loud buzzing

[scottsgs]

Hi all,

I have an 81 GS 850 G. Just recently I have been hearing a loud buzzing when the engine gets up to 3500 rpm, and goes away at about 4000 rpm, and there's no noise below 3000 rpm at all. Could this be valves? The bike has 19,500 on it.

Thanks Scott

[Tarbash 27]

You could just have something loose and vibrating making a buzzing sound. My gas tank starts to vibrate at around 5,000 rpm and makes a buzzing sound. Its kinda weird.

[earlfor]

Shouldnt happen. I betcha you dont have your rubbers installed. There should be three, one on each side at the front and one at the rear hold down.

E.

You could just have something loose and vibrating making a buzzing sound. My gas tank starts to vibrate at around 5,000 rpm and makes a buzzing sound. Its kinda weird.

[aosmith]

When my old A6 needed valve thats exactly what it did...

[chef1366]

I think Earl is refering to fuel tank rubbers.:-D Is there less of a buzz with a full tank of gas?

[txironhead]

I think Earl is refering to fuel tank rubbers.:-D

I hope so, I would never recommend using three rubbers at once otherwise.....:shock:

It would really help if you can locate a general area of where the buzzing is coming from. I had a situation similar to that that turned out to be a loose side cover.

[ifly85]

If you can get the buzzing to happen when you have it in neutral, then you should have some luck tracking the sound to a small area. Get it on the center stand and check it out.

Good luck.

[Steve]

I hope so, I would never recommend using three rubbers at once otherwise.....:shock:

Especially when he recommends two in front and one in the rear. :shock:


.

[bwringer]

Might also be something loose inside the exhaust. But that's normally described as a gawdawful metallic rattle, not a buzz.

It could also be as simple as a bracket resonating at a certain RPM. For example, the horn bracket might be bent or just a little out of position, letting it buzz against the frame at certain resonant frequencies. Something weird like that.

[brveagle]

Could be your stator... My bike just started doing that a few weeks ago, took off the stator cover and had one screw loose just a few turns that was causing it.