Warning - irritating noise content.


My 4000 mile old 1989 FLHS Electra glide is running beautifully, after much advice from the good members here.
The gremlins are driving me mad though.
As I roll off the throttle a gremlin runs his thumbnail along the teeth of a comb Bbbbbrrrrrrrzzzzzz!
We all know that noise from when we did it at school.
Its matched to engine revs, not to bike speed, and I have looked everywhere for it. It happens in all gears and neutral, rolling off the throttle, and I can even control its noise level, its louder completely off the throttle, quieter keeping a little throttle on.
As my bike is the last remaining Harley in the world with standard pipes, I get the pleasure (or not) of hearing this noise.
When I am moving, it happens when I rev with clutch lever pulled in, but when I stop to look for it, I cannot make it happen.


I am hoping that the experts here will now all be nodding knowingly in unison, a small smile playing across the faces.


So, let me in on the secret, what is the gremlin doing?
I will say it again, its engine speed related, not bike speed, rather like a harmonic vibration induced buzz.


Many thanks for your thoughts.

 

Cam gears whining maybe?

 

Have you checked the primary chain tension lately?

 

Exhaust heat shield?

 

Is the source of the noise in the left or right of the motor?

 

If it happens rolling or standing still, I'm going with primary chain.

 

voes switch has a cracked hose

 

My experience of that was that the engine ran like a real b1tch - anything else was a lesser nuisance!

 

the windshield on my 85 buzzes. maybe when the buzzing starts grab the windshield at the top and see if it stops.

 

That was my first thought or something to do with the exhaust system.

OP pipes mount at trans ????

WP