1090RR clutch master cylinder rebuild kit? - Page 2 - MVAgusta.net
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post #11 of 23 (permalink) Old 04-02-2019, 03:58 PM
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Last night I was planning to test the new seals from the K&L kit on the original piston.
(Background: slave piston was not returning into slave cylinder causing clutch to remain engaged.)
I felt the problem was with the length of the replacement piston included in the rebuild kit.

In order to get the slave piston back into the slave cylinder before taking apart the master I bleed the slave at the master (through previously installed bleed port), then found the clutch engages and disengages.

Reinstalled everything, closed clutch cover filled with fluid and started bike.
With rear wheel off the floor, tire spins in neutral. Is this normal? Should I be concerned?

I feel so confused!

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post #12 of 23 (permalink) Old 04-02-2019, 04:11 PM
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There is friction between the components of the drivetrain even with the transmission in neutral.

If a slight drag of the hand on the wheel stops the motion, then you are fine.

If, on the other hand, the wheel is being driven hard, then you have an issue.

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post #13 of 23 (permalink) Old 04-02-2019, 07:51 PM
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Did you go back to the original piston with the new seals? If you still have the long K&L piston in there it is going to do the same thing as before after you ride it a few miles (clutch never engages, bike doesn't move).

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post #14 of 23 (permalink) Old 04-02-2019, 08:30 PM Thread Starter
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Sorry for the lack of timely response. I have received the kit as well, though have yet to install. (I am waiting on the gasket for the MC res.)
I did not mean to imply that the actual pistons between the K&L kit and the original B4 MC would be identical, rather, I hoped, and still hope, that the seals from the kit could be used on the original piston. Your last post seems to confirm this?

Unfortunately the gasket I need is on back order. Motoforza in Escondido has no info on when it will come in. I will try to compare the seals fro the K&L kit with the originals tomorrow and update this.

Robert

1090RR
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post #15 of 23 (permalink) Old 04-02-2019, 09:22 PM Thread Starter
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Quote:
Originally Posted by fkhan View Post
Correct. The piston from the kit will not work. I will try the seals(from the kit) on the original piston.
It is likely the original piston is good and replacing the seals is all that is needed.

Separately, I am looking to determine how to increase the volume of fluid coming out of the MC. Any ideas would be welcome.
As esq'z me observed, you would need fit another master cylinder. However, apparently one can, by replacing the slave cylinder, achieve better modulation with an easier lever similar to what I presume you are interested in accomplishing with a different master.

Unlike the clutch master which goes around $700 (US), slave upgrades can be had for around $100:

https://www.designcorse.com/products...lutch-cylinder

Robert

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post #16 of 23 (permalink) Old 04-03-2019, 12:55 PM Thread Starter
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I rebuild my clutch master cylinder this morning using the seals from the K&L kit # 32-4142.

I can confirm that the seal bearing surface dimensions between the two pistons (The K&L kit piston and the original MV) are identical.

After installing the new seals on my original piston, and bleeding the system, I have full clutch disengagement and excellent lever feel. I still lack the gasket for the res. so no road test yet.

The kit piston and spring are both longer than the original, and cannot be used.
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1090RR
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post #17 of 23 (permalink) Old 04-04-2019, 10:10 PM
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I also installed the kit gaskets and feel seems smooth.
I will start it tomorrow to determine the drag. With the bike in 1st and clutch pulled in there was significant tension.

One of the complaints is the clutch is hard to pull. The kit spring is softer I hoped it would solve the stiffness problem for us. Unfortunately, I suspect it is not allowing enough fluid to get to the slave.

Rob, can you please compress and measure the spring that came with the kit? I would like to compare it to the original. Thank you.

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post #18 of 23 (permalink) Old 04-05-2019, 06:03 AM
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The spring won't change the feel so much...that is a function of the clutch springs and hydraulic pressure generated by the ratio of master to slave cylinders.....but if the spring is preventing full movement of the master piston you will not get full movement of the slave.

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post #19 of 23 (permalink) Old 04-05-2019, 07:26 PM Thread Starter
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Quote:
Originally Posted by fkhan View Post


Rob, can you please compress and measure the spring that came with the kit? I would like to compare it to the original. Thank you.
59.5 mm uncompressed, and about 12 mm at coil bind. I want to say the original was almost half that length.

Robert

1090RR
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post #20 of 23 (permalink) Old 04-05-2019, 07:30 PM Thread Starter
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Quote:
Originally Posted by esq'z me View Post
The spring won't change the feel so much...that is a function of the clutch springs and hydraulic pressure generated by the ratio of master to slave cylinders.....but if the spring is preventing full movement of the master piston you will not get full movement of the slave.
As usual, esq'z me is right. The clutch springs are substantially stiffer, and the ratio of diameters of the master to slave determine the mechanical advantage. The master spring is just enough to overcome the internal friction and the spring on the clutch switch.

Robert

1090RR
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