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Old March 25th, 2019, 01:02 PM   #1
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I Ride: 2013 Hyperstrada 821
Strange Front End Noise - Need Help

Hello HS People,

I need a little help identifying a strange sound emanating from the front end of my HS. I have a 2013 HS 821 with 6,200 Miles on the clock. After riding the bike, when it's off and cooling down I've heard a strange sound from the fr=ont end. For lack of a better description, it sounds like a "Chewbacca" like sound or a mooing sound. Here's a video link:

https://youtu.be/jSrhSOvH5Y0

Any advice would be appreciated!

PS It's not hot gas in the tank venting. Just before I shot the attached video I removed the gas-cap and vented the tank.

Thanks!

Russell
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Old March 25th, 2019, 01:16 PM   #2
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is the evap canister still on?
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Old March 25th, 2019, 01:29 PM   #3
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Duc Farts. They can all do it, can or no can. Something to do with pressure relief from the tank. Mine did more often when garaged. I could come out to my bike after it sat overnight and as soon as I opened the door it would fart.
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Old March 25th, 2019, 02:35 PM   #4
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Quote:
Originally Posted by Bones302 View Post
is the evap canister still on?
Thx Bones,

The evap. canister has been removed. The vac lines were capped/plugged and the overflow was left to vent out the lower tube...

Russell
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Old March 25th, 2019, 06:22 PM   #5
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Sounds like something I have had...mine was when my engine heat was cooking the tank and vent stopped venting...if you find the fuel cap super tight...it's the same as mine...removing the canister did help but did not totally solve it...if air is moving over the tank and engine, it's cooling enough to avoid the problem, if sitting and heat saturating, I can still get it...
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Old March 26th, 2019, 08:10 AM   #6
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Everyone,

Thanks for the comments. Unfortunately, a quick search of "Duc Farts" was helpful and yielded the following results/threads.

https://www.ducati.ms/forums/92-hype...seriously.html

Farting noises

https://www.bayarearidersforum.com/m...d.php?t=492893

Its good to know there's a name for this phenomena, thanks "gatdammit". Its also good to know that I'm not the only person wondering why my bike is farting... However, it would be great to know exactly what's responsible for the sound and if it's a potential issue. Are there any Duc techs out there that can advise? And on a quiet night at your Ducati shop does it sound like a barnyard?

I'm surprised that I've never heard anyone else mention this... Again, here is a video of my bike "farting".

https://youtu.be/jSrhSOvH5Y0

Note, I opened the gas cap and vented the tank just prior to shooting this video...

Russell
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Old March 26th, 2019, 09:10 AM   #7
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ha ha - yes , it's from the gas tank. The first time I heard it I was camping and it was a pitch black night. After a couple moos I grabbed my knife and went to confront the lurking danger,,,the rest is history!!
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