Looking for help researching noise/vibration problem

[bmwcyclist]

Test drive completed.

The TB work made a huge difference in responsiveness and overall performance.

Unfortunately, it made no change in the vibration and sound issue other than now the engine is quieter to it made the errant sound more clear.

You can hear the sound QUIT between 2 and 3 seconds into the video.

[Laitch]

Good recording!

Now it sounds to me like vibration acting on a body panel or panel fitting. Are the airbox clips tight? Is the air snorkel loose. Is there movement of any fairing. Is a radiator cover grill loose?

[bmwcyclist]

Good recording!

Now it sounds to me like vibration acting on a body panel or panel fitting. Are the airbox clips tight? Is the air snorkel loose. Is there movement of any fairing. Is a radiator cover grill loose?

Thanks!

Airbox clips are in place in tight, I put in a new air filter during the TB work and also removed and reinstalled the air snorkel and front bottom of the faring.

The vibration is enough that I feel it and there is no significant wind/airflow to move a body panel.

[Laitch]

The vibration is enough that I feel it and there is no significant wind/airflow to move a body panel.

I'm not referring to airflow; I'm referring to the sympathetic vibration of a part or fitting.

[bmwcyclist]

I'm not referring to airflow; I'm referring to the sympathetic vibration of a part or fitting.

I thought so, just covering the bases.

[The Mighty Gryphon]

At what rpm does the noise stop? 

My K75RT does a very similar thing.  The noise starts just above idle, somewhere between 1200-1300rpm and goes until the rpm gets to about 2000-2200.  Then it suddenly stops as yours does. 

The only difference with your noise is that it doesn't have quite the metallic clank to it that mine has, otherwise it's exactly the same.

[bmwcyclist]

At what rpm does the noise stop? 

My K75RT does a very similar thing.  The noise starts just above idle, somewhere between 1200-1300rpm and goes until the rpm gets to about 2000-2200.  Then it suddenly stops as yours does. 

The only difference with your noise is that it doesn't have quite the metallic clank to it that mine has, otherwise it's exactly the same.

interesting. I will check.

[bmwcyclist]

I believe I have found the problem.

As previously stated the sound / vibration seemed to be on the alternator side.

I spent some time with a mechanics stethoscope and the sound seem to be coming from the bell housing area.

I ordered a new alternator from enduralast, it arrived yesterday.

I pulled the alternator. I could find no play, although there seemed to be an almost imperceptible rough spot, the ne alternator did not have one.

I checked the alternator dog and found some slight play.

The monkey nuts were ok, but oddly worn considering I replaced them only a few months ago.

I removed the bolt holding the alternator dog and found it was only hand tight.

I put a lock washer under the bolt and reinstalled the dog. Now it has no play.

I installed the new alternator with a new set of monkey nuts.

Noise and vibration were gone, noticeable change in sound.

Went for a 5 mile test run, so far no return of noise.


.

[volador]

I believe I have found the problem.
As previously stated the sound / vibration seemed to be on the alternator side.
I spent some time with a mechanics stethoscope and the sound seem to be coming from the bell housing area.
I ordered a new alternator from enduralast, it arrived yesterday.
I pulled the alternator. I could find no play, although there seemed to be an almost imperceptible rough spot, the ne alternator did not have one.
I checked the alternator dog and found some slight play.
The monkey nuts were ok, but oddly worn considering I replaced them only a few months ago.
I removed the bolt holding the alternator dog and found it was only hand tight.
I put a lock washer under the bolt and reinstalled the dog. Now it has no play.
I installed the new alternator with a new set of monkey nuts.
Noise and vibration were gone, noticeable change in sound.
Went for a 5 mile test run, so far no return of noise.

Great job! You've quickly become the resident alternator expert. Stay safe

[milq]

Now we all know who to contact for alternator problems!