Front brake switch.

It would be nice if there was some way to measure the diameter of the bore before I fill the system with brake fluid and bleed it. Also I have the parts to make it a double disc at the front.
 
It would be nice if there was some way to measure the diameter of the bore before I fill the system with brake fluid and bleed it. Also I have the parts to make it a double disc at the front.
Operating two calipers will require a different bore size than operating one. The two caliper master cylinder should have a larger bore than that operating one.
 
Actually, it's said that the stock 14mm MC is well suited to operating twin discs. Personally, I don't see the need for them on this bike. A well sorted single disc works good enough I think. With the double disc, you get more connection and possible leak points, along with added weight. And the added weight is unsprung, the worse kind.
 
Operating two calipers will require a different bore size than operating one. The two caliper master cylinder should have a larger bore than that operating one.
Are you sure? Because in 1979 I bought a new Kawasaki Z1000 (UK) and that had a double hight master cylinder brake fluid reservoir to account for the extra disc and brake fluid required.
 
@Trevor9, I am very sure. Below is a ratio chart from MMM's Vintage Brake site.

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