[ELTWIN]

Originally Posted by Snowleopard8

Can you modify the stock slave?

Yes, I made some tooling to bore them out and fit a larger piston and seal, however 29mm is the largest Diameter they will safely go to. The first one I did is now 2 years old on my mates 1098 and still going well. It reduces lever effort asnd improved feel as expected.
I also consider Oberon products to be easily as good a quality as STM.

[alex1099]

Originally Posted by ELTWIN

Yes, I made some tooling to bore them out and fit a larger piston and seal, however 29mm is the largest Diameter they will safely go to. The first one I did is now 2 years old on my mates 1098 and still going well. It reduces lever effort asnd improved feel as expected.
I also consider Oberon products to be easily as good a quality as STM.

some people say that with the stm could not find the netural gear easily... is that trooth?

[joe1972]

Originally Posted by alex1099

some people say that with the stm could not find the netural gear easily... is that trooth?

I don't know about that product per say... but when you open up the system air sticks to everything!
You need to flush and bleed the HELL out of your system to get the bubbles out!
When you do it you need to make sure you TAP GENTLY on the clutch slave to try to get the air bubbles stuck in there to let go! It will take a LOT of Patience and time to do it right... I don't know why air bubbles cause this problem but they do.

Good Luck!

[ELTWIN]

Originally Posted by alex1099

some people say that with the stm could not find the netural gear easily... is that trooth?

The STM is a bitch to bleed on the bike because the inlet is on the end not at the top and it traps air...... I bleed it before I bolt it on. Much easier!

[Marlon]

Originally Posted by joe1972

I don't know about that product per say... but when you open up the system air sticks to everything!
You need to flush and bleed the HELL out of your system to get the bubbles out!
When you do it you need to make sure you TAP GENTLY on the clutch slave to try to get the air bubbles stuck in there to let go! It will take a LOT of Patience and time to do it right... I don't know why air bubbles cause this problem but they do.

Good Luck!

that's because you can compress the air but not the hydraulic liquid..

www.cylinder-hydraulic.com/.../fundamental-hydraulic-fluid-compression

this one is even better..


www.howstuffworks.com/hydraulic1

edit: here is a resume...

Air in the System
It is important that a hydraulic system contains no air bubbles. You may have heard about the need to "bleed the air out of the brake lines" of you car. If there is an air bubble in the system, then the force applied to the first piston gets used compressing the air in the bubble rather than moving the second piston, which has a big effect on the efficiency of the system.

[ttpete]

Originally Posted by ELTWIN

The STM is a bitch to bleed on the bike because the inlet is on the end not at the top and it traps air...... I bleed it before I bolt it on. Much easier!

You must have an older one. My new one has the inlet on top. I always fill the slave before connecting up the line.

[joe1972]

-Marlon-

I was refering to the problem with finding neutral... for some reason when people have issues with that it goes away when you re-bleed your clutch...?

[Marlon]

Originally Posted by joe1972

-Marlon-

I was refering to the problem with finding neutral... for some reason when people have issues with that it goes away when you re-bleed your clutch...?

yes Joe...i guess in 99% of the cases this will cure the problem...thats why it is so important to do the bleeding correctly..so take your time

[joe1972]

Originally Posted by Marlon

yes Joe...i guess in 99% of the cases this will cure the problem...thats why it is so important to do the bleeding correctly..so take your time

Well can you answer why this is the case?
If air is in the system then I understand the spongy feel of the cluch and the need to get it purged...

But how does it affect finding neutral?
I thought that would just be a mechanical factor as in just finding it with your foot control and proper foot lever use... So what does a bubble stuck some place do that interfers with this process?

[pat1098]

When you have air in the system some of the finite travel of the clutch lever is used up compressing the air.
A properly bled system with new fluid will achieve greater separation of the clutch plates, thereby making it easier to find neutral, and quieter into first when at a standstill.
The larger the slave cylinder piston (28, 29 or 30mm) the lighter the lever action, and the more progressive the clutch 'take-up'. However the larger piston disengages the clutch less for a given lever travel.
Therefore a system with a larger slave cylinder piston needs bleeding more frequently to work nicely, and may need lever adjusting away from the handlebar slightly to find neutral easily.
And don't forget to bleed the master cylinder on the handlebar, as air collects there.