Posted by messenger1 on April 14, 2006, 7:31 am
Greetings all! When I bought my GPz900 it came complete with a set of
prewarped front rotors, which stopped the bike fine, but gave annoying
feedback. I purchased a newsed set off eBay, which were absolutely straight
and well within acceptable limits of wear. I used fresh pads, and my
calipers are in as new condition, both free and smooth.I "broke in" the new
pads and rotors in the same manner I've used on a couple of hundred sets of
pads on my vehicles (messenger, go through a LOT of brakes), progressively
harder stops then let it sit and cool completely. Now, after 5 or 6000
kilometres and a couple of hard stops from triple digit speeds, the newsed
rotors are warped as well. Other than my riding style, (remember I didn't do
the damage to the first set) any suggestions on the cause of this recurring
phenomena?
Also, I read a post somewhere, about "cooking " rotors straight again. Has
anyone ever tried this, and if so what method was used to keep the rotor in
the what position in the oven? On their edge? flat on a piece of steel? On
the grill?
TIA!
Tom B
Posted by George R. Young on April 14, 2006, 9:06 am
> Greetings all! When I bought my GPz900 it came complete with a set of
> prewarped front rotors, which stopped the bike fine, but gave annoying
> feedback. I purchased a newsed set off eBay, which were absolutely
> straight and well within acceptable limits of wear. I used fresh pads,
> and my calipers are in as new condition, both free and smooth.I "broke
> in" the new pads and rotors in the same manner I've used on a couple
> of hundred sets of pads on my vehicles (messenger, go through a LOT of
> brakes), progressively harder stops then let it sit and cool
> completely. Now, after 5 or 6000 kilometres and a couple of hard stops
> from triple digit speeds, the newsed rotors are warped as well. Other
> than my riding style, (remember I didn't do the damage to the first
> set) any suggestions on the cause of this recurring phenomena?
>
> Also, I read a post somewhere, about "cooking " rotors straight again.
> Has anyone ever tried this, and if so what method was used to keep the
> rotor in the what position in the oven? On their edge? flat on a piece
> of steel? On the grill?
>
> TIA!
>
> Tom B
>
>
>
I've seen a write-up about tweaking rotors straight. It involved a dial
gauge and wrenching on the central rotor basket, a bit at a time. Never
tried this myself.
Posted by Mark Hickey on April 14, 2006, 9:27 am
>Now, after 5 or 6000
>kilometres and a couple of hard stops from triple digit speeds, the newsed
>rotors are warped as well. Other than my riding style, (remember I didn't do
>the damage to the first set) any suggestions on the cause of this recurring
>phenomena?
Heat, pure and simple. The rotors didn't expand uniformly, and they
warp as a result. The amount of heat generated is tremendous - all
the energy "stored" in 600 pounds of motorcycle and rider going at
warp speed gets converted to heat in just a few seconds.
>Also, I read a post somewhere, about "cooking " rotors straight again. Has
>anyone ever tried this, and if so what method was used to keep the rotor in
>the what position in the oven? On their edge? flat on a piece of steel? On
>the grill?
Cool idea, if it works. You'd have to get 'em pretty hot, and have
'em on a very flat surface I'd suspect. Maybe in an oven during its
cleaning cycle?
Mark Hickey
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> prewarped front rotors, which stopped the bike fine, but gave annoying
> feedback. I purchased a newsed set off eBay, which were absolutely
> straight and well within acceptable limits of wear. I used fresh pads,
> and my calipers are in as new condition, both free and smooth.I "broke
> in" the new pads and rotors in the same manner I've used on a couple
> of hundred sets of pads on my vehicles (messenger, go through a LOT of
> brakes), progressively harder stops then let it sit and cool
> completely. Now, after 5 or 6000 kilometres and a couple of hard stops
> from triple digit speeds, the newsed rotors are warped as well. Other
> than my riding style, (remember I didn't do the damage to the first
> set) any suggestions on the cause of this recurring phenomena?
>
> Also, I read a post somewhere, about "cooking " rotors straight again.
> Has anyone ever tried this, and if so what method was used to keep the
> rotor in the what position in the oven? On their edge? flat on a piece
> of steel? On the grill?
>
> TIA!
>
> Tom B
>
>
>