Brake rotor resurfacing.

[Galactica]

So, my CB750K5 is a pretty nice runner.  But it doesn’t stop at all well.  Actually kinda scary.  I’ve replaced/rebuilt the front brake from top to bottom.  Except for the rotor.  It’s actually quite scored.  I don’t have any experience with how much braking would be improved by resurfacing or replacing the rotor. 

In your considered opinion, would braking be significantly improved by resurfacing or replacing/replacing the rotor.  I can get an aftermarket rotor for $328.30.  My understanding is that, because the configuration of these old motorcycle rotors, it’s difficult to turn them.

[Galactica]

Posted this in another thread as well:

Damn the torpedos.  I did a bit of reading about resurfacing these rotors.  It seems you only get about 20 thou to remove from each side.  And because of the hard stainless material, it’s recommended to grind rather than turn.  So I bit the bullet and ordered a new rotor.  Could have saved some $ by ordering through the US and shipping to a US address.  But considering current border issues, the ship $ saved wouldn’t be worth the hassle.  And I’ll have it in hand from the Ontario supplier early next week.

[Galactica]

When I get the new rotor installed, and weather permits a ride, I’ll be able to report differences, if any, in braking performance between old and new.

[hardrockminer]

Was the rotor worn below the acceptable limit?  I've never found one that was worn that badly.

[Galactica]

Tons of material available for removal.  Original thickness is 7mm and despite the grooves, that’s what it still is.  Minimum thickness is 6mm.  So lots of room.  By all accounts though it should probably be ground on something like a flywheel grinder.  Apparently, because of the hardness of the stainless steel, a lathe can tend to chatter, and the tools must be really sharp and won’t stay sharp very long. 

In any case, I have a new aftermarket rotor en route.

[Twisted_Twin]

Ross,

The last ones I cut for you were done on a lathe. Stainless wasn't a problem and the lathe has pucks that ride on the disc to stop any chatter.

[Bucko]

Our buddy Murry at Modern used to grind rotors - not sure if that's still the case or not. 

[Galactica]

Our buddy Murry at Modern used to grind rotors - not sure if that's still the case or not. 

Hey Dave,

Did you sell any of your bikes?