Front master cylinder questions

[remmy1101]

What are you guys using? do many dirtbike master cylinders fit the bill? I noticed theres a local one for sale for a cr125 seems like it would work does anyone know?

 

[XSLeo]

What is the bore size? If it is the same as the one you have, then it will work the same. If it is 2 mm smaller, the lever will pull a bit farther but it will make the brake more powerful.