Front brake master cylinder piston size

old3 · November 16th, 2012, 03:20 PM

Anybody know the diameter? I'm working on my 2013 300, which looks to have an identical brake system to the 12 250, and have gotten as far as the stock master/caliper will take me.

SS line, DOT 4 and HH pads, far better than stock but I need a 3 finger pull to really put some pressure on it. I'd like to get that to a 2 finger pull, or 1 if possible.

I've read the thread about the ZX6 master install and it dosen't really get into the final feel of the brakes. I've been riding alot of supermoto the past 6-7 years and know i want that level of power, just gotta find the best way to get it and I think a smaller master cylinder piston diameter will get me close.

If anyone has info on a good donor for a 4 piston caliper too please advise!

Thanks!

k-os · November 16th, 2012, 03:33 PM

I'd think a larger diameter MC piston would get you a quicker bite.

dino74 · November 16th, 2012, 03:36 PM

I think stock Ninja 250 is either 13mm or 12.7mm. I'd guess a radial 16x18 or axial 12mm master cylinder would be what you want.

old3 · November 16th, 2012, 03:39 PM

Hmmm, from what I've gleaned a smaller piston in the master or a larger piston in the caliper will accomplish this. I'm hoping to find a rider who has achived the lower effort/higher power at the lever that I want. I've had an oversized master that left my lever feeling wooden, not what I want.

I know I can use my whole hand

but I'm coming off a KTM 950 SMR with full radial Brembos and my 530 with sumoto wheels and 320mm rotor and want to get a close to that as I can.

Anyone ever put a bigger rotor on a 250 with a caliper relocator? 320mm maybe?

November 16th, 2012, 03:20 PM	#1
old3 ninjette.org sage Name: Jim Location: NJ Join Date: Nov 2012 Motorcycle(s): Ninja 300, KTM EXC610SMR Posts: 913	Front brake master cylinder piston size Anybody know the diameter? I'm working on my 2013 300, which looks to have an identical brake system to the 12 250, and have gotten as far as the stock master/caliper will take me. SS line, DOT 4 and HH pads, far better than stock but I need a 3 finger pull to really put some pressure on it. I'd like to get that to a 2 finger pull, or 1 if possible. I've read the thread about the ZX6 master install and it dosen't really get into the final feel of the brakes. I've been riding alot of supermoto the past 6-7 years and know i want that level of power, just gotta find the best way to get it and I think a smaller master cylinder piston diameter will get me close. If anyone has info on a good donor for a 4 piston caliper too please advise! Thanks!

November 16th, 2012, 03:36 PM	#3
dino74 ninjette.org certified postwhore Name: dino Location: Oceanside, Ca Join Date: Nov 2010 Motorcycle(s): '09 250 Street, '09 250 Race, '13 300 Race Posts: A lot.	I think stock Ninja 250 is either 13mm or 12.7mm. I'd guess a radial 16x18 or axial 12mm master cylinder would be what you want. __________________________________________________ CVMA #55

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November 16th, 2012, 03:33 PM	#2
k-os ninjette.org sage Name: Andy Location: Sheboygan, WI Join Date: Dec 2008 Motorcycle(s): 1988 Honda Hawk NT650, 1989 Honda Hawk NT650, 1997 GSXR750 Track Bike Posts: 890	I'd think a larger diameter MC piston would get you a quicker bite.

November 16th, 2012, 03:39 PM	#4
old3 ninjette.org sage Name: Jim Location: NJ Join Date: Nov 2012 Motorcycle(s): Ninja 300, KTM EXC610SMR Posts: 913	Hmmm, from what I've gleaned a smaller piston in the master or a larger piston in the caliper will accomplish this. I'm hoping to find a rider who has achived the lower effort/higher power at the lever that I want. I've had an oversized master that left my lever feeling wooden, not what I want. I know I can use my whole hand but I'm coming off a KTM 950 SMR with full radial Brembos and my 530 with sumoto wheels and 320mm rotor and want to get a close to that as I can. Anyone ever put a bigger rotor on a 250 with a caliper relocator? 320mm maybe?