general babbling about master cyl and the single blue or gold dot caliper

[m in sc]

So,

I have 2 rds running single yamaha calipers, one blue dot, one gold dot. In the quest to find that good lever feel, ive tried a bunch of different units, 12mm, 13mm , 10mm, 11mm.

from what -I- have found, the 11mm master from either a KX85 or YZ85 (nissin) seems to be the -perfect- ratio for these setups with a stainless line and a big rotor. only downside is slightly shorter lever (which i actually like) and no brake switch.

However,

you can get a banjo bolt brake switch. this takes place of the bolt, has 2 wires, and bam. done.

I used a grom master for a while, and while good, was a bit wooden for my tastes, as was the KTM390 duke one.

Just passing along some info. hope this helps somebody. I have found them for 130 ish, i think the KX ones.

[oxford]

For reference, do you know what size the Grom and Duke masters were?

[Evans Ward]

Years back after a lot of research on blue vs gold dot calipers, I found the difference was that the gold dot has aluminum pistons internally vs steel ones in the blue dot ones.

[Kawtriplefreak]

Frank B did the research when we did our conversions and found out that a Yamaha Zuma Scooter has an 11 MM Master Cylinder. I bought one used on flea bay for $30 shipped if memory serves. It comes with a brake light switch and bolts right on. They work perfectly for this application.

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[m in sc]

pretty sure the grom and ktm ones are 12. not sure.

good note on the zuma one timmy, you told me that, i completely forgot that. 

[Kawtriplefreak]

 

[retaRD]

I'm running a single silver dot with a Duc 320mm rotor, braided line, and a Yamaha warrior master (four wheeler).
I haven't felt better brakes on another single rotor bike.

[SUPERTUNE]

I like the Ducati 320mm with bluedot 4 pot R6 caliper and the XS400 14mm master.
Just did a this setup on Paul's STG 2 '76 RD400
Chuck

[Kawtriplefreak]

I am surprised you can use a 14MM master cylinder with a single caliper. Mine was very wooden feeling with a 14 and marginal at 12. That's why I went on the hunt for an 11MM. That being said if it works that's good.

[pdxjim]

I'm running a 12mm EX300 master with blue spot caliper and 320mm disc on my TDR.

Feels great and night n' day difference to the stock setup.

[m in sc]

i was pretty ok with a 12, like the 11 more, just my .02 preference.  fzr rotor though.

[Kawtriplefreak]

FZR rotor for Frank and me too.

[Organicjedi]

I am surprised you can use a 14MM master cylinder with a single caliper. Mine was very wooden feeling with a 14 and marginal at 12. That's why I went on the hunt for an 11MM. That being said if it works that's good.

The stock MC on a US spec RD is over 15mm (5/8) with the single stock caliper. Wooden? A bit. 14mm would be an improvement. Not enough for me to change it though. I would if I ever had to replace it for some reason.

I'm sure the feel would be a lot worse with a blue dot and the MC would have to be changed. Glad all you guys have done the experimenting already.

[m in sc]

actually a lot of people prefer a 13 on a stock rd caliper. I tried it didn't like it, prefer a 14. have a 12 on the rear on on the lc, gives really good feel with a much shorter brake lever.

[Dvsrd]

I am surprised you can use a 14MM master cylinder with a single caliper. Mine was very wooden feeling with a 14 and marginal at 12. That's why I went on the hunt for an 11MM. That being said if it works that's good.

FWIW, the Yamaha "...dot" calipers have a bit snakker pistons than the equally available Brembo 4 piston calipers (34/34), so work better with a small MC. Stock RD calipers, as well as Brembo work great with a 13 mm MC