Topic: rotor resurfacing safety question - CB750

[nomad]

I've dug up threads here from people discussing them having their rotors resurfaced.  So I called the local Honda dealership to see if they'd do it.  In short, they said no.  I'm guessing for safety/ legal reasons.  Not being "up" on this, I just took them at their word and said thanks.

So, what if any issues are there associated with getting the front rotor of a 750 resurfaced (even a small amount)?  I'm about to get it drilled by a fellow forum member and am thinking of having this done first.  I'm sure it really isn't necessary in my case seeing as how I have only very minor pitting and grooving, but I thought it might be nice to get it back to that "new" look since I'm going trhough the effort to make the rest of it nice and "sparkly." 

What are y'all's thoughts and who does this type of work (and is good at it)?

[lordmoonpie]

I presume you mean dressing the existing surface rather than building it up with something? Issue of dressing the surface will purely be to make sure it's done flat and not too much taken off to take the rotor below serviceable limits. I wouldn't think there's any merit in adding material and dressing back to get a decent finish, that surely would give you issues of separation, warping and goodness knows what else.

Take the rotor off altogether and get a good machine shop to cut you a slice of cast iron, drill and finish that and add it to the internal carrier - you'll have instantly better stopping power. Or, send your disc to CAT Engineering in the UK and Len will do it all for you 

[flybox1]

a few over here offering this service....
http://forums.sohc4.net/index.php?board=50.0
it should be done AFTER any cross drilling/chamferring to get rid of burrs.

had mine done for my 350F.  speedracer741 did it, but dont know if he's around much anymore.
drilled, chamferred and resurfaced. best $80 (incl. shipping) ive spent on my bike.

[Kong]

I took two of them (550 rotors) to a local mechanic's shop a couple of weeks ago, he tossed them in the brake lath (Snap On) and turned them both, both sides, no problem.  Measured thickness after turning was still far in excess of the 6mm (I think it was) minimum thickness.  So I don't know why your dealership couldn't, or wouldn't do it, but mine are like new now.

[MCRider]

Frankly, I can't imagine a dealership having the tools to do it. Its a relatively low volume, generally unnecessary request, IMO.

Though for those of us who want it (I had mine done at a shop in Chicago) its a neat thing, necessary doesn't enter in.

[mystic_1]

So I called the local Honda dealership to see if they'd do it.  In short, they said no.  I'm guessing for safety/ legal reasons. 

Nah, the usual attitude at dealerships is "Why are you messing around with that old bike?  Buy a new one from us!"

In short, they don't consider such work to be worth their time on bikes that are no longer in warranty, and on the newer bikes it's faster (and therefore cheaper to them) to just throw a new rotor on.

mystic_1

[Stev-o]

Dealer probably doesn't have a lathe, they would rather sell you a new rotor.

We always called it "getting rotors turned".

[george]

Dealer probably doesn't have a lathe, they would rather sell you a new rotor.

We always called it "getting rotors turned".

That's something I remember from hangin out at the 66 Station as a youngster, after those rotors had been machined (turned) they look new! After working in Auto parts recently, I discovered our rotors can be cleaned up if the machinist will treat them like a flywheel. They just have to cut one side at a time. A 6mm rotor is too narrow to do both sides at once, Accurately, or so I have been told.

[754]

 About 4 out of 5 rotors will clean up easily by blocksandinng them in a lathe..