Horrible noise from Front Sprocket area
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  • 1 Post By beestoys

Thread: Horrible noise from Front Sprocket area

  1. #1

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    Horrible noise from Front Sprocket area

    Soooo, went for a ride today - 100kms (62 miles)there and 100kms back, average speed 150kmh (92mph) - on the way home pulled up at an intersection and nothing out of the ordinary until I took off - and sounded like the crunch of an old front wheel drive with stuffed CV joint on full lock

    I stopped, checked it all out, and nothing obvious, no leaks, not extra hot. Had to ride home very gingerly, noise still there, but only when taking off from traffic lights and low speed, low revs - no noise no vibrations at higher revs (3k) 100kms (62mph)

    I can only think that I have a bearing that has failed/failing at the front sprocket - yet to pull it apart, probably won't for a fortnight, have a holiday in Asia to deal with

    Have any of you experienced this - something like this or have any idea what it is?

    Will update when the tools get out and I start to remove the fairing

    just thought it would a good chance to ask


    oh forgot - 2006 xx - 60K on the clock

    cheers

    Dean
    Last edited by deanneat; 08-02-2019 at 8:22 AM.

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  3. #2

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    Re: Horrible noise from Front Sprocket area

    Clean and lube your chain then adjust.

    STex
    Came into this world with nothing and still have it all.

  4. #3

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    Re: Horrible noise from Front Sprocket area

    As above. Clean it well, pack the rear of the front sprocket with a drop of grease too.

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  6. #4

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    Re: Horrible noise from Front Sprocket area

    sure your chain is ok - does it only happen when moving (not rev related)

    could it be a wheel bearing

    can't think of anything else - not common whatever it is

  7. #5

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    Re: Horrible noise from Front Sprocket area

    When you open the cover take note of the output shaft and sprocket. There is a condition known as brinneling. When you have 2 hardened surfaces contacting under a load it will make an awful racket. As Rocketeer has stated pull the sprocket clean it and the splines then pack the sprocket with grease and reinstall. I use a Moly grease and reload it every 6000 miles when I change oil and clean my K&N air filter. Here is a link to what i suspect you'll see when you pull the cover.

    https://www.cbrxx.com/general-cbr-xx...-sprocket.html
    exxelent likes this.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  8. #6

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    Re: Horrible noise from Front Sprocket area

    I had a similar very ugly noise a couple times over the years. New chain and sprockets took care of it.

    ominousone

  9. #7

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    Re: Horrible noise from Front Sprocket area

    Quote Originally Posted by ominousone View Post
    I had a similar very ugly noise a couple times over the years. New chain and sprockets took care of it.

    ominousone
    Yep! Sounds a lot like a worn front sprocket!

  10. #8

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    Re: Horrible noise from Front Sprocket area

    Might also be a stuffed chain...... try the old press the slack tight and pull the chain link off the rear sprocket trick...... if the link in the middle of the sprocket (like at swingarm height off the ground) moves away from the sprocket while the chain is being held tight, then the chain is worn out....... and so too are both sprockets if they have been on for the duration.

    I've heard guys ride past with their chains & sprockets grinding/graunching/clunking/slapping the swing arm...... what a racket! But they don't seem to hear it while riding. You should have an inch of slack when you test a chain in 6 places...... and not be able to lift that link from the rear sprocket with tension on the chain...... 62K is about right for a hard ridden bike...... I got 100k kms out of my oem chain & sprockets - but I don't get to do big speeds out here (too many licence loosing obstacles or bone breaking wildlife speedbumps ).

  11. #9

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    Re: Horrible noise from Front Sprocket area

    Okeees, update

    I got back from my overseas holiday and popped the rear tyre off to have a look at what the noise was.
    The inner back brake pad wasn't installed properly, they have a slot they sit into, the previous owner didn't quite get it right and it was sitting lower than designed. Not really a noticeable problem until I went for my big ride and used the brakes hard in a few spots, the metal backing of the inner brake pad was scraping the rear wheel. Lets say all fixed now - might check the front ones now to make sure all is good.
    Last edited by deanneat; 08-26-2019 at 10:26 PM.

  12. #10

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    Re: Horrible noise from Front Sprocket area

    oooooops

  13. #11

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    Re: Horrible noise from Front Sprocket area

    Dean
    If it scored the wheel hub you should take a file of piece of steel rod and sand paper and smooth out the gouge. It'll prevent any stress cracks from forming in that area. Then a light coat of paint to keep it preserved.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  14. #12

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    Re: Horrible noise from Front Sprocket area

    Quote Originally Posted by beestoys View Post
    Dean
    If it scored the wheel hub you should take a file of piece of steel rod and sand paper and smooth out the gouge. It'll prevent any stress cracks from forming in that area. Then a light coat of paint to keep it preserved.

    Yeah good idea - might be a good opportunity to colour code the rims


 

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