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| Visitor Q |
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Visitor Q
$25 whore
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 Posted: 18:28 - 06 Nov 2008  Post subject: Locating a rattle... diagnostic help... ? |
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Hi, basically my CBR 600 has developed a very loud rattle. If you can imagine bouncing on a trampoline with one spring very overstretched/too large for it, you're in the right area.
I don't know how long its been that way as I usually ride with music, but at most a week.
It doesn't seem to be affecting performance, but obviously I'm a bit concerned.
All the springs on the exhaust system /seem/ tight enough, which takes care of the obvious.
And although the chain clicks when you move the bike around, the rattle goes away when you pull the clutch in and seems rev dependent (not speed). Which makes me think its got to be /in/ the engine.
I replaced the camchain tensioner (CCT) about a year/5000k ago, so I don't think its that. But the bike could do with its valves doing, and I want to know if it is an evil portend.
Anyone got any experience of loud rev dependent rattles who could chuck some ideas in?
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule... |
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| Kickstart |
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Kickstart
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| Vincent |
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Vincent
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| Visitor Q |
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Visitor Q
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| Posted: 19:10 - 06 Nov 2008 Post subject: |
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| Kickstart wrote: | assuming you mean iding, rather than riding along at 60 you can hear the rattle until you pull the clutch |
It's the latter mate. It also kind of slowly fades too, which makes me think its vibration from the drive.
One thing that may be connected is the gear box selector has been very vague recently, with quite a few false neutrals (and this is straight after an oil/filter change).
| Vincent wrote: | I've tried really hard but can't |
No mis-spent youth for you then I take it (or high quality trampolines)  . Ok, well as I was almost certain originally that it was a loose exhaust connector spring, that might give you an idea. It's one of those horrible rattles to describe, but a vaguely loose spring on something constantly vibrating is quite close.
Will have a go with the screw driver idea, but it doesn't seem as pronounced when idling. Only really seems a problem under load (ie moving... which could end up with some funny looks  )
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule... |
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Visitor Q
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| Posted: 23:03 - 16 Nov 2008 Post subject: |
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Christ. Page 5 within 10 days, Workshops got a turnover on it
Just a bit of extra info.
There is NO rattle for the first half a mile/five minutes. Completely quiet. Then it seems to be getting slowly louder as I go along.
The gearbox is still misbehaving regularly, although not necessarily at the same time as the rattle (or proportionately).
But it definitely sounds like its coming from the clutch/gearbox/possible generator area.
I'm hoping it's just the CCT, but its failed very rapidly and sounds a lot more aggressive then when I last had issues.
I hope it's not the gear box :'(
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule... |
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| Pete. |
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Pete.
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| Posted: 19:52 - 17 Nov 2008 Post subject: |
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Sounds like a knackered chain to me. If you have the stretch specs for the chain measure it to see how far gone it is.
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a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good  |
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| Pete. |
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Pete.
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Posted: 20:38 - 17 Nov 2008  Post subject: |
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Could be a loosed or cracked exhaust header. If you are pulling in the clutch then you must also be shutting the throttle and reducing the load on the engine to almost nothing, stopping the noise. The noise a loose header makes sounds just like a mechanical rattle.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Visitor Q
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| Posted: 20:50 - 17 Nov 2008 Post subject: |
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| Geri wrote: | Could be a loosed or cracked exhaust header. If you are pulling in the clutch then you must also be shutting the throttle and reducing the load on the engine to almost nothing, stopping the noise. The noise a loose header makes sounds just like a mechanical rattle. |
Oooh now that sounds more helpful 
I have some horrible multipart blue flame headers (and pipes), and the spring for one side had heat fatigued and pinged off annoyingly. As it was loose and blowing I nicked one from the other side and wedged it on the loose side, stopping the blowing admirably and everything seems tight. I bought /a/ replacement exhaust spring, but I think it's too loose so didn't fit it.
I'll check to see if anything looks suspect that side.
As for reducing throttle with clutch in, I guess thats sound logic. I just did it to check it wasn't the chain/something loose but not reacting to engine vibes.
Why do you think it would only start the rattle when it's warm though?
It does continue after I've stopped and revved it at idle (after its started due to being warm) so it's possible, but the noise definitely /seems/ to be eminating from clutch/gearbox area
I hate diagnosing problems (although this beats an electrical fault anyday)
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule... |
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| Pete. |
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Pete.
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| Posted: 21:01 - 17 Nov 2008 Post subject: |
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Multi-part headers are supposed to be sealed with high temp/flue sealant to stop them leaking/wearing. Akropovik advise this. You can buy tubes of it from a plumbing shop. If you have a spring missing that will cause a leak/rattle many times and yes, heating up will very likely cause it to get worse.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Old Thread Alert!
The last post was made 17 years, 337 days ago. Instead of replying here, would creating a new thread be more useful? |
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