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  1. #1

    Member #
    3668
    Bike(s)
    1997 Honda CBR11xx
    Join Date
    May 22 2008
    Location
    Cheney, WA
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    Buzzing sound - Transmission?

    Hey guys... You guys have helped me out immensely, we so far have fixed the CCT, ran some Seafoam through my baby, figured out my cold starting problem, and changed the oil and oil filter. But now I have what will hopefully be my last request for "problem" information for a while. I hope after this it is all good!

    I'm having an issue with vibration, a metallic vibration for sure. It happens mostly in second and third gear, clutch is engaged, climbing in RPM's, from 3000 to 5000ish, and it's pretty loud. First gear it kicks in around 4500rpm. When I have the clutch disengaged(pulled in), and I rev the bike up to 4500 to 5000rpm, the metallic vibration does not happen. But while riding, it is apparent something is vibrating fairly loudly. I do not believe it is a body panel or loose piece metal external to the engine. I am slightly confused. It (sounds) like it mostly comes from the upper left hand side of the motor.

    It really is a louder "vibration", not a clicking, not the CCT, but a literal vibration. It doesn't seem to increase with the RPM's in magnitude (faster), it just seems to hit at a certain rpm, and leave at another. At the higher RPM's, 5k and above, it goes away.

    I replaced the CCT as I stated, and my CCT problems at idle (slapping sound) and the sound I was getting on the right hand side of the bike went away.

    This is the last remaining problem I seem to be experiencing at the moment. I do not believe it is anything serious as the bike doesn't seem to have any adverse effects from it. The clutch works flawlessly, the bike pulls hard through any gear, I don't get any problems in any way other than this vibration.

    Any help or suggestions, possibly causes would be appreciated.

    Thank you,
    Mario

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  3. #2

    Member #
    3668
    Bike(s)
    1997 Honda CBR11xx
    Join Date
    May 22 2008
    Location
    Cheney, WA
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    Re: Buzzing sound - Transmission?

    Well that just sounds entirely too complicated...

  4. #3
    youfly2
    Member #
    3370
    Bike(s)
    97 Honda Black Bird
    Join Date
    Apr 16 2008
    Location
    Kent,Oh
    Posts
    331
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    2 times

    Re: Buzzing sound - Transmission?

    hey never really heard that when my tranny gave me problems. so unless it's jumping out of gear It's probly not the tranny

  5. #4

    Member #
    124
    Bike(s)
    1997 Blackbird
    Join Date
    Oct 30 2006
    Location
    Norway
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    520
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    Re: Buzzing sound - Transmission?

    Tricky one..! Since the noise/vibration isn't getting worse as speed and/or RPM increase, I believe you can rule out the clutch and the tranny right away. You can also rule out most of the engine components.

    The balance shafts is one thing to look at. The water pump is another.

    Then again, it also sounds very much as you simply have a couple of loose loose bolts somewhere, like the ones that are holding an engine cover in place or something. A loose object attached to the engine/frame would typically pick up the vibrating resonance at a certain rpm range and magnify that frequency in the form of noise and vibration.. Just my .02
    To do is to be - Socrates
    To be is to do - Jean-Paul Sartre
    Do-be-do-be-do - Frank Sinatra

  6. #5

    Member #
    3668
    Bike(s)
    1997 Honda CBR11xx
    Join Date
    May 22 2008
    Location
    Cheney, WA
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    80
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    Re: Buzzing sound - Transmission?

    It definitely seems more "intense" than a body part or something and very consistent in where it shows up in the rpm range. And I can ride the bike hard or easy, and it doesn't matter, it does it either way. Quick up the RPM's or slow just accelerating makes no difference.

    I will check into the balance shafts. I do hope it isn't too invasive as I don't have a dedicated garage to work on the bike and as my only transportation at the moment, I may just wait until I am done with getting married (june 28th) and have a chance to sit down and catch my breath. In the next two weeks, I graduate from college, move 432 miles away into a different state, get married, and have to figure out a way to find a job

    You guys ROCK!

  7. #6

    Member #
    124
    Bike(s)
    1997 Blackbird
    Join Date
    Oct 30 2006
    Location
    Norway
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    520
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    Re: Buzzing sound - Transmission?

    You mentioned that if you blipped the throttle with the clutch disengaged (lever pulled in), there was no such noise.

    What happens if you blip the throttle with the clutch engaged (released lever), in neutral??
    To do is to be - Socrates
    To be is to do - Jean-Paul Sartre
    Do-be-do-be-do - Frank Sinatra

  8. #7

    Member #
    3877
    Bike(s)
    99 Blackbird,99 Busa,01 ZX-12,06 ZX-14,08 MV312R
    Join Date
    Jun 16 2008
    Location
    Colorado Springs, CO
    Posts
    1
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    Re: Buzzing sound - Transmission?

    Very interested in the outcome. I have recently experienced the same problem on my 99 and I thought it may be a loose bolt for the radiator or something. I intend to adjust the balancers to discover if they are the problem.

  9. #8

    Member #
    3668
    Bike(s)
    1997 Honda CBR11xx
    Join Date
    May 22 2008
    Location
    Cheney, WA
    Posts
    80
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    Re: Buzzing sound - Transmission?

    Well, I think there's something to the "clutch" problems. I think it is clutch related. When I have the clutch pulled in, it doesn't make any noises, but with the clutch released and the engine putting torque on the wheel, the vibration comes and goes with RPM and it seems to have gotten worse... I revisited this post because @Athertondevries mentioned he is having a similar issue.

    I've noticed my clutch has been engaging later than it had been when I bought the bike, and I have noticed while the engine is cold the tranny shifts better than when it is warm. I am thoroughly unknowledgeable with a possible solution... Thus far in the three weeks I have owned the bike, I have replaced the CCT, Oil (used honda semi-synthetic), Oil filter, Put the 6mm shim in and replaced the Clutch fluid with a vacuum system and made sure there were no air bubbles causing my clutch problems.

    This is where I am at. Any advice, would be much appreciated.
    Mario

  10. #9

    Member #
    439
    Bike(s)
    '02 metalic cherry red CBR 1100 XX
    Join Date
    Nov 25 2006
    Location
    Vancouver BC Canada
    Posts
    12,548
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    751 times

    Re: Buzzing sound - Transmission?

    Can't offer any advice but I like your town. Been there several times, very nice place. Good coffee houses and some excellent local beer.

  11. #10

    Member #
    124
    Bike(s)
    1997 Blackbird
    Join Date
    Oct 30 2006
    Location
    Norway
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    Re: Buzzing sound - Transmission?

    Quote Originally Posted by desantim View Post
    I've noticed my clutch has been engaging later than it had been when I bought the bike, and I have noticed while the engine is cold the tranny shifts better than when it is warm.
    This sounds a bit like the symptoms you would get from
    A) air in the clutch fluid
    B) clutch fluid leak
    C) bad clutch line (hose)
    D) faulty clutch master cylinder
    E) a combination of the above

    If the clutch is slipping a little under heavy load, the clutch plates would soon become very hot. And as they heat up, they expand. And when they expand, the clutch won't disingage (when you squeeze the clutch lever) completely which will cause excessive "clunking" as you shift gears. If the clutch plates have been excessively heated up over a longer period of time, or they have been through several "(over)heat cycles", they will eventually deform which will cause vibrations...

    It's just a theory, but I'd take a look at the clutch plates and inspect them for any signs of overheating or deformations..

    EDIT: Maybe a previous owner has trashed the clutch by drag racing..?
    To do is to be - Socrates
    To be is to do - Jean-Paul Sartre
    Do-be-do-be-do - Frank Sinatra

  12. #11

    Member #
    1779
    Bike(s)
    HONDA CBR 1100 XX BLACKBIRD XX1
    Join Date
    Jun 12 2007
    Location
    GREECE
    Posts
    1,832
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    41 times

    Re: Buzzing sound - Transmission?

    ...clutch basket exsessive play....?

  13. #12

    Member #
    124
    Bike(s)
    1997 Blackbird
    Join Date
    Oct 30 2006
    Location
    Norway
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    Re: Buzzing sound - Transmission?

    Quote Originally Posted by bullet View Post
    ...clutch basket exsessive play....?
    All BB's have some play in the clutch basket, but I've never heard that this could cause noticable vibrations under load. It's something you would hear with the clutch engaged, in neutral gear, while the engine is idling. So it doesn't really match the symptoms he's describing..?
    To do is to be - Socrates
    To be is to do - Jean-Paul Sartre
    Do-be-do-be-do - Frank Sinatra

  14. #13

    Member #
    3599
    Bike(s)
    1999 stock XX
    Join Date
    May 16 2008
    Location
    Finland
    Posts
    12
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    0 times

    Re: Buzzing sound - Transmission?

    I've got also similar problem in my -99. Gears sound different somehow, second and fourth gear gives a little buzz but sixth gear sounds like a loose washer rattling or something.. The gearbox didn't sound at all when I bought my bird. I changed my oil brand lately, lets see if there's any help.

  15. #14

    Member #
    3599
    Bike(s)
    1999 stock XX
    Join Date
    May 16 2008
    Location
    Finland
    Posts
    12
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    Re: Buzzing sound - Transmission?

    Quote Originally Posted by Nutter67 View Post
    I have noticed that different oil can make a difference to the noise from the gearbox. When Shell SX4 was put in at the last service, the gearbox became noisier. I will see what happens when I change to Motul oil.
    That's very true, I noticed that with my former bike also.
    When I bought my current bike (Blackbird), it had some basic mineral oil in it and it worked perfectly. At first oil change I switched to Motul 5100 10W40, which was perfect for my former Kawasaki. Apparently it didn't suite well for bird.. Now I'm trying with Honda GN4 10W40. Fortunately I've never experienced any metal coming out from gearbox during oil change. That would be a sign of serious damage..

  16. #15

    Member #
    4644
    Bike(s)
    between bikes
    Join Date
    Oct 01 2008
    Location
    Key Westearsheers
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    89
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    Re: Buzzing sound - Transmission?

    Quote Originally Posted by Nutter67 View Post
    A long shot, but possibly balance shafts? There is a thread here on how to adjust them.
    I'm with Nutter. You have not come back with the sync yet. Though, you do mention the vib goes away at higher rpm where it's spinning so fast why whip the throttle when it is either a bearing wobble is I doubt it on the long shot. It could be and now tell me what year is I am stuck with a year being is it carb or injector?

    Shaft to shaft is have you at least inspected for valve adjust being it is strange/new to you and who/when/where are the service documents being how long it sat with clogged injector holes or a jet hardly feeding a cylinder that hesitates to the point it is a long shot the sync is or is not it is clear that valve adjust and sync is eliminate your mechanical vibrations. Then you can tell if a fat injector is spitting drops or mists is did you change plugs or check who is lean/sooty rich?

    SYNC Done????? WOT say ye? One elimination at a time so you can know next time is stop chasing your tail is what is the compression of each cylinder, (after checking the valve lash).

    That bike is hours from ready for your ass salt is FunINN wit day road.


 

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