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 Rubber Belt / Bird Squeaking Noise From Exhaust

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Bbbbbbad
Carlotto
Carlotto
Bbbbbbad

Posts : 27
Join date : 2020-05-23

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PostSubject: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Wed Jun 24, 2020 5:13 am

I haven't noticed it before but after I balanced the TBs I have what sounds like a loose rubber belt noise / small bird squeaking from the exhaust

It's noticeable from idle and particularly if I blip the throttle

As the only belt is on the alternator and that's at the front and this noise seems to be from the exhaust I'm wondering if balancing the TBs could create a resonance or something ?

I haven't looked at the Alt belt yet but the noise isn't coming from the front
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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 7752
Join date : 2013-09-30

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PostSubject: Re: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Wed Jun 24, 2020 5:20 am


Possibly something resonating. What pipe? If it's a Termi, that's highly likely.





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Bbbbbbad
Carlotto
Carlotto
Bbbbbbad

Posts : 27
Join date : 2020-05-23

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PostSubject: Re: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Wed Jun 24, 2020 5:34 am

It's a Scorpion - straight through, no baffle

I'll try adjusting the TB air screw slightly and see what happens
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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 7752
Join date : 2013-09-30

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PostSubject: Re: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Wed Jun 24, 2020 2:37 pm


Yeah, I awoke in the wee hours and cried out "it's not a Termi".

Please excuse my bad memory. I can barely remember what I did yesterday.



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eeyore
Grignapoco
Grignapoco
eeyore

Posts : 148
Join date : 2016-09-09

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PostSubject: Re: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Thu Jun 25, 2020 8:46 am

Big singles and twins occasionally have a chirping exhaust sound. Never bothered to investigate but could be a very slight air leak or part of the international baffle tube resonating. My time spent owning/ riding Guzzi twins is far to brief to claim that I have noticed this characteristic on GRiSO’s etc.
Put a rolled up cloth over the exhaust outlet to mute the sound and possibly help identify the source.
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

Posts : 7406
Join date : 2013-05-29
Age : 63

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PostSubject: Re: Rubber Belt / Bird Squeaking Noise From Exhaust   Rubber Belt / Bird Squeaking Noise From Exhaust Icon_minitime1Thu Jun 25, 2020 3:11 pm

Cracked pretzel?
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