Rotors resurfacing/skimming - who does it

[psyguy]

Does anyone know a place in auckland where i can have the brake rotors skimmed?

Guys that do cars' rotors cant do motorbikes'.

Couple of machine shops said they could do it but would get expensive as they dont have the exact machine for the job.

Motorbike garages were not helpful either - recomended "buy a new one".

At $500 for a new pair, there must be a cheaper way to fix a slight warp, no?

On a web forum i learnt that it can be done and cost only US$40 per disc, well thats if you live in the usa...

The service manual i have suggests the same, but it is 30 y/o and maybe these days no one expects bikes to last that long

thanks

[Crasherfromwayback]

The problem you have now mate is it's near impossible to get a wof if the discs are below the min thickness stamped on the disc. Chances are, if it's an old disc anyway, you'll not be able to skim it and still have it thick enough to get a wof.

[imdying]

$500 is peanuts, don't be such a tight bastard. Motocycle discs almost exclusively have a 1mm wear tolerance, how much to you think will be left once they're done?

[vifferman]

Yeah, what they said.
You might be able to find some good secondhand ones that will fit your bike. I did this with my VF500 when I was in the same situation as you: went to a brake place and they said bike disks couldn't be skimmed. It turned out that NS250 disks were the same diameter and had the same mounting holes, so at the second wrecker I went to he sorted through his stock until we found some that weren't warped.
I would think that maybe some other Suzuki disks from the same era as your GS might bolt straight up.

[F5 Dave]

Precision grinders in wgtn do it, but how thick are they is the first question.

Is a bit of a job, best done on a magnetic table the trick is not to hold them with so much power that they are pulled flatish & then skimmed, then put on the other way & skimmed, could end up with wavy thickness discs. They hate floating discs if can't disassemble, but old style GS discs should be ok

Really it's often only a patch & they warp again, or get so thin miss the next WOF anyways.

Check out the aftermarket, just avoid NZ made as they aren't that hot. EBC & Galfer will be a better bet.

[FROSTY:Me]

I'd be hunting down some sutable second hand disks--eg GSthou Gs650 and gs1100g all come to mind

[psyguy]

thanks for the prompt replies guys

the discs are actually quite thick at 4.9mm or so (5mm when new) and the servicable limit is 4.5mm so i thought they could go through the machine once
maybe i was wrong

yes, theres plenty of used discs available as many gs models over many years used the same discs but i though skimming mine would make them better than what i would get second hand
maybe wrong here too

as for the new aftermarket discs, do you know if they are any better in quality than the oem? so the price could be justified because of that?
no point in spending all that money and warping them on the first ride

[F5 Dave]

Better quality? Good brands like EBC etc should be the equal of &/or depending on the model ie: if you went for an upgrade, better than stock.

On the other hand cheap knock out brands are like a box of chocolates. Old ones. Left in the sun. You might get lucky, but . .