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Discussion Starter #1
Hi, new to this forum.

Have a 2004 CBR 600 RR and I was riding a couple days ago and the engine started to make a very loud knocking noise, sounds like it's from the right hand side.

I took off the clutch cover and could see nothing wrong and so also took off the head cover and again nothing.

The engine starts fine, revs fine and goes through the gears fine but the knocking noise is unbearable. I replaced the CCT with a manual one and tensioned it correctly to no avail.

Any ideas? I do have video with the sound but struggling to attach it, will only let me attach photos
 

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Just upload to youtube and link it.

unfortunately it sounds like you are describing a rod knock :frown2:
 

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I am no expert but by your description (and sound in the video) it seems like the main bearings are buggered? I sincerely hope I am wrong.
If it were the main bearings, there's no way you'd be able to see it by removing the clutch cover or the head.
If you're lucky you could get away with replacing just the affected rod/bearing but wouldn't make sense financially or practically because it's best to change all of them at once, and then you'd probably need to polish up the crankshaft in case it's damaged by the shot main bearing. Lots of time involved and possibly money if you need to get it fixed by someone else.

How was the power delivery when riding as it occurred? Please don't go full throttle and test this out in case it is indeed the main bearings

It's probably only slightly worn out, but with higher rpm it will make more noise and get worse. Best to not fire it up until it's confirmed.
 

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Discussion Starter #5
This is why I'm slightly confused because I suspected bearings, however the bike runs perfectly as it should and the power deliver is fine just a very loud knock!

When I took the head off some of the bolts on the cam chain cogs were loose, the gaskets around the engine look new and I'm wondering if it's been rebuilt and some of the bolts have not been hardened off properly causing the knock?
 

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Sounds like a main bearing or a rod bearing. It would not be unusual for the bike to still run decently well with such a condition, however, surely it will not run for long.
 

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Sounds like rod knock, drain your oil & if you see bits & pieces of metal in the oil your engine is screwed.
 
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