K-buzz question - BMW Luxury Touring Community
 
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post #1 of 11 Old May 11th, 2007, 9:08 am Thread Starter
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K-buzz question

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?
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post #2 of 11 Old May 11th, 2007, 9:50 am
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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....

Allan..Illinois, Oregon, Arkansas, and tomorrow the Universe
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2004 R1150RTP - Combat Touring
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post #3 of 11 Old May 11th, 2007, 9:59 am Thread Starter
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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?
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post #4 of 11 Old May 11th, 2007, 1:29 pm
 
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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.
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post #5 of 11 Old May 11th, 2007, 1:37 pm Thread Starter
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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.
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post #6 of 11 Old May 11th, 2007, 3:12 pm
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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..........

Allan..Illinois, Oregon, Arkansas, and tomorrow the Universe
2003 K1200LT trike - Starfighter
2004 R1150RTP - Combat Touring
IBA #38152
BMW-MOA 97667
Patriot Guard Riders
...and man of leisure


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post #7 of 11 Old May 11th, 2007, 3:13 pm
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Only way to check is visual inspection...........

Allan..Illinois, Oregon, Arkansas, and tomorrow the Universe
2003 K1200LT trike - Starfighter
2004 R1150RTP - Combat Touring
IBA #38152
BMW-MOA 97667
Patriot Guard Riders
...and man of leisure


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post #8 of 11 Old May 11th, 2007, 3:42 pm
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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.

Joel
'02 K1200LTC
"Mauve Mile-Eater"
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post #9 of 11 Old May 12th, 2007, 4:45 am
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Greetings all.

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

Kindest regards to all.

Paul Harrington
AU

E: [email protected]

1999 K1200LT Champagne "Bismarck"
1983 base K100 "Bavarian Belle"
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post #10 of 11 Old May 27th, 2007, 2:06 pm Thread Starter
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K-buzz update

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.
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post #11 of 11 Old May 27th, 2007, 2:37 pm
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Thanks for letting us know what you did and the outcome. Adds to the databank in my head.

Bill
Guilford, CT
'99 Canyon Red K1200 LT - Buddah Bike
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