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Old January 11th, 2013, 11:01 PM   #1
krolinked
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Which Master Cylinder should i get?

So I've tried to get an easier pull on my lever for ninja 250 by replacing stock with an R6 master cylinder. It was almost impossible to squeeze and downright dangerous, with very very little lever travel. Im guessing its because the leverage was changed in the wrong direction? Which lever should i get if I Want:



Lever to pull closer to bar, but be easier to pull?


Does this make sense, Im not sure how to explain it.
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Old January 11th, 2013, 11:45 PM   #2
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Look here for my update this weekend http://www.ninjette.org/forums/showthread.php?p=617484

I've tied 4 masters of all different sizes.
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Old January 12th, 2013, 05:44 AM   #3
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I think the mc is too big, and the volume of fluid is too large for the stock brake calipers.
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Old January 12th, 2013, 10:32 AM   #4
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When looking at m/c setups, the relationship between the combined area of the caliper pistons and m/c pistons will have a drastic effect on feel. When using the stock caliper, a m/c replacement should be close to the piston diameter of the stock m/c.
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Old January 12th, 2013, 10:41 AM   #5
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Originally Posted by sharky nrk View Post
When looking at m/c setups, the relationship between the combined area of the caliper pistons and m/c pistons will have a drastic effect on feel. When using the stock caliper, a m/c replacement should be close to the piston diameter of the stock m/c.


by the way does anyone know what the piston size is on our stock Master cylinder?
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Old January 12th, 2013, 10:51 AM   #6
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From everything I've read, I think you'd probably want a 18x16 Radial or 12mm Axial MC.
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Old January 12th, 2013, 11:14 AM   #7
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From everything I've read, I think you'd probably want a 18x16 Radial or 12mm Axial MC.
18x16 radial is to big, I've got a 16x18 paired with my 4 Piston R6 caliper and it seems to be the perfect balance if still a bit on the stiff side. The ninja 250 caliper is 2 piston and they're smaller then the R6 pistons and estimate the surface area of the 250 is 40% of the R6. I'd estimate a 12-13 radial piston MC is needed but good luck figuring out what bike that comes on as it's OEM because I'm not sure where else your going to find it.
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Old January 12th, 2013, 01:01 PM   #8
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what was wrong with the oem mc anyway? still too hard?? i find its not difficult to lock up the front with the stocker MC and cheap double H pads.
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