Topic: Bore Size Master Cylinder ?

[rddcw]

Trying to find out what the STOCK bore size of the Master Cylinder on my 74' CB 750 K4 ?  I'm going to add a 2nd disc up front ( dual disc brake set-up ) and should I use a bigger bore M/C for Better braking performance ? I'm only guessing that the stock M/C is 14mm and need to use a 16mm ?  Can't seem to find an answer to this question anywhere ?

[robvangulik]

Stock size is 14mm, and it will work fine with dual disks, in fact a single disc works better with
 ½inch (12.7mm).

[rddcw]

Interesting, do they even make a 1/2" M/C ?

[robvangulik]

And 11mm , 5/8 inch(15.8mm) 17 and 19mm. Don't expect to buy all those from Honda, but even they use different sizes on different bikes.

[rddcw]

Where are you sourcing these M/C's ?  I'm sure there are motorcycle applications that used them ?

[flybox1]

Where are you sourcing these M/C's ?  I'm sure there are motorcycle applications that used them ?

https://www.davidsilverspares.com/CB750K4-FOUR-1974-USA/part_123914/

[robvangulik]

Where are you sourcing these M/C's ?  I'm sure there are motorcycle applications that used them ?

Google is your friend, type 'master brakecylinder XXmm'. and make your choice from the list...