[krishnag]

Hi,
I am trying to replace the Master cylinders for my bike CF MOTO V5 250cc 2010 model. The original CF moto replacements cost me $600 including fitting. So trying to find any Universal Master cylinders and got stuck with the Bore size. I got no idea of what is it and how to measure.
Can any one help me with this.
thank you,
Krishna

[NMKawierider]

If you pull the plunger out you can measure the bore diameter and then debth. But..I wouldn't worry too much about that- just get one for a bike as heavy or heavier then yours and you will be fine. Its OK to have one too big, it just takes less pressure to stop. Too small and you will have to pull pretty hard on the lever.  And you want it to fit the bar with the handle and line in the right place.

[Cosmosdan]

Hi there. Try posting in the general or how to tread. You might get more answers. As far as measuring. I'm not sure what your after. The bore can be measured with a caliper or if you don't need to be exact you can try a steel rule.