EZ front brake upgrade ‘82 Katana 1000

[cnap504]

Hello, is there an easy front caliper swap for a ‘82 GS1000SZ that improves braking?

[Fazz711]

Any later four pots with adapter plates is a very good improvement 

[cnap504]

Anyone know the diameter of the original GS1000S/GS1100E front discs?  Thanks 

[cnap504]

Got it 275mm.  Are any 320mm discs known to bolt to the original ‘82 GS wheel?

[Slabby11]

Early hounda fireplace discs are the same bolt pattern - there are a number of diameters and offsets so needs a bit of research to get exactly what you need to match the calipers

[Gammaboy]

Because I had wire wheels, none of the 4 pot calipers would fit. I wound up designing a kit that used SV650 calipers and VFR ~296mm discs (I actually used Aprilia RS250 discs for the prototype with the holes slotted 2mm or something). Pretty sure I posted drawings of the adaptor plate. That disc size with the SV calipers lets you use the upper fork mount hole (so the adaptor plate had 3 holes instead of 4) and made a huuuuuge difference in braking compared to the factory shit.

[Gammaboy]

I thought there was another thread, but that shows the setup.

First model VFR800 discs, not VFR750.

[cnap504]

Gammaboy, I looked up SV650 calipers and they look like 4 pots to me, unless I didn’t differentiate between 4 live pistons and 2 live with the back pads applied by the sliding caliper mount.  Thanks for the info

[Gammaboy]

SV650 calipers are 2 pot sliders.