Mot Failed! Warped Discs..
Mot Failed! Warped Discs..
Morning folks...
Froze my fingers off headinginto town this morning to get an mot, all fine bar the front discs are excessively warped..
From searching the forum it appears to be a Firestorm trait!! Any particular reason? I know i hardly use the brakes... i just roll off the throttle!
Been having a search round the internet today. best price appears to be Sandy Bike Spares at £140 for a pair. Considering that's half the price i was quoted by a main dealer this morning, i'm tempted just to jump in there - Anyone had any experience of discs from here?
Froze my fingers off headinginto town this morning to get an mot, all fine bar the front discs are excessively warped..
From searching the forum it appears to be a Firestorm trait!! Any particular reason? I know i hardly use the brakes... i just roll off the throttle!
Been having a search round the internet today. best price appears to be Sandy Bike Spares at £140 for a pair. Considering that's half the price i was quoted by a main dealer this morning, i'm tempted just to jump in there - Anyone had any experience of discs from here?
- rob's red storm
- Posts: 121
- Joined: Sat Aug 21, 2010 9:15 pm
Mot Failed! Warped Discs..
My discs are on the way out as well, just passed the mot with them though! If you find a solution let me know! Strange that the front warp, I'm the same that I mainly use the engine braking. Could be that not enough heat gets into the discs for when they are used hard, so sudden heat generation causes the warping (complete guess!)
- lloydie
- Posts: 20921
- Joined: Mon Jan 17, 2011 11:16 pm
- Location: In the garage somewhere in Coventry
Re: Mot Failed! Warped Discs..
its the same on mine . ebc are good but not cheep ,
when looking for discs all these fit
CBR 600F3 1995-1998
CBR 900RR 1994-1995
CBR 400 RR NC23 NC29
RVF 400 R NC35
VFR 400 R NC30
VFR 750 1994-1997
vtr 1000
when looking for discs all these fit
CBR 600F3 1995-1998
CBR 900RR 1994-1995
CBR 400 RR NC23 NC29
RVF 400 R NC35
VFR 400 R NC30
VFR 750 1994-1997
vtr 1000
Re: Mot Failed! Warped Discs..
It's travelling at warp speed what does it.
It's not falling off, it's an upgrade opportunity.
- LotusSevenMan
- Posts: 1915
- Joined: Wed Sep 06, 2006 8:32 pm
- Location: Liss, Hampshire. UK
Re: Mot Failed! Warped Discs..
I had Suzuki that warped its disc. Had it skimmed for a tenner. Thought that being thinner it'd be worse after a short while, but they took only a small amount off and it was fine for a couple of years before I sold the bike. It was almost as if the heat generated initially warped the disc but the heat 'treatment' allowed it not to warp again!!!!!
Good luck!!!!!
Good luck!!!!!
"Only ride as fast as your guardian angel can fly" !!!
- Road Runner
- Posts: 19
- Joined: Sun Aug 15, 2010 9:45 pm
Re: Mot Failed! Warped Discs..
Dont hold the front brake on when stopped (pressing hot pads onto one part of the disk),
use the back brake to hold the bike if necessary.
use the back brake to hold the bike if necessary.
- rob's red storm
- Posts: 121
- Joined: Sat Aug 21, 2010 9:15 pm
Re: Mot Failed! Warped Discs..
tbh, I never really use the fronts as the engine can do the same job (and sound amazing through the scorpions whilst its at it )
Changed out front wheel bearings today, bearing need replacing on the top yoke as well...ho hum, the list of work goes on and on...
Changed out front wheel bearings today, bearing need replacing on the top yoke as well...ho hum, the list of work goes on and on...
Re: Mot Failed! Warped Discs..
The bobbins may be sticking you can free them up by turning them and a little WD40.
I had a problem with warped discs, and sorted them out like this:
Lift the front wheel of the ground, spin the wheel and find the high point of the run out,
Take a medium size hammer and tw@ the high point, spin the wheel and measure again, if necessary reapply the hammer.
I had a problem with warped discs, and sorted them out like this:
Lift the front wheel of the ground, spin the wheel and find the high point of the run out,
Take a medium size hammer and tw@ the high point, spin the wheel and measure again, if necessary reapply the hammer.
Re: Mot Failed! Warped Discs..
Definitely worth a go; you're only going to throw the old ones away in any case, so you might as well.
I'd suggest a big rubber mallet, though, to avoid dents or dinks.
I'd suggest a big rubber mallet, though, to avoid dents or dinks.
It's not falling off, it's an upgrade opportunity.
Re: Mot Failed! Warped Discs..
tony.mon wrote:Definitely worth a go; you're only going to throw the old ones away in any case, so you might as well.
I'd suggest a big rubber mallet, though, to avoid dents or dinks.
Tony… If it can’t be fixed with a hammer it’s an electrical fault!
Re: Mot Failed! Warped Discs..
I put a 5mm cap head bolt through the hole in the bobbin with a nut either side of the bobbin and wiggled and turned the bobbin and sprayed with WD40 (surprising how much cra* came out) there was over 1.4mm of run out before the hammer and less than 0.2mm after! Service limit was 0.3mm!
This is the bike,but the same appies to the Honda
Hope this helps,
Alan
This is the bike,but the same appies to the Honda
Hope this helps,
Alan
Re: Mot Failed! Warped Discs..
Good tip, but make sure that no wd40 is left in the bobbins- maybe brake cleaner would do just as well.
Oil on disc- that would ruin your day for sure....
Alan, how did you clean your disc rotor and bobbins afterwards?
Oil on disc- that would ruin your day for sure....
Alan, how did you clean your disc rotor and bobbins afterwards?
Last edited by tony.mon on Sat Jan 22, 2011 10:34 pm, edited 1 time in total.
It's not falling off, it's an upgrade opportunity.
Re: Mot Failed! Warped Discs..
Tony, you’re right… the wheel was off for the bobbin treatment and the discs were in the vice. Clean up was with Gunk or break cleaner.tony.mon wrote:Good tip, but make sure that no wd40 is left in the bobbins- maybe brake cleaner would do just as well.
Oil on disc- that would ruin your day for sure....
Alan, how did you clean your afterwards?
Wheels put back on without callipers and the wheel spun and the run-out measured, high point marked with felt pen and clonked with hammer on that mark. Turn again and measure…if more is needed clonk again. The high point will move around the disc as the bobbins hold it in that position.
It worked for me and the Hayabusa did about 6000 miles last year and still got the same discs on!
Alan
- benny hedges
- Posts: 6110
- Joined: Sun Oct 18, 2009 5:09 pm
- Location: Warrington
Re: Mot Failed! Warped Discs..
done that meself and got called a rough butt but it saved me £150 and a retest.alan g wrote:The bobbins may be sticking you can free them up by turning them and a little WD40.
I had a problem with warped discs, and sorted them out like this:
Lift the front wheel of the ground, spin the wheel and find the high point of the run out,
Take a medium size hammer and tw@ the high point, spin the wheel and measure again, if necessary reapply the hammer.
agree on the bobbins - they are supposed to be floating discs. doesnt take much to make them not float
You do not have to say anything. But it may harm your defence if you do not mention when posting something which you later rely on in quote. Anything you do say may be ripped to sh*t.
Re: Mot Failed! Warped Discs..
Well Benny. I was at the point of buying a new set of discs before I gave this a try, nothing to loose really … It worked for me. There must be a lot of discs thrown away that could be used.benny hedges wrote:done that meself and got called a rough butt but it saved me £150 and a retest.alan g wrote:The bobbins may be sticking you can free them up by turning them and a little WD40.
I had a problem with warped discs, and sorted them out like this:
Lift the front wheel of the ground, spin the wheel and find the high point of the run out,
Take a medium size hammer and tw@ the high point, spin the wheel and measure again, if necessary reapply the hammer.
agree on the bobbins - they are supposed to be floating discs. doesnt take much to make them not float