K-buzz question

[eotiii]

I know that a vibration is inherent in this engine @ 3k to 4k rpm but I did not have significant vibration until lately. My 02 has 20k on it. I have not changed the air filter yet which I believe may be causing part of the problem. The buzz is even slightly noticeable at idle. How about injector cleaner? Why would the buzz get worse? Any ideas?

[STARFIGHTER]

Are you sure it's vibration ?
My LT started to "Buzz" around 3500-4000 RPM and I looked for vibration..........
Tech thought it was vibration also..........................until we found a crack in the exhaust header...................
Only buzzed at 3500-4000 moving or standing....

[eotiii]

I can feel it through the foot pegs. It seemed to come on quickly. Just noticed it a few days ago. Was your exhaust any louder. How can I check for a cracked header? Where was it cracked?

[messenger13]

The "K-Buzz" should really only be evident between 4500-5000 RPMs. On my '02, it showed up right at 4750. Sounds to me like you have an exhaust system issue. Either a cracked header, or cracked support bracket.

[eotiii]

I am inclined to agree with you guys. The bike has been flawless until lately. It is just enough vibration to be a nuisance. I will have to inspect it this weekend.

[STARFIGHTER]

My crack showed up right at the header where the four separate pipes joined into one.............
Exhaust didn't really get louder, just at that certain RPM it sounded like a piece of tin vibrating..........

[STARFIGHTER]

Only way to check is visual inspection...........

[tarheel_rider]

The exhaust bolts do come loose over time. Every 12K check, put the torque wrench on them to make sure that isn't the cause of the vibration.

[harrowbmw]

Greetings all.

You guys should get around here and ride my '83 K100. Vibes, I'll give you vibes! :rotf:

Kindest regards to all.

Paul Harrington
AU

E: corcaigh@internode.on.net

[eotiii]

Finally pulled off the plastic to inspect the exhaust header. No cracks found. I bought a torque wrench and found that the forward most cylinder header bolts were loose. Re-torqued all of them and the buzz is gone.

Thx to all.

[was]

Thanks for letting us know what you did and the outcome. Adds to the databank in my head.