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Offline Amokke

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Strange idling noises
« on: 18 June, 2019, 05:21:12 AM »
Hi,

I noticed some strange knocking noise when I stop at traffic light. It happen when the engine is well wormed. I visited my dealer which is 250km away, and normally the noise wasn’t present :) When I came back it appeared again.
I would appreciate if someone can suggest any solution.


Offline Art

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Re: Strange idling noises
« Reply #1 on: 18 June, 2019, 10:57:34 PM »
Difficult to tell from what you've posted but I'm drawn towards the cam chain tensioner, the little cone shaped protuberance on the right hand side of the cylinder head. I'd also suspect...
Valve gear - at what mileage was the valve clearances last checked, current mileage.
Also in and around that area are the valve springs, timing chain and piston rings.

Maybe you need to listen in with a stethoscope, cheap as chips on eBay

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R6.TR12.TRC2.A0.H0.Xmechanics+.TRS0&_nkw=mechanics+stethoscope&_sacat=0


« Last Edit: 18 June, 2019, 11:03:27 PM by Art »

Offline Amokke

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Re: Strange idling noises
« Reply #2 on: 19 June, 2019, 07:23:01 AM »
I tried to retention the CCT and no change observed.

The knocking noise is not permanent. Sometimes it disappears. I can’t catch the pattern yet. It seems that it changes by inclining the motorcycle. By little increasing of revs or closing the exhaust it disappears.

I will give a try with stethoscope.

Offline Art

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Re: Strange idling noises
« Reply #3 on: 19 June, 2019, 09:19:51 AM »
It is not possible to re-tension the Cam Chain Tensioner, it has no adjustment and automatically applies a preset tension on the chain via a spring, plunger and guide rails. If the CCT mechanism is worn or sticking you could experience such a rattle as you have. There are instances where releasing the CCT tension and letting it reset has freed up a sticky CCT plunger, however, you need to bear in mind that whatever caused the plunger to stick in the first place will, sooner or later, cause it to stick again.

Offline Tumaca

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Re: Strange idling noises
« Reply #4 on: 28 July, 2019, 08:13:30 PM »
I suppose you are refering to the "metallic" (cli, cli, cli...) noise that can be heared when you focus the right side of the engine, right?

99% is the CCT. Is easy to change but not cheap (100€).

When a hydraulic CCT fails (or sounds), sometimes it "recovers" the tension revving quick the engine under load. In 2nd o 3rd gear go from 3500-4000revs to 8000-9000revs with full throttle (if in 2nd gear watch out for wheelies) and then close throttle suddenly letting revs fall until 3000. Then check if the noise is still there.

This is a quick, funny and cheap way to try a CCT "recovers" its tension.
« Last Edit: 28 July, 2019, 08:15:12 PM by Tumaca »

Offline J-man

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Re: Strange idling noises
« Reply #5 on: 28 July, 2019, 08:20:18 PM »
My engine has that too, typical for these engines I've heard, seems to have no negative effects except for the sound.
I'd gladly spent 100$ to get it smoother if I was sure its only the CCT just replacing.

Offline Art

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Re: Strange idling noises
« Reply #6 on: 28 July, 2019, 10:04:01 PM »
You could always try re-seating the CCT - Remove the 8mm bolt, insert a small flat blade screwdriver, wind the tensioner mechanism out (clockwise) and then release allowing the tensioner to spring back.

Offline J-man

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Re: Strange idling noises
« Reply #7 on: 28 July, 2019, 10:46:13 PM »
*Originally Posted by Art [+]
You could always try re-seating the CCT - Remove the 8mm bolt, insert a small flat blade screwdriver, wind the tensioner mechanism out (clockwise) and then release allowing the tensioner to spring back.
Like this:
cbf1000 has same type cct
Gonna try that trick and hope my idle knocking quits, but I hear that cct-ticking sound is not particulary at idle.



This guys loosens the manual cct to hear how it sounds, start at 5min10sec. This problem sounds different than my idle knock.
« Last Edit: 28 July, 2019, 10:58:23 PM by J-man »

Offline Art

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Re: Strange idling noises
« Reply #8 on: 29 July, 2019, 02:03:45 PM »
Yes, just like that. Of interesting in the last video as much as I like Loctite 243 a better solution would have been to fit a second 'locking' not much like as used on the rear wheel adjusters.

Offline catford lad

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Re: Strange idling noises
« Reply #9 on: 12 September, 2019, 03:34:54 PM »
Sorry to disagree with everyone,  but I don't think it's the CCT, as it's more of a knocking than a ticking. I changed my CCT for exactly the the same noise and it made no difference. I took to an experienced mechanic (admittedly a BMW specialist) and he said it sounded like the throttle bodies were slightly out of balance. I'm inclined to agree as the sound disappears off tick over.

 


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