Alternative/Replacement Clutch Master Cylinder - SV1000 Portal
 
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post #1 of 3 (permalink) Old 13th October 2020, 10:23 AM Thread Starter
L-Plate Rider
 
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Alternative/Replacement Clutch Master Cylinder

Good Morning all,

It would appear that this topic has been brought up several times on the forums, however all of the posts I have come accross dont list bore sizes, which is the most important bit of information.

From what I can gather, alot of people have swaped both brake and clutch master cylinders with those from a zx14, some with pictures, but none with the markings to let people know what size they are. Here I will list changes in the ratios based on this and the respective bore sizes so we know what we are talking about.

Stock Suzuki:

Clutch Master Cylinder: 14mm bore (as per marking on the cylinder) x 20mm stroke (as best as i can measure)
Brake Master Cylinder: 16mm bore x 20 mm (as best as i can measure)

ZX14/ ZZr14 etc. :
Clutch Master Cylinder: 3/4 inch ie. 19mm bore x 20 mm stroke - this is the only size i could find on the internet, only other one i could find that kawasaki have put on their bikes is the 11/16 one for the new H2.
Brake Master Cylinder: 11/16 inch ie. 17.5 mm bore x 20 mm stroke

Stock Suzuki Brake Ratio is 32.5:1, with the Zx14 17.5mm master, the ratio is 26.86, which about what I am after.

Stock Clutch Ratio is 6.24, and with the zx14 3/4 19mm master, the ratio is 3.39.

The important aspect, which is my main concern to those who say they using one from a Zx14, is the slave cylinder travel and whether or not the increase from 3.2mm to 5.89 with the 19mm master cylinder clears the clutch case.

So long story short, to anyone who has done a radial master cylinder swap for their clutch on an SV, would you please tell me the piston size, and if you have done it with one from a Zx14, is it a 19mm master cylinder?

many thanks to any who have read this far and any information on the topic would be most helpful.

best,
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post #2 of 3 (permalink) Old 14th October 2020, 12:11 AM
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Quote:
Originally Posted by FinishedFall View Post
Good Morning all,

It would appear that this topic has been brought up several times on the forums, however all of the posts I have come accross dont list bore sizes, which is the most important bit of information.

From what I can gather, alot of people have swaped both brake and clutch master cylinders with those from a zx14, some with pictures, but none with the markings to let people know what size they are. Here I will list changes in the ratios based on this and the respective bore sizes so we know what we are talking about.

Stock Suzuki:

Clutch Master Cylinder: 14mm bore (as per marking on the cylinder) x 20mm stroke (as best as i can measure)
Brake Master Cylinder: 16mm bore x 20 mm (as best as i can measure)

ZX14/ ZZr14 etc. :
Clutch Master Cylinder: 3/4 inch ie. 19mm bore x 20 mm stroke - this is the only size i could find on the internet, only other one i could find that kawasaki have put on their bikes is the 11/16 one for the new H2.
Brake Master Cylinder: 11/16 inch ie. 17.5 mm bore x 20 mm stroke

Stock Suzuki Brake Ratio is 32.5:1, with the Zx14 17.5mm master, the ratio is 26.86, which about what I am after.

Stock Clutch Ratio is 6.24, and with the zx14 3/4 19mm master, the ratio is 3.39.

The important aspect, which is my main concern to those who say they using one from a Zx14, is the slave cylinder travel and whether or not the increase from 3.2mm to 5.89 with the 19mm master cylinder clears the clutch case.

So long story short, to anyone who has done a radial master cylinder swap for their clutch on an SV, would you please tell me the piston size, and if you have done it with one from a Zx14, is it a 19mm master cylinder?

many thanks to any who have read this far and any information on the topic would be most helpful.

best,


The ZX14 units are 3/4 and are marked on the casting as all brake and clutch master cylinders typically are.

I am confused on your measurements though. The “stroke” as you have listed is only part of the equation. You need to look at mechanical advantage of the pivot point also.

Total fluid pumped is key.

-ms


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post #3 of 3 (permalink) Old 14th October 2020, 01:55 AM
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Welcome to the site first of all......

I agree with Schmidt314.....

Bore gives the hydraulic advantage of more pressure for a smaller bore, but less fluid moved for the same movement....

One owner..... 313,000kms and counting...

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