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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through April 10, 2004 » Front rotor warpage? « Previous Next »

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Wyckedflesh
Posted on Monday, March 22, 2004 - 06:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

frontside
backside

Had the bike try and toss me off the side yesterday morning at Oh dark hundred, checked the bike out today and this is what I found. Those are the cleanest images of the pics I took to illustrate. The "spotting" on the top pic goes all the way around the rotor. But if you look at the bottom pic the backside of the rotor is perfectly smooth with no such spotting. I jacked the front end off the ground and checked for play in the headbearings, checked tightness of the caliper and rotorbolts. No play anywhere so I am thinking its the rotor. Now I am trying to figure out what caused it to spot on one side but not the other. When I have seen warped rotors in the past, the spoting alternates from one side to the other. I have not seen one that was smooth on one side but spotting on the other...
Ideas? Comments?...and due to moving, taking it to a dealer and have them check is out. It would have to be after I move.
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Buckinfubba
Posted on Monday, March 22, 2004 - 06:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

everyone I have seen that has been ridden to any extent of aggressiveness has had the spots you described.

you would feel the warping if it was warped. lots of vibration and such.

how did the bike try and toss ya.
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Wyckedflesh
Posted on Monday, March 22, 2004 - 06:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Head shook like a bucking bronco. Went past the vibration stage and tried to do a tankslapper. It was showing it slightly the night before, and admittedly I was showing off for a sexy skirt. Took her up through Black canyon to give her a thrill ride and was very aggressive into the corners hot and out hard on the gas two up. A couple times lifting the rearwheel in a low stoppie. After dropping her off I headed home and it felt just a little bit of through the bars of pulsation but not even enough to be concerned with.

Also, that was the top pic was the cleanest pic I had, all the rest are sunblown from glare and I can't photoshop them enough for you to see some of the larger spottings. A few of them are about the diamater of a quarter, and look glazed. But the backside of the toro as I said is perfectly smooth, both to the eye and the fingers.

edited by wyckedflesh on March 22, 2004
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Kcfirebolt
Posted on Monday, March 22, 2004 - 06:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I experienced the same problem during a hard day of riding in Arkansas. The front brake developed a horrible pulse and lost about 30% of its power.

I got home and the mechanic said I had glazed the pads. I took the pads out and took a metal brush and sandpaper to 'em. Seemed to help a little. Put new pads on later and haven't had a problem since.
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Kaudette
Posted on Monday, March 22, 2004 - 06:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have the same 'spots' on my 12's front rotor - no head shake though.

My guess is that going 2-up was the cause of the head shake..??
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Wyckedflesh
Posted on Monday, March 22, 2004 - 06:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I think the combo of two up and real aggressive. I haven't pulled the pads yet, not allowed to here at the apartment and I don't have my storage are where it was allowed anymore. I might see if the manager there will let me since he was real impressed with the fact I kept my space so clean yet did 4 oilchanges and never left a spot on the ground.
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Daves
Posted on Monday, March 22, 2004 - 06:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Looks lots better than my rotor!

Ride to the edge!
Dave
Iowa HD/Buell (Buell Cycle Center)
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Wyckedflesh
Posted on Monday, March 22, 2004 - 06:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

But yours is both sides right Dave? not just the one? See its the one side that is bothering me. If I was seeing the spotting on both then it wouldn't. Most of the XB's I have seent hat have been ridden have the spotting on both sides of the rotor.
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Daves
Posted on Monday, March 22, 2004 - 06:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I'll go look!
Be back soon.

Dave
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Daves
Posted on Monday, March 22, 2004 - 06:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Yep, both sides, hmmmm. I wonder what is going on with yours?
How do your pads look?

Dave
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Wyckedflesh
Posted on Monday, March 22, 2004 - 06:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

When I put the Diablos on the pads looked lightly worn, but that was 1150 miles ago. Admittedly the Diablo's also give the confidence to be aggressive that the dunslops didn't. I will pull the pads as soon as I can though. Maybe just put in a new set regardless to be safe. I realised I do have a spare rotor that isn't being used right now...since the 9R is waiting for the new bodywork and the touch of the saftey wire monster.
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M1combat
Posted on Tuesday, March 23, 2004 - 12:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

My guess is that you were just on the edge of too hot and one side was being cooled better than the other... Got me though. I know my rotor has spots like that. Lemme go check the inside...
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Stot
Posted on Tuesday, March 23, 2004 - 04:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I had a chattering shudder on my front brake a couple of times almost like a mini tank slapper, quite scareyb really. Turned out to be the brake side wheel bearing was fecked. New bearings no more problem. ( cept having to buy 3 bearings as I forgot to put the spacer in. DOH! )

Cya
Stot
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Wyckedflesh
Posted on Monday, March 29, 2004 - 05:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Update: Managed to finally sneak the pads out. The outside pad was half as thick as the inside pad and glazed, while the inside pad had "nice smooth even wear". Roughed up with a wire brush and its working just fine now. Once I get settled after my move I will get new pads and take a scotchbrite wheel to the outside of the rotor and see if I can get rid of the glazed spotting.
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