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Old 08-12-2012, 05:08 PM   #1
Chicken Strips
oldmanriver's Avatar
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Joined: Jul 2009
From: Battle Ground, WA.

I Ride: 1980 Yamaha XS1100LG 1991 Honda CBR1000F
Unhappy Need to tame it down i guess!!
Guess i just have to slow it down. Have two bent rotors, (yes i said bent, not warped) The tire wear combined with my excessive use of my brakes are taking a toll that i can't afford. Guess i'll resort to riding it like it was intended. [B]"BORING"[/B. Have my front tire mounted, and now to tackle my rear, but not before Tuesday night coffee. Maybe somebody needs to show me how to ride without using my brakes. I know, i'll just take my calipers off. Found 2 used rotors off my XS1100 forum for $65.00 shipped. New ones are $225.00 each, so the used are a good deal.

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Old 08-12-2012, 05:22 PM   #2
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Joined: Dec 2011
From: Spokane Valley

I Ride: 2010 KTM 690smc, YZ250, CR125, 99' ///M3
hmmm i beat the hell out of my 83 xj750 and its flawless.

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Old 08-12-2012, 07:59 PM   #3
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Joined: May 2012
From: Ridgefield WA
how do you bent a rotor.. too much pressure?

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Old 08-12-2012, 08:04 PM   #4
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Joined: Apr 2008
From: Vancouver, WA

I Ride: Versys 650
Damn. That sucks.

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Old 08-12-2012, 08:06 PM   #5
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Joined: May 2011
From: LaCenter, WA

I Ride: 2003 Copper SV1K
BOB!!! We need to get you a newer bike lol!

I also wanna know, how the hell do you bend rotors without mashing something else up?

Got a nice Katana in the shop that could use a new owner.....

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Old 08-12-2012, 08:48 PM   #6
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Joined: Oct 2005
From: CENTRAL

I Ride: When I can
“ Quote:
Originally Posted by RedKat600 View Post
BOB!!! We need to get you a newer bike lol!

I also wanna know, how the hell do you bend rotors without mashing something else up?

Got a nice Katana in the shop that could use a new owner.....
I wanna know too! Other than crashing how did you bend both?

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Old 08-12-2012, 09:55 PM   #7
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Joined: Oct 2009
From: Vancouver USA

I Ride: one speed............
Are you sure the person who changed your tire didnt bend the rotors? I can not see any way that tire wear or hard braking can possible bend a rotor, thats just hogwash.

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Old 08-13-2012, 02:52 AM   #8
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Joined: Jul 2009
From: Battle Ground, WA.

I Ride: 1980 Yamaha XS1100LG 1991 Honda CBR1000F
I have been reading a considerable amount on this, and these stainless rotors are notorious for bending when they cool after being used hard. They have been hot enough to have nice blued rings on both rotors.This sounds like it should be a warp, but it is only one spot on both rotors. I would think that it could be a wheel, but the bend is different on both rotors. I'll live with them for awhile, and get some different ones.

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Old 08-13-2012, 03:35 AM   #9
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Joined: Apr 2006
From: Tri-Cities, WA

I Ride: Hither, Thither and Yon ... mostly day rides
“ Quote:
Originally Posted by RedKat600 View Post
BOB!!! We need to get you a newer bike lol! .


compared to the 1980 vintage bikes, new ones all have:
fabulous brakes, bright headlights, have lost a hundred pounds, have twice the power, same gas mileage and same lousy horn..

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Old 08-13-2012, 04:25 AM   #10
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Joined: Oct 2005
From: CENTRAL

I Ride: When I can
“ Quote:
Originally Posted by Jason D View Post
Are you sure the person who changed your tire didnt bend the rotors? I can not see any way that tire wear or hard braking can possible bend a rotor, thats just hogwash.
I'd be looking for some marks on your rotors where a tire bar or levers bent the rotors. They don't bend due to heat. I've discolored a set. But never bent a rotor.

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Old 08-13-2012, 05:58 AM   #11
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Joined: Jul 2009
From: Battle Ground, WA.

I Ride: 1980 Yamaha XS1100LG 1991 Honda CBR1000F
If they were bent from tire mounting, then i am the person responsible. I have mounted the last two tires. The pulsing has gotten a lot worse over the last year, so i doubt it was from something like that. Have none of you ever had rotors warp and tweak on your car from braking hard for a period of time, heating the rotors? Stainless is one of the more susceptible metals to warping and bending because of heat. I will say that i have had what i thought was calipers hanging up for quite awhile, but now i wonder if the warp is what i was feeling.

[B]Brake rotors are very susceptible to excessive heat, especially heat related to excessive brake pad friction. If brake rotors are exposed to excessive heat levels for a prolonged period of time, they can become warped and damaged.

Brake calipers are responsible for squeezing brake pads against spinning brake rotors, a process that produces a vehicle's braking action. Malfunctioning brake calipers can apply abnormal amounts of squeezing action over time, a condition that can seriously warp a set of brake rotors.


The problem I have and this is the second time it has happened,
(1st time covered under warranty) the front rotors seem to have warped again. I have about 14.000 miles on the bike and never over use the front brakes to the point of heating them up. This is pissing me off as my local dealer is no help and will not replace them. When I apply the front brakes the bike pulses like crazy. This really sucks at slower speeds. I have heard that other people with this bike have had the same problem, but never found out what the final result for fixing the problem was.
I am convinced that the overall surface area of the rotor is not sufficient enough to handle the weight of the bike.
I would love to change them out for beefier rotors but that would mean changing out the wheels, as they are cut to match the spread out pattern of the rim, and do not mount like normal rotors.
Short of never using my front brakes, can any of you gurus give me suggestions as to what may be causing this, or know or any rotors that may fit. Thanks for the help



Just a small taste of what i have been reading. There is also the possibility of pad material being transfered to the rotor, but tried Ron's idea on that , but didn't work. I am going to see i can find a machine shop that is willing to try to grind them a little, but first i need a dial indicator to measure just how much warpage, or bend there is.

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Old 08-13-2012, 06:11 AM   #12
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Joined: Sep 2005
From: Bremerton

I Ride: 07 XB12Scg, 03 Are See fiddy one, 05 DRZ470SM, 95 FZR1040, 69 Combat Commando Roadster, 73 Commando Interstate, 67 BSA B44, 71 BSA B50
How do you know that they are bent/warped????
Have you measured the runout with a dial indicator or are you just assuming that they MUST be warped because they pulse?
Pulseing is also caused by hard spots in the metal. Stainless in particular.
Measure the runout and get back to us.
I seriously doubt you've bent/warped anything.

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Old 08-13-2012, 06:32 AM   #13
Chicken Strips
 
Joined: Nov 2007
From: Vancouver, WA

I Ride: 00 XR650R, 05 DL1000, 14 DL1000
“ Quote:
Originally Posted by dragracer1951 View Post
How do you know that they are bent/warped????
Have you measured the runout with a dial indicator or are you just assuming that they MUST be warped because they pulse?
Pulseing is also caused by hard spots in the metal. Stainless in particular.
Measure the runout and get back to us.
I seriously doubt you've bent/warped anything.

Listen to this guy. He knows his stuff.

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Old 08-13-2012, 06:47 AM   #14
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Joined: Feb 2012
From: Lynnwood, WA

I Ride: 1998 CBR900rr for the street and 2007 CBR600rr for the track
“ Quote:
Originally Posted by oldmanriver View Post
(yes i said bent, not warped)
This is where the confusion is, youre describing conditions that might warp a rotor under extremes, but saying theyre bent...

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Old 08-15-2012, 08:41 PM   #15
Chicken Strips
oldmanriver's Avatar
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Joined: Jul 2009
From: Battle Ground, WA.

I Ride: 1980 Yamaha XS1100LG 1991 Honda CBR1000F
You may not believe this, but it was the mounting bolts for the calipers being bent. This bike has only one mounting bolt running through it. Evidently it was bent on both calipers. How it was forcing what was happening, i don't have a clue. One of the guys on our XS11 forum mentioned the bolts, and that is what the problem was. This is an old bike, and has very little in common with the sport bikes, other than having two wheels, so some of this stuff has to go to the old guys that have been around these old bikes.

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Old 08-15-2012, 09:00 PM   #16
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Joined: May 2011
From: LaCenter, WA

I Ride: 2003 Copper SV1K
If the caliper was cocked funny, that would explain the issues you were having. Are the rotors still confirmed bent/warped or was it just the calipers?

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Old 08-16-2012, 05:14 AM   #17
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Joined: Jul 2009
From: Battle Ground, WA.

I Ride: 1980 Yamaha XS1100LG 1991 Honda CBR1000F
Have not measured them again, but it feels like it is gone. The bolts must have been putting those calipers in a torqued state.

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