Another Vibration

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I get a vibration right at 5500-6300 RPM. Durring my last trip through the mountains I put some carb cleaner into the tank. A few hundred miles later the vibration was gone. I thought there just had to be something plugging up the carbs and it was now cleaned through with that majic bottle of $2.00 carb cleaner.

This vibration has come and gone this year. Yesterday I noticed one of the exhaust bolts was gone. Found a bolt and put it in there. Then noticed the pipe had broken under the heat shield... Keep in mind that my vibration was gone and she felt smoother than ever. I welded the right side a few months ago. Now the left side needs repair. Took the exhaust off and found the right side needed repair again (different place, but close to the old break). Welded both sides up and installed. -Test Drive Time -The dreadfull vibration is back. Ahha, figured it out. But dunno what is really going on here. Got home and thought i would tighten the bolts securing the pipes to the engine. This did not help anything. Th vibration is consistent at the RPM no matter what gear im in. Doesn't appear that the exhaust is touching anything it not supposed to. Can this be related to my carbs or does the exhaust need to be replace?

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Well, just had a look at the micro fiche. Looks like there should be an exhaust gasket there grrrrrr. I cant say that I saw one in any of the pipes. This just might be the source of the problem. Will take a closer look tomorrow.

[bikerphil]

engine vibration

Check out this thread related to exhaust vibration, it may help.

http://xs11.com/forum/showthread.php?s=&threadid=16699

[mro]

cant say that I saw one

Old one's can get "squished" to the point that there hard to see.
Use a thin standard screw driver to probe around to get old one out. No gaskets, exhaust normally leaks enough to be very noticeable.

mro

[Crazcnuk]

Check the rubber mounts at the rear, as well.

Many people lose the factory bolts over time, and use ordinary ones that squish the rubber until the muffler bracket is solid against the aluminum footpeg mount.

The factory ones were a specific length, with acorn nuts, so that they wouldn't tighten too far.