Brake Adapter Plates for Stock Calipers

I see that many people have adapter better calipers for our bikes and made the appropriate plates to mount them, but has anyone made adapter plates for the stock calipers to work with FZR1000 discs? I have a dual disc setup using stock parts but there is a pulse from the left disc that I have machined out several times but keeps coming back. I have no complaints about the stock calipers' power with a 16mm master, but the pulsing has to go.I already made up adapter rings a few years ago to get the proper offset for the discs, now I need to make plates. I can mock them up with cardboard but I figured I'd see if anyone has a drawing at hand before doing so. Thanks!

That pulse on the left disk maybe the caliper. I had it yesterday on my new disk install came back after shake down. Checked disk was fine on run out but found alot of old loctite and gunk setting the caliper just of alimgmet little bit. Cleaned and filed them all nice flat clean surfaces and shook it down and the pulse was gone.

I have tried to go that route myself, on my RD350, which originally has a 267 mm disc. I was using an early XS disc hub and a custom made 298 mm disc from ISR. But that required the stock caliper to be moved pretty far from the fork, which will look pretty weird IMHO.

Pictures micmac? mine has been working fine for thousands of miles. Converted to the later rotors with spacers a couple years ago. Check that your rotor is near centered in the caliper slot? check the spacers have parallel faces? I've seen some pretty crude looking spacers in the market. One thing to try would be to swap the rotors side to side see if the problem follows the rotor/ spacer. The LH spacing can be a bit of a trick not always the same as the RH.
Would want to confirm the fork tubes aren't tweaked either.

Gary,
Did you replace the discs with some modern discs with the same diameter?
Just used a spacer to correct the disc offset?
Somehow I assumed the OP was regarding using larger discs, and requiring caliper adapter plates as well.

Ok, to be clear, my bike currently has stock XS650 rotors with no spacer. I am going to install 320mm FZR1000 discs. I have the spacers to correct the offset, but I need plates to move the stock Yamaha calipers out to accommodate the increase in disc rotor diameter. Brakes were pulse-free with the single rotor, pulsation only began with the second rotor, which is probably why it was sold to me for so cheap. I have trued the rotor a couple of times on a lathe but it comes back every time. I think the metallurgy is off in that rotor, there are patches of smooth and rough areas on the rotor faces.

Mac,
If it was me, I'd just mock it up, and make the "prototype" bracket from some thin alloy scrap or similar once you are happy with everything, then make them from 10 or 12 mm 6060T6 or better. That is how I made the adapter plate for my Brembo 4 piston caliper

By the way, is the FZR disc wide enough in the swept area for XS calipers/pads?

Go find a set of rotors that FIT. Like in my pics. There's a bunch that do. Fz6rish. Lots simpler. There's even new ones on fleabay bout 150 a pair.

Well, I measured the swept area of the FZR discs and the pad wear path is 1.489" wide. This is from the uttermost disc O.D. to where the rivet washer O.D. for the floating discs begin. This is pretty much exactly the swept area width on the XS rotor, however, there is still about 1/8" outside the wear path, and about another 3/16" inside the wear path of unused surface on the XS. This means the calipers would have to be very accurately placed to get full contact with the disc without fouling the rivets. Probably not doable with a mock up plate. I toyed with reducing the O.D. of the FZR discs, but I would be into the drilled holes by the time the proper OD was met, and the wear path would be way to narrow by then anyhow.