front brake conversion on '83 xs400 seca

[kubus_puchatek]

Hi guys I seem to have a bit of a problem, I want to convert my front brake on my yamaha xs400 seca '83, the problem is that i can not find a disk that is 320mm with a 150mm 6 bolt circle (or I think its 150mm)

(i found a link with discs that are 320mm 80mm 6 bolt circle, http://www.xs400.com/forum/showthread.php?t=5681)

could someone please help with a list over discs that would fit my bike, or post a link to a list with discs that would fit?

 

[redratbike]

Hi,I think these are different from earlier xs models where various aprilia,Ducati and Yamaha discs fit....

 

[XSLeo]

Those look like Seca wheels. My 650 Seca has brake rotors like that. It might be easier to get a different front wheel that uses the other style rotors.
I think they used those wheels and rotors to make a lighter assembly.
Leo