Twinpot Brake upgrade on 78 Skunk

[salty_monk]

Pm back. Those Rotors look right. The RR ones you need to check Dia - some RR ones are larger dia than 296mm. If you are buying new get the ones with the 78mm PCD / BCD rather than 76mm, that way you only have to enlarge the holes to 8mm rather than re-drill between existing.

The spacer also acts as a drilling jig (bolt it to two existing 6mm holes using shoulder bolts & drill the 8mm straight through - with a drill press is best).

Thanks for the quick reply! PM'd you about the brackets.

Will the following rotors work on my 85 GS550E? If so which would be recommended? I don't know if one is superior to the others in performance or if they're pretty much the same.

And I just want to confirm, but I'll be set for the upgrade with a pair of rotors, the bracket/spacer set, and a pair of calibers right? Assuming the brackets you have are steel which means I can use the original mounting bolts.

Thanks for the help!

CBR600F3:

http://www.ebay.com/itm/Honda-CBR600-CBR-600-F3-Front-Brake-Rotors-95-98-/251832488803?pt=Motorcycles_Parts_Accessories&hash=item3aa262d363&vxp=mtr

http://www.ebay.com/itm/Front-Brake-Disc-Rotor-for-Honda-CBR600F-CBR-600-F3-1995-1998-CBR900RR-1994-1997-/311211386068?pt=Motorcycles_Parts_Accessories&fits=Model%3ACBR900RR&hash=item4875a4e4d4&vxp=mtr

http://www.ebay.com/itm/Round-Front-Brake-Disc-Rotors-For-Honda-CBR600-F3-1995-1998-CBR-900-RR-1994-1997-/261656934029?pt=Motorcycles_Parts_Accessories&fits=Model%3ACBR900RR&hash=item3cebf7f68d&vxp=mtr

CBR900RR:

http://www.ebay.com/itm/1-set-Front-Brake-Disc-Rotor-FIT-Honda-CBR900RR-1994-1997-/171519541143?pt=Motorcycles_Parts_Accessories&hash=item27ef5c7f97&vxp=mtr

[salty_monk]

Yes to brackets available.
Yes those calipers will work.
Yes you are correct on the 296mm rotor size.
You will need to do the rotors at the same time. The only other option is to use two rotors from a GS single rotor model such as the older GS550E or GS1000C etc. Those are 295mm & work fine but are very heavy...

Are there any mounting brackets left?

I have an '85 GS550E which has dual rotors. I'd like to upgrade the calipers now and hold onto the spacer so that I can upgrade the rotors at a later time if I need to.
The rotor diameter of a CBR900RR is 296 mm according to http://metalgear.com.au/, however the diameter of my rotors is 260 mm from the same source. Will this kit still work? Do I need to get new rotors at the same time?

From metalgear.com.au for 1985 GS550E:
Outside Diameter: 260
BCD: 78
Thickness:5.0
Offset:21.5

Also, will the following calipers work?
From a 750:

http://www.ebay.com/itm/89-Kawasaki-ZX-750-7-ZX7-ZX750-F-Ninja-front-brake-calipers-right-left-/310911736314?pt=Motorcycles_Parts_Accessories&hash=item4863c899fa

http://www.ebay.com/itm/89-Kawasaki-Ninja-ZX-750-R-GPX-Front-Brake-Calipers-W-Lines-KH-/130880116077?pt=Motorcycles_Parts_Accessories&hash=item1e7910156d

From a 600:

http://www.ebay.com/itm/1989-Kawasaki-ZX6-ZX600-600-ninja-front-brake-calipers-/291182949845?pt=Motorcycles_Parts_Accessories&hash=item43cbdb35d5

http://www.ebay.com/itm/1989-Kawasaki-ZX6-ZX600-600-ninja-front-brake-calipers-/321684387443?pt=Motorcycles_Parts_Accessories&hash=item4ae5e23673

Thanks

[salty_monk]

One back to you!