Off Center Front Tire

[Easy Rider]

Originally Posted by patrick_777

Easy may be really onto something with the tank theory. It could be acting as an echo chamber (like whales have) that changes the pitch depending on fullness.

I don't normally have any body parts in contact with the tank but after hours of riding and an ever increasing butt cramp, one comes up with some.....unusual....riding positions. The tank does have some interesting vibrations at certain speeds. :biggrin:

[patrick_777]

:puke:

I have that same harmonic vibration at speed. Like I've said before, it changed/disappeared when I put on the 16T sprocket, and came back when I switched back to the 15T. It also diminished a little right after I lube the chain, but comes back very quickly.

There are many variables that seem to affect it though, including temperatures/road conditions/fuel amount/etc etc etc...

[Easy Rider]

Originally Posted by patrick_777

There are many variables that seem to affect it though, including temperatures/road conditions/fuel amount/etc etc etc...

Yep. I do find it kind of interesting. I can be on the road for an hour and then suddenly I hit just the right speed....or the wind direction changes....or I go down a slight hill, and there it IS. Might last a few seconds or a few minutes and then it is GONE again for another hour or so.
I think it is a GZ ghost !!! :skull:

Even more "interesting" is the harmonic bounce; when your speed is just right and the spacing of the pavement sections is just SO and it feels like a rocking horse. Only had that happen twice in the last year but it is VERY unsettling the first time.

[Badbob]

Originally Posted by Easy Rider

This is really good, guys. You and Bob both seem really sure you can diagnose this noise without ever really hearing it. That's some nice trick. :roll: :biggrin:

Basically, any thing on the bike that spins could cause these symptoms. However, I have up close and personal experience with chain misalignment and wear causing the sort noise that pulsates and varies with speed.

Engine vibration is normal. Pulsating sounds are not and should be investigated. They may be benign but they could be dangerous.

[Easy Rider]

Originally Posted by Badbob

They may be benign but they could be dangerous.

Thank you! Much better than: "This isn't a normal sound." :biggrin: