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 Clank clank voice from... ???

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okuraner
Grignapoco
Grignapoco
okuraner

Posts : 157
Join date : 2013-11-07
Age : 75

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PostSubject: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Thu Nov 28, 2019 11:53 am

Hi;
When I pull the clutch lever and relase and pull a half way then relase I hear terrible clank noise coming from bottom which I couldn't decide where it comes from. Is it from transmisson or final drive? Any advice?
Cheers
Onur Kuraner
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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 7744
Join date : 2013-09-30

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Thu Nov 28, 2019 1:48 pm


Video won't play for me.

CARC reaction rod bush?


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okuraner
Grignapoco
Grignapoco
okuraner

Posts : 157
Join date : 2013-11-07
Age : 75

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Thu Nov 28, 2019 4:12 pm

Thanks Beetle. I will check it
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Motoguzzimackers
Don Abbondio
Don Abbondio
Motoguzzimackers

Posts : 19
Join date : 2014-06-17

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sat Nov 30, 2019 3:16 pm

It's difficult to see the video, but I gather that you have the bike on the centre stand, rear wheel off the ground. If the rear wheel is not under load, you will get a lot of drive-line lash. It's caused by slack in the system and the uneven firing interval. It's not good for the gearbox and drive-line to do what you're doing.
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okuraner
Grignapoco
Grignapoco
okuraner

Posts : 157
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Age : 75

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sat Nov 30, 2019 3:50 pm

No, no. It was not on center stand, ı was driving in first gear. I wraped the camera behind my seat. That's why it was too shaky. I tried the record the sound.
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Pete Roper
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Pete Roper

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sat Nov 30, 2019 4:42 pm

Onur, listening to it it sounds like the racket made by the face cam shock absorber being incorrectly set up at the factory.

On some of the early 1100's, both GRiSO and Breva, there was an issue with the stacked washers that act as a spring for the shock absorber collapsing over time, this led to the face cams not being loaded sufficiently and the horrible knocking noise is them lashing about under a light and inconsistent load.

There was a service bulletin on this back in the day and the 'Fix' is to insert some more shims under the 'Spring' retainer collar. This requires disassembly of the box and, sadly, isn't guaranteed to fix the issue permanently although it will improve it.

The factory say that the noise won't cause any long term problems but this may just be a way of them trying to wriggle out of their responsibilities at the time. Michael and I have sone several over the years with mixed success in eradicating the noise. None of them have blown up.

Pete
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okuraner
Grignapoco
Grignapoco
okuraner

Posts : 157
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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 4:32 pm

Thanks for valuable info Pete. If you mentioned about MG Technical note 011-2006, I installed 2 shaped washers (part #95129340) 6 months ago. Clanck voice diminished a little. It was worst then you heard in video.But if you were telling about some other part, could you please send me that service note to my email [You must be registered and logged in to see this link.] if possible. Since there is no legal MG service in Turkey I was thinking to bring the bike to Greece which Petar Petkov from Macedonia (this forum member, and good friend) recommended.
Thanks again for your interest,
Cheers
Onur Kuraner
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kubbie
Carlotto
Carlotto
kubbie

Posts : 31
Join date : 2019-03-17
Age : 48

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 5:43 pm

The noise happens when you are moving the clutch lever in and out while rolling down the road??? Thinks its the slack in the driveline. The load in the carc is basically shifting from the drive gear to the driven gear and back again as the clutch is operated.

My old shaft drive ATV would make a similar noise when I chopped the throttle then gassed it again.
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okuraner
Grignapoco
Grignapoco
okuraner

Posts : 157
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Age : 75

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 6:20 pm

You are right, but how come BMW or shaftdriven Honda runs smoothly without any noise?
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Street
GRiSO Capo
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Street

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 7:35 pm

okuraner wrote:
...how come BMW or shaftdriven Honda runs smoothly without any noise?

Because they're not made by Guzzi?
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kubbie
Carlotto
Carlotto
kubbie

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Age : 48

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 8:11 pm

Street has yhe best reason I could come up with.
Just like in a company work van.... mysterious noises miraculously disappear when you turn up the radio (or exhaust note).
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Pete Roper
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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Sun Dec 01, 2019 10:04 pm

okuraner wrote:
Thanks for valuable info Pete. If you mentioned about MG Technical note 011-2006, I installed 2 shaped washers (part #95129340) 6 months ago. Clanck voice diminished a little. It was worst then you heard in video.But if you were telling about some other part, could you please send me that service note to my email [You must be registered and logged in to see this link.] if possible. Since there is no legal MG service in Turkey I was thinking to bring the bike to Greece which Petar Petkov from Macedonia (this forum member, and good friend) recommended.
Thanks again for your interest,
Cheers
Onur Kuraner

I don't have access to the service site any more because I'm no longer an 'Official' service agent but it sounds to me like the repair you carried out is the one in the tech bulletin.

The thing is I don't think they ever got to the bottom of why the washer tower was collapsing. With the introduction of the 8V though the face cam shock absorber was deleted and thedriveline relies entirely on the bonded 'Rubber' insert in the cardan shaft for shock mitigation. With the 1400's, which have no rubber insert, the face cam shock absorber made a reappearance.

As to why BMW's and Honda's don't 'Clank' as badly? I am not familiar with their drive lines so I can't really hazard a guess.

Pete
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Mon Dec 02, 2019 4:19 pm

Sounds like mine does - the front bush is buggered or the holes elongated. But, I have been wrong before and daresay I will again.
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bahamazoo
GRiSO Capo
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bahamazoo

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Mon Dec 02, 2019 11:59 pm

+1 for reaction rod bush...
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Pete Roper
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Pete Roper

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PostSubject: Re: Clank clank voice from... ???   Clank clank voice from... ??? Icon_minitime1Tue Dec 03, 2019 12:23 am

Generally I find if it's the bush you'll get a big 'Clank' when you engage first gear but feeding out the clutch doesn't make weird noises. The 'Chattering Clank' tends to be the face cams rattling against each other as the uneven power pulses and clutch slip come into play. Not saying I'm right as I have limited experience with either problem. (Shrug.)

Pete
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