Help me identify this sound.

[Dino172]

https://www.dropbox.com/scl/fi/7q0a8q378oby1is2frb3v/IMG_0180.MOV?rlkey=1bywn4bmuuql0lgds2cl6r7ry&dl=0


This sound I'm trying to track down under load. I adjusted valves but did nothing. I am now leaning towards clutch or gearbox thrust bearing. Any help is appreciated.

Between 13min-15 min metal tapping rattle sound.

[Dirk_S]

Is it on one side more than the other?
Check the exhaust nuts?
Have you used a stethoscope to try and locate the source?

[Dino172]

Is it on one side more than the other?
Check the exhaust nuts?
Have you used a stethoscope to try and locate the source?

No I can hear from both sides of the fuel tank if I put hy head down.
Exhaust nuts are tight are torqued with nord lock washer.
Can't do that because the sound only appears under load. ( it does not sound like pinging or detention or lugging.)

[Huzo]

Hmmm…
My backyard dyno would be handy.

[Huzo]

Yeah I can definitely hear it.
I don’t know…Yet.
Nothing loose around the throttle body or butterfly ?

[Dino172]

Yeah I can definitely hear it.
I don’t know…Yet.
Nothing loose around the throttle body or butterfly ?

Not that I can see. I have heavy-duty zip ties on it.

[lucian]

chasing noises can be a pain . I always start by winding up to speed on a vacant road and then shutting the engine off and coasting in neutral to  isolate chassis noises form engine / driveline noises 

[slowmover]

I had a noise was driving me nuts until I tracked it down to a loose piece in the headlight housing.

[elrealistico]

I used to worry about annoying noises, but I don't have a wife anymore 

[cliffrod]

I used to worry about annoying noises, but I don't have a wife anymore 

I started losing my hearing instead.  Now my wife has to tell me about annoying noises that I can’t hear….

[Huzo]

I used to worry about annoying noises, but I don't have a wife anymore 

She must be happy now…

[normzone]

Sounds like something flapping against your phone while you record a Moto Guzzi. Either that or something loose flapping on said Guzzi.