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Author Topic: Strange front end noise over bumps "da dink"  (Read 6725 times)

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Offline Chris Liston

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Strange front end noise over bumps "da dink"
« on: May 27, 2005, 12:10:36 PM »
Every once in a while when going over bumps I get this very strange metal to metal  "da dink" noise in my front end.  I've checked everything possible and its all tight and nothings loose.  The only think I think it may possible be is just a front brake pads sliding in the caliper.  But not sure on that.  It only happens everyone in a while over bumps and never anytime else. 

Any insight to possiblities would be great.
« Last Edit: May 27, 2005, 12:12:59 PM by Chris Liston »
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Offline Bob Wessner

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Re: Strange front end noise over bumps "da dink"
« Reply #1 on: May 27, 2005, 12:17:54 PM »
Could be the caliper mounting arm, there is a certain amount of movement there.
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Offline Gordon

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Re: Strange front end noise over bumps "da dink"
« Reply #2 on: May 27, 2005, 12:30:19 PM »
Bob is probably right.  Raul and I discussed this exact same noies a while back and we both decided it had to be the caliper hinge, since that's the only thing on the front end that isn't bolted tight. 
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ztwining

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Re: Strange front end noise over bumps "da dink"
« Reply #3 on: May 27, 2005, 01:09:43 PM »
I saw that old thread the other day and started to chip in, I have that EXACT same sound.  Went through everything like y'all did...then when I redid my fork seal I FINALLY found what it was.  One of the rivets holding my front fender onto the bracket that screws to the fork leg was loose.  The rivet on the top of the fender.  Everything else, including the fender, was tight.  The fender wouldn't budge at all.  But if I just lightly touch/tap that ONE rivet, the rivet itself is loose.  It's really weird how the sound gets so amplified when on the road!

Zac
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Offline Terry in Australia

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Re: Strange front end noise over bumps "da dink"
« Reply #4 on: May 27, 2005, 04:35:06 PM »
I think you guys need a hearing test. Everyone knows that "Da Dink" is loose steering head bearings, sloppy brake calipers make a definate "Da-Donk' noise! Some people refer to it as a "Klonk" noise, but they're misinformed. :D

I had a rattle coming from the front end of my BMW R100RS for years, anyway, I could never find it, one day when I installed new fork seals I found that the damper in the right fork leg was not attached to the bolt in the botom of the leg and was just rattling away, once I took the wheel off the leg just slid off it's fork tube on to my garage floor!

Well I couldn't blame anyone, I had rebuilt these forks a few years earlier, so I guess I was having a "Blonde Moment", ha ha! Cheers, Terry. ;D   
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Offline Raul CB750K1

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Re: Strange front end noise over bumps "da dink"
« Reply #5 on: May 27, 2005, 04:56:28 PM »
I personally rebuilt my front forks and removed and reinstalled the fender, and can bet my remaining testicle that nothing is loose on them. I think it could be the brake caliper, but I don't know.

BTW, I'm removing the carb bowls tomorrow to check if the overflow tubes are blocked or not. For the sake of my future offsprings, I hope they are not...


Raul
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Offline neckyzips

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Re: Strange front end noise over bumps "da dink"
« Reply #6 on: May 27, 2005, 05:09:33 PM »
i have the same noise, i have concluded that it is the fork hitting its stop on full extension, when you go over a bump the front wheel pops up and forks extend to the limit... if the calipers are loose enough to make that noise... no wonder the things wont stop! though it could be stering head bearings, never thought of that?
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CTCStrela

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Re: Strange front end noise over bumps "da dink"
« Reply #7 on: May 27, 2005, 05:11:29 PM »
Sounds stupid, but if the lock is missing on the newer style tank, the fuel door will swing up a bit and make a sound very similar to what you are describing, at least it does on mine (hahaha)..

"ka-klonk"
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Offline Chris Liston

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Re: Strange front end noise over bumps "da dink"
« Reply #8 on: May 28, 2005, 04:44:53 AM »
I'll have to check the fork legs.  I had new seals put in them last year.  The steering head bearing could be the problem.  Time for tapered now I guess.  I know my fender is on tight and brake arm too.  Put them all back on last week after I installed the new exhaust.  Many things to check.  Don't you love old bikes.
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Offline Bob Wessner

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Re: Strange front end noise over bumps "da dink"
« Reply #9 on: May 28, 2005, 05:52:00 AM »
As far as the brake arm goes, it isn't a matter of installing it tightly or not, but there is a certain amount of movement at the hinge pin. Given the amount of mass (arm, caliper, pads, piston, etc.) it takes a fair jolt, but it will move ever so slightly, perhaps making the noise.
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Offline Jonesy

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Re: Strange front end noise over bumps "da dink"
« Reply #10 on: May 28, 2005, 06:10:25 AM »
Quote from: Chris Liston on May 28, 2005, 04:44:53 AM
I'll have to check the fork legs. I had new seals put in them last year. The steering head bearing could be the problem. Time for tapered now I guess. I know my fender is on tight and brake arm too. Put them all back on last week after I installed the new exhaust. Many things to check. Don't you love old bikes.

Set the bike on its center stand and prop the front wheel off the ground. Grasp the forks and try to move them back and forth. If you feel any slop, you'll have to snug up the steering head bearings.

New exhaust...? Hmmm. I know you're sure it's coming from the front, but what kind of exhaust did you install? Sometimes I've seen different pipes allow the center stand to raise up a bit more than intended, relieving enough spring pressure so that it can flop up and down a bit, hitting stuff.

Even though this is probably not your problem, is the chain tightened properly? I had an aftermarket chainguard on mine and even when the chain was tight enough it would slap on the guard if I went over a decent bump or let off on the throttle real fast.

I hope my ramblings are of some help.... :)
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Offline Chris Liston

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Re: Strange front end noise over bumps "da dink"
« Reply #11 on: May 28, 2005, 06:20:43 AM »
The chain and gaurd is good.  new chain, stock gaurd.  It happened before the the new exhaust too.
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Offline Jonesy

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Re: Strange front end noise over bumps "da dink"
« Reply #12 on: May 28, 2005, 06:27:32 AM »
OK, less stuff you need to check, then!
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jsaab2748

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Re: Strange front end noise over bumps "da dink"
« Reply #13 on: May 28, 2005, 06:36:43 AM »
mine does it too, but only when the forks are totally extended (topped out) after a fairly hard jolt. It got more noticeable after I rebuilt the forks with stiffer springs. A k-4 I had thirty years ago did it also under those same conditions. just two cents worth...
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Offline Raul CB750K1

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Re: Strange front end noise over bumps "da dink"
« Reply #14 on: May 28, 2005, 02:32:37 PM »
Today I took my bike for a ride. With the bike on the sidestand, in front of the wheel, took the brake caliper with my right hand and started shaking up and down. That was exactly the sound I hear while on the bike. The hinge pin gives just a slight movement, but it is enough to make it bounce and sound.


Raul
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Offline neckyzips

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Re: Strange front end noise over bumps "da dink"
« Reply #15 on: May 28, 2005, 03:10:43 PM »
hmmm, im going to go try that
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Offline Uncle Ernie

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Re: Strange front end noise over bumps "da dink"
« Reply #16 on: May 28, 2005, 06:42:16 PM »
What neckyzips said. Same thing on one of my bikes. Started after I put in Progressive springs.
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Offline neckyzips

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Re: Strange front end noise over bumps "da dink"
« Reply #17 on: May 28, 2005, 07:00:17 PM »
ok, i was thinking you guys were full of it talking about the brake calipers... but i went and checked them... ok, fine they make a noies, like a cla-clunk, but the noise i have is a cla-clank, just picking, i couldnt duplicate it i still think its in the forks...
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Offline Terry in Australia

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Re: Strange front end noise over bumps "da dink"
« Reply #18 on: May 28, 2005, 07:06:56 PM »
Say what you like, but Da-Dink is definately steering head bearings. Don't try to tighten them, thjey're more than likely damaged, so bin them and replace with tapered rollers.

Oh, and by the way, a loose chain makes a pronounced "Sa-slap" noise, as opposed to the "Kla-Klack" noise the centre stand makes when it rebounds against an aftermarket exhaust, ha ha! Cheers, Terry. (taking the piss)  ;D 
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Offline Gordon

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Re: Strange front end noise over bumps "da dink"
« Reply #19 on: May 28, 2005, 07:12:22 PM »
If you ever hear a tha-thud, stop immediately!

Your woman just fell off.  :P
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Offline Jonesy

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Re: Strange front end noise over bumps "da dink"
« Reply #20 on: May 28, 2005, 07:13:44 PM »
Quote from: Terry in Australia on May 28, 2005, 07:06:56 PM
Oh, and by the way, a loose chain makes a pronounced "Sa-slap" noise, as opposed to the "Kla-Klack" noise the centre stand makes when it rebounds against an aftermarket exhaust, ha ha! Cheers, Terry. (taking the piss) ;D

...You makin' fun of me, Terry??? ;)
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Offline Terry in Australia

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Re: Strange front end noise over bumps "da dink"
« Reply #21 on: May 28, 2005, 07:43:10 PM »
I know when my wife has fallen off the back, that "Nag-nag-nag" noise suddenly goes away, ha ha! Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Quail "Owner of the comfortable k8"

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Re: Strange front end noise over bumps "da dink"
« Reply #22 on: May 28, 2005, 09:35:31 PM »
I had a Jajing Jajing Jajing Jajing rythum noise but I found it was the worn out chain.  I also have a sound in my ears that sounds like frogs singing all the time.  It is a long steady shrill chirp chirp chirp sound. I hope this helps. :) 

 By the way these 2 smileys ;) :-* are a little gay. 

Terry 8) (not Threestones) 
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Offline fergie

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Re: Strange front end noise over bumps "da dink"
« Reply #23 on: May 28, 2005, 10:16:30 PM »
I had  the same sound coming from my front end(or what I thought was my front end)But one day after tightening my drive chain I noticed the sound had gone away.turned out thats all it was a loose drive chain clanking on something.I felt pretty stupid about that one. just try it Chris it can't hurt anything. Cheers, Fergie.
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