Author Topic: V7 Buzzing sound?  (Read 471 times)

Offline mr_pacman

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V7 Buzzing sound?
« on: May 15, 2021, 04:45:40 PM »
I've noticed my 2014 V7 makes a buzzing sound for a few seconds, and then 5 mins or so later, it buzzes again. The buzzing lasts for 2 seconds or so.  I had a very good look all over and can't find any rodents or a wasp nest in there :)

Does anyone else's bike do this?

This is happening with no keys in the ignition, sitting stationary while parked. The sound appears to be coming from or under the fuel tank or in that vicinity.

Thanks
James

Offline guzzisteve

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Re: V7 Buzzing sound?
« Reply #1 on: May 15, 2021, 04:55:30 PM »
Fumes from fuel tank, often called a moaning cow, all could have a different tune.
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Offline Zoom Zoom

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Re: V7 Buzzing sound?
« Reply #2 on: May 16, 2021, 05:53:03 AM »
Just to add to what Steve already mentioned, if the noise you hear is the evap system, you can simply open the fuel cap. If the noise stops when doing so, that is certainly the source. It is normal and nothing is wrong. Of course you would not leave the fuel cap off. This is just a way to prove what is happening. As I said, if this is what is going on, it is normal.

Since you did not elaborate, we are assuming this occurs after you stop the bike after a ride. Is that correct?

John Henry
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Offline Kiwi_Roy

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Re: V7 Buzzing sound?
« Reply #3 on: May 16, 2021, 05:56:32 AM »
+1, mine does that mostly when I bring it inside out of the hot sun, can moan away for an hour sometimes in bursts of a few seconds.
« Last Edit: May 16, 2021, 05:57:20 AM by Kiwi_Roy »
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Re: V7 Buzzing sound?
« Reply #3 on: May 16, 2021, 05:56:32 AM »

Offline Bulldog9

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Re: V7 Buzzing sound?
« Reply #4 on: May 16, 2021, 06:04:59 AM »
As others have said it's completely normal. It's fuel vapor pressure in the tank. The MGX 21 used to put out what my grandson said sounded like whale song for a couple hours.
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Offline Moparnut72

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Re: V7 Buzzing sound?
« Reply #5 on: May 16, 2021, 09:42:08 AM »
When the engine in my Audace was replaced the shop vented the tank directly to the atmosphere. My V7 is stock  and moans after coming out of the garage. My first stop is usually at the post office a couple of miles away. It waits until I come back out and stand the bike up and then let's out a nice long moan. People give me a strange look. I think it is funny.
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Offline mr_pacman

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Re: V7 Buzzing sound?
« Reply #6 on: May 16, 2021, 11:16:29 AM »
Thanks for the replies.

This sounds different than gas venting. Plus, it's too consistent  in the duration of the sound. It's a buzzing sound like a bee for 3 seconds, then it shuts off. After a few mins, it does it again for the same duration and it's the exact same sound.

This happens even if the bike is cold and hasn't been running for a few days. 

I think something else might be going on.

I did some google and someone mentioned something about a stepper motor on a different model Guzzi.

Does this new information provide any clues?

Thanks
James

Offline Zoom Zoom

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Re: V7 Buzzing sound?
« Reply #7 on: May 16, 2021, 12:21:00 PM »
If it's electrical, I would start by pulling one fuse at a time until you isolate the trouble to one circuit. Then go from there.

ZZ
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oldbike54

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Re: V7 Buzzing sound?
« Reply #8 on: May 16, 2021, 12:46:21 PM »
 Could be the fuel pump buzzing , try cleaning the petcock and replace the fuel filter .

 Dusty

Offline Vagrant

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Re: V7 Buzzing sound?
« Reply #9 on: May 16, 2021, 05:00:57 PM »
My thoughts too but he said it happens with the key off so I hope that's not it. Hope he doesn't have rattle snakes where he lives!
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Offline mr_pacman

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Re: V7 Buzzing sound?
« Reply #10 on: May 16, 2021, 05:03:26 PM »
My thoughts too but he said it happens with the key off so I hope that's not it. Hope he doesn't have rattle snakes where he lives!

What are we hoping it isn't is?  The fuel pump?  Would that buzz if the key is out of the ignition or you hoping it's not something else? 

I'll start pulling fuses tonight and see what happens


Thanks
James

Offline Vagrant

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Re: V7 Buzzing sound?
« Reply #11 on: May 17, 2021, 07:40:23 AM »
If it is the fuel pump buzzing without the key in the on position or completely removed, you have a problem. The fuse thing should tell you.
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Offline Zoom Zoom

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Re: V7 Buzzing sound?
« Reply #12 on: May 18, 2021, 06:04:40 AM »
Just checking in to see if you have made any progress?

If you don't have a wiring diagram, it would be worth obtaining one for your bike. Just be certain the one you are looking at pertains to your bike and not a previous of latter model of V7.

John Henry 
A wide, unfettered road ahead,
and the flying motor singing.
Samuel C. Lancaster 1921

Offline mr_pacman

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Re: V7 Buzzing sound?
« Reply #13 on: May 18, 2021, 09:12:03 AM »
Just checking in to see if you have made any progress?

If you don't have a wiring diagram, it would be worth obtaining one for your bike. Just be certain the one you are looking at pertains to your bike and not a previous of latter model of V7.

John Henry

I took a few of the fuses out last night. No change. Still makes the buzzing. I'll do the rest today.  I'll also buy the hi res wiring diagram from AF1 racing as they have them online for sale (along with the service manual which is nice).

I'll post up my results here either asking for more help or with, hopefully, the problem rectified for future reference.


Online Tom H

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Re: V7 Buzzing sound?
« Reply #14 on: May 18, 2021, 11:15:59 AM »
When you stop the bike lets say at home with the same conditions that make the bike buzz. Try disconnecting the battery ground. Sure way to tell if it's electrical. Then...???

Just an odd thought. Depending on how it's wired, maybe the horn is getting power, not enough to make it beep, but enough to make it just buzz??

Tom
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Offline John A

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Re: V7 Buzzing sound?
« Reply #15 on: May 18, 2021, 11:22:20 AM »
When you stop the bike lets say at home with the same conditions that make the bike buzz. Try disconnecting the battery ground. Sure way to tell if it's electrical. Then...???

Just an odd thought. Depending on how it's wired, maybe the horn is getting power, not enough to make it beep, but enough to make it just buzz??

Tom



This, Iíve had one that did this, switch was dirty.  You didnít say if it stopped when you opened the fuel tank?
John
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Offline Zoom Zoom

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Re: V7 Buzzing sound?
« Reply #16 on: May 18, 2021, 04:33:58 PM »
He did say it happens even when the bike has not been ridden. That pretty much rules out the vapor recovery system. The only thing left on a not run, cold bike would most likely be electrical.

ZZ
A wide, unfettered road ahead,
and the flying motor singing.
Samuel C. Lancaster 1921

Offline Kev m

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Re: V7 Buzzing sound?
« Reply #17 on: May 18, 2021, 06:42:10 PM »
He did say it happens even when the bike has not been ridden. That pretty much rules out the vapor recovery system.

Not really. Not if there is any ambient temperature swing in the garage.
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