WTB-Front Brake Nissin Master Cylinder 2010 or later.
 

I love the front brake on my 2011 Gasser so, I decided to put a GG master cylinder on my 94 CR250. I am looking for a 2010 or later GG master cylinder for a reasonable price.:)

I think it’s the same as newish Japanese mx bikes. Not sure what years though but probably easier to source

i know a drz250 has the same caliper as a gas gas, and i think i've seen the same master on our friends wr450 but i dont know what year it is

The important factor is the bore size cast into to bottom of the housing.

This this this

Ok, But are the newer japanese master cylinders as strong as the euro bikes? I have heard jap brakes are not that strong.

I have a front brake setup Master slave and line and lever from an 07 for sale. $115 shipped to the anywhere in the US.

It seems that piston bore has a significant effect on the feel at the lever, with smaller pistons giving sharper feel and more pressure at the caliper, and larger ones feeling firmer in the hand.

All Nissin masters are Japanese. I highly doubt they make a different one just for GG/Beta. From memory I believe that Honda used to run stronger calipers to Yamaha, but I haven't confirmed that myself. I imagine used Honda parts should be easy to come across though.

A quick google turned this up: https://thumpertalk.com/forums/topic...a-front-brake/

Just checked the couple I have here.

2010 Master is stamped 9T, and has the brake line coming out the back of the unit. (maybe 16mm bore)
2013 is stamped 1T and brake line runs the same way as above. (11mm bore)

The 2013 has always felt softer at the lever, but given stronger stopping power.

The 07 setup I have has what looks like 11 to me on it.

Stamped around the back, beside where the line connects?

Yes right where you described

Typically 11,12 or 1\2"(12.45)mm. Its all about leverage. Smaller bore means more leverage but more travel. Radial are larger bore but lever acts on it differently. .

There is a sweet spot for caliper to mc ratio.

Try this, there is a sweet spot for lever position. Your hand works best at some point. I've only just realised I had it out too far. But then again I'd rebuilt the mc and it had less travel to it. So what was best compromise before was clumsy later.

I think that the main performance difference between your GG and the CR250 is the rotor diameter, GG is 260mm whereas the Honda is 240mm. I would first try an oversized rotor ,I think then that you'll find it similar. Next try a braided brake line, at that point you'll have the same mc, line, caliper, and rotor on both bikes. If you are still not satisfied then you can swap to the 07-present CRF 250/450R only (not 250/450X or 07 cr125/250) front mc which has an improved feel at the lever compared to the earlier unit. From what I can tell the GG mc is the same as the pre 2007 Honda models so if you were to make all of the suggested changes you could obtain greater performance from the Honda vs the GG.

Yup. Again leverage. Bigger rotor means longer arm you can pull up the hub with.

I already installed a 260mm Wave Rotor and a braided line.Its good now, strong and progressive but it won't lock up the front wheel under a load like my GG.

Try a stick in the spokes

Thanks for all posts! I have been xmas shopping and doing the holiday thing so I haven't had time to read them all. I'll try to look them over and post an update in a few days, :D

My bad, I think you are right. I installed a Braking Wave Rotor HO09FID. I checked the rotor this morning it is 240mm not 260mm, so that was my bad.

I just installed a Nissin front master cylinder from a 2011 GG on my Honda. BIG DIFFERENCE. Just a lot more feel and power. I will give her a test ride and post an update.:)

what numbers are cast into your Honda master?

Im in the opposite situation, my 2011 MC has broken at the pivot (Nissin 11MM)

I have a 1/2" cheapanese one currently fitted and the brake is pants.

Im trying to source a Honda MC as they are much more common here in the UK.

My Honda master cylinder is from a 94 CR 250. I think probably any CR master cylinder will fit your gasser.

I bought a cheaparsey CR copy. Think it turned out to be 1/2" which is bigger than 11mm, hence less leverage.

That's great thanks, CR/CRF looks to be the closest match, YZ/WR/KX/RM all have the hose coming off the front which I don't think would be an issue in use but prefer to get it as close as possible.
Read a few reports of the Honda MC using their own developed piston compared to the others which helps.

Ive found a few Honda MC on Ebay but some of them have 1/2 cast into them so I suspect would be no better than my current one. Any idea what year Honda went to 11mm?

I will look at my 94 Honda MC when I get home.

I have a gg unit stamped with the 11 for sale. The whole setup, master, lever, line and caliper. $100 plus shipping