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post #1 of 7 (permalink) Old 04-01-2008, 01:25 PM Thread Starter
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front end chatter

hello, i've not posted here in a very long time, but was hoping i could get some answers. I have begun to experience some chatter from the front end while out at the track. We adjusted the preload on the forks to make sure they were not bottoming out, and I checked the front brake pads, and they look like they still have plenty left.

However, i have 23000 miles on the bike, and have never replaced the brake pads. Should i anyway in hopes that this will solve the problem? Before my last trackday I had also installed braided lines, with dot4 fluid.

BTW, this is an 06 ZX6R im talking about here...anyone have any educated ideas on how to fix this problem?

if i need to spill more info, let me know cause i just kinda spat out some random stuff...

Tristan
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post #2 of 7 (permalink) Old 04-02-2008, 12:37 PM
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Originally Posted by Stan_James View Post
hello, i've not posted here in a very long time, but was hoping i could get some answers. I have begun to experience some chatter from the front end while out at the track. We adjusted the preload on the forks to make sure they were not bottoming out, and I checked the front brake pads, and they look like they still have plenty left.

However, i have 23000 miles on the bike, and have never replaced the brake pads. Should i anyway in hopes that this will solve the problem? Before my last trackday I had also installed braided lines, with dot4 fluid.

BTW, this is an 06 ZX6R im talking about here...anyone have any educated ideas on how to fix this problem?

if i need to spill more info, let me know cause i just kinda spat out some random stuff...
Well, there are alot of reasons that could happen. You could actually be hopping the rear and thinking it's the front, your front pads may be slightly glazed-over, or it very could possibly be that your rotors are warped, or out of alignment. If I were you, I would put the bike on a front stand and spin the front wheel to see if the rotors are warped. I hope this helps you.

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post #3 of 7 (permalink) Old 04-02-2008, 07:21 PM
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Have you checked the the big nut that connects the trees to the frame. Sorry the technical term has skipped my mind. Also check the bearings inside the neck. Are your tires wearing unevenly or cupping?

When does this problem happen?
While cornering? On Power? Off power? During braking? Going straight?
Can you repeat the situation?

All little clues to tell you where to start looking and help us help you diagnose the problem.

Good luck and I think you have asked the right group of guys!

2000 GSXR-750

"Just because you can do it doesn't make it a good idea"

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post #4 of 7 (permalink) Old 04-02-2008, 08:59 PM Thread Starter
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It happens when I'm on the brakes. Maybe the front tire is cupping from too low of pressure? I was running 30 psi cold in the front on dunlop qualifiers.

I'll have to mess around and see if it will do it on the street when I have normal tire pressure in.

Tristan
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post #5 of 7 (permalink) Old 04-03-2008, 03:33 PM
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When your hard on the brakes there is alot of pressure on your front end. Starting with your steering head bearing (afore mentioned nut on the upper triple clamp), triple clamps themselves, forks, brakes, front axle and tire. Chatter while straight up and down usually comes from warped brake rotors or maybe glazed pads skipping on the surface, since the load on your triple clamp and steering head stays pretty linear.

Sitting still hold your front brake and rock the bike back and forth, pushing up and down on the steering head/triple clamps. Hear any slack or popping? No then put it on someones front stand and grasp the fork legs from the bottom and see if there is any play? No? that eliminates the steering head and triple clamps.

Check your caliper bolts and axle to ensure they aren't loose.

Check for warped rotors by spinning them and looking for any wavy pattern.

Check your brake pads themselves to se if they look glassy or glazed. If they are light sand paper should bring them back.

After that look at your front suspension adjustment. You said the preload is set right and it doesn't bottom (use a zip tie around the fork to check after a ride) Rebound Damping degrades over time and serious abuse so you may have to turn it up some. Fork oil also gets dirty and sticky and needs to be changed for proper damping effect.

All that good then you just need to get a friend to watch you enter the corner and look for rear wheel hop. Walk the track and see if that corner has tiny imperfections that would upset your suspension.

My 2005 ZX6R came off the showroom with loose steering head bearings. Your owners manual would have you checking into brake pad wear and fork oil maintenance by 23000 mi. Test and tune!

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post #6 of 7 (permalink) Old 04-04-2008, 12:11 PM Thread Starter
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ahaa...i believe you have just explained that popping noise i get sometimes when i stand the bike up. I'm going to check it with a buddies front stand later, but there does seem to be some slack in the steering stem area

Tristan
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post #7 of 7 (permalink) Old 04-08-2008, 10:10 PM
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Originally Posted by smileyman View Post
When your hard on the brakes there is alot of pressure on your front end. Starting with your steering head bearing (afore mentioned nut on the upper triple clamp), triple clamps themselves, forks, brakes, front axle and tire. Chatter while straight up and down usually comes from warped brake rotors or maybe glazed pads skipping on the surface, since the load on your triple clamp and steering head stays pretty linear.

Sitting still hold your front brake and rock the bike back and forth, pushing up and down on the steering head/triple clamps. Hear any slack or popping? No then put it on someones front stand and grasp the fork legs from the bottom and see if there is any play? No? that eliminates the steering head and triple clamps.

Check your caliper bolts and axle to ensure they aren't loose.

Check for warped rotors by spinning them and looking for any wavy pattern.

Check your brake pads themselves to se if they look glassy or glazed. If they are light sand paper should bring them back.

After that look at your front suspension adjustment. You said the preload is set right and it doesn't bottom (use a zip tie around the fork to check after a ride) Rebound Damping degrades over time and serious abuse so you may have to turn it up some. Fork oil also gets dirty and sticky and needs to be changed for proper damping effect.

All that good then you just need to get a friend to watch you enter the corner and look for rear wheel hop. Walk the track and see if that corner has tiny imperfections that would upset your suspension.

My 2005 ZX6R came off the showroom with loose steering head bearings. Your owners manual would have you checking into brake pad wear and fork oil maintenance by 23000 mi. Test and tune!
Great Post! Looks like he came to the right place!

2000 GSXR-750

"Just because you can do it doesn't make it a good idea"

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