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Buell Forum » 1125R Superbike Board » Archive through May 12, 2016 » Clutch Slave Diameter: EBR vs Buell « Previous Next »

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Cbi
Posted on Sunday, April 03, 2016 - 06:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I am in the process of replacing my weeping clutch slave on my 09 CR. I ordered a new kit from EBR (through LAP).

Once I got the cover off and removed the slave assembly, I immediately noticed the difference in piston diameters between the EBR setup and the Buell setup.

Without changing the clutch master, if the EBR slave is installed, it will have a longer stroke, and the force at the lever will be increased.

This is either an intentional change from EBR, or I possibly purchased a slave cylinder to be paired with a different master cylinder. I'm hoping someone can shed some light on the subject.

In the photo: EBR on the left, Buell on right.

EBR slave piston diameter (left): 37.75mm
Buell slave piston diameter (right): 40.90mm

(note the lovely patina and bouquet on the Buell piston)




EBR and Buell 09 Clutch Slaves
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Vagelis46
Posted on Monday, April 04, 2016 - 06:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have installed the EBR piston 1 year ago on my 08' 1125R, because the OEM was leaking.... It works great !

The leakage has ever since stopped , and the "feel" on the clutch lever has improved significantly.... It doesn't engage at the near end on the travel as it used to... Much better now .....

(Message edited by vagelis46 on April 04, 2016)
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Mustang0
Posted on Monday, April 04, 2016 - 12:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

How much did the parts cost? And what are the part numbers, please, I would like to know for future reference. Thanks
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Mustang0
Posted on Monday, April 04, 2016 - 04:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What are the part numbers to do this upgrade please. Thanks
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Thefleshrocket
Posted on Monday, April 04, 2016 - 05:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Do you plan to remove the "patina" from the EBR piston?
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Ceejay
Posted on Monday, April 04, 2016 - 10:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'd think that the diameter of the slave is fine, and actually probably gives more modulation like Vagelis stated...

I've an 08 that developed a leak right after I got it at 4900 miles. 1000 miles later I finally broke down and bought a new set from Oberon - Ordered it direct from Oberon on Thursday morning, received it at my door Friday early afternoon! Had it in my bike that night, but due to other commitments didn't get to try it out until Sunday - most excellent. Two finger pull on short levers. Smooth as silk. I had some trepidation, thinking that how much can clutch effort be improved, but if anyone is considering it and especially if you have a leak I'd certainly go for it. It wasn't cheap, but I'm certainly happy with it.
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Sprintst
Posted on Tuesday, April 05, 2016 - 10:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My 2008 1125R was fine, my 2009 which sat for 3 years before I bought it developed the leak.

The EBR fix has been working great
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Ericz
Posted on Wednesday, April 06, 2016 - 12:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Cbi, how does the inner diameter compare between the two? The surface area is really what matters. If the ID is the same, then yes, the surface area of the two will be different along with stroke and lever effort.
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Cbi
Posted on Wednesday, April 06, 2016 - 09:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

EricZ, the inner area of the pistons is the same between the EBR and Buell setups.

Thanks to everybody who posted for the info!

(Message edited by Cbi on April 06, 2016)
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