping Rattle sound

ConTRo13R

ConTRo13R

ConTRo13R

Soldato
Joined
3 Mar 2008
Posts
3,147
Location
Canterbury, Kent
My CBR 600 f3 has developed this rattling that has a scraping sound to it, almost like something is loose and vibrating/scraping around when the engine is revved between 2.5k - 5k rpm where i think engine noise takes over. I think i can hear it coming from near the back of the engine of the bike

I thought at first maybe it was the CCT, so i bought a manual one and changed it over, set it up how the instructions and interwebs told me, noise still there, tried all sorts of settings and nothing improved.

The noise isn't there at idle only once i reach 2.5k rpm and both with the clutch in or out. Could it be a bearing??
 
Il try and get a video / sound up in the morning.

Bikes done 49k miles. Il check the mounts tomorrow, thanks for your suggestions. Don't suppose the centre stand is prone to rattling?
 
wazza300 said:
cant think whatelse it could be,i doubt its engine/gearbox but not certain
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Iv tried the screwdriver stethoscope on various engine parts whilst holding the revs on and can't find anything . I really do hope it's just a cosmetic rattle rather than engine/transmission.

Hurry up morning time
 
I'm changing the oil tonight after work. Supposedly the oil was changed when I got the bike in January /February time. Iv done just over 2000 miles myself on it.

Here us a video with the sound http://youtu.be/Zx1180swjMY

I'm convinced its not the cct though... If it is bearings I'd imagine it'd be expensive??
 
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No baffles in the exhaust ;-) shall I just re sit the exhaust? I did this a couple months ago and fitted new gaskets, thanks for the help guys. I'm going
go over with a spanner and a keen ear later, I hope it is exhaust.
 
Had a full on inspection over the last few days, dropped oil and replaced with fully synthetic stuff, all bolts are tight all headers on exhaust are tight. Re adjusted cct and it's fine.

Screwdriver stethoscope out and I'm convinced the noise is coming through the exhaust but not the exhaust itself.. Any ideas what could be in the carbs valves that would make this metal scraping sound?
 
I can take it into h's cafe on the A2 see if they'll lend a hand, bike rides ok other than the noise. Iv taken the slip on off and remounted it but nothing changed, iv not got baffles either. Your right though it does definitely sounds like a vibration rattle, the bike is left out in all weather as I live in a flat so it's experienced a lot if rain :-(
 
Haven't made it to the shop yet but took it to see my dad, looks like i learnt something today, although iv taken the removable baffle out there are still baffles around the edge of the exhaust which were loose and sending the sounds up and down the pipes. Looks like you guys were bang on the money, Thank you so much :) we've used a chemical metal epoxy to hold them in place till we have time to take the end can apart or i can afford a new one...... Its curing now so hopefully that is problem solved. Will be back with the results
 
leigh_boy said:
your not a million miles away from me. im in eastbourne and work in hastings, if you wanted to pop down i can go over it with you. if you dont have any luck at the shop.
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And its a beautiful road from me to Hastings,dependent on results i may take you up on this if that's ok
 
Small update... After getting some time to go back out on the bike today the noise was still there :(

So it wasn't the end can, even though now it has been glued it blows at both ends of the can, he now owes me a new slip on :D

Thinking it still sounds like the sound it is echoing through the exhaust i start pulling the whole thing off, the problem, where the down pipes go into the collector in a 4-2-1 fashion as the 2 pipes go into 1 there is a small strip of metal separating the two further into the single pipe...no idea why?? anyhow...this is what was rattling around. Looks like someone before hand had welded it back into place and its come loose again.

Thank you guys for all the support and help through this thread :)
 
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