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Discussion Starter #1
Hi,
I was wondering if anyone has had problems over time with their evoluzione clutch slave cylinder... In my post below, I possibly need a new one. The Evol is cheaper but my dealer (speed's cycle in Baltimore) says all the evol's he installs end up leaking and he has to send them back. He is urging me to go for the more expensive yoyodyne unit.

I'd be interested to see how people have fared with the evoluzione slave cylinder.

Thanks
Stuart
 
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Happy EVO user, no problems whatsoever and I even have the old style unit with the round barrel.

I like its look, the price was right and Ken is a stand-up guy when it comes to his products and support.
 

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i've tried and sold the 3 popular US brands; yoyodyne is the brand i sell.

only problems encountered are when throwout bearing fails and the push rod starts ruining the piston. they're fix it at greatly reduced cost, even though it's not their fault. 8) but they'll only do this once. ;)

:) chris
 
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Discussion Starter #5
I just spoke with a Ken at Evoluzione. He informed me of the 10 yr warranty and also said there were 6 returns last year out of thousands sold. So I wonder if my service guy was confused or being a little misleading.
Oh well. Thanks for the responses. I think I'll go with Evoluzione and save a few bucks over yoyodyne.
 

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it's possible your service guy didn't know. it's also possible he is a theif. you would be the best judge. anyway, glad there is a free fix for you!
 

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Discussion Starter #10
We used to sell the Yoyo slave cyclinders but the service
and price was always better with evoluzione. We sell the entire evo kit with two bleeder screws and a bleeder pump bottle for $165. The Yoyo was $200 for just a slave cylinder.
Get the evo.
 
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I think STM has new one also, and it might be cool for the look factor as I believe it comes anodized in groovey colors.....
 

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Ah.. that 10 year warranty sounded a little too good to be true.

Chris, in the article I found it said the following about Yoyodyne:

On the Monster, Yoyodyne's standard 25% reduction ratio was just a little too much, resulting in partial clutch engagement even when the lever was fully pulled in. While traveling at speed this did not pose a problem. However, once stopped at a traffic light, we found it impossible to engage neutral. This is a clutch spring/clutch plate problem that Yoyodyne shouldn't be blamed for, but since the clutch engaged and disengaged fine with the factory slave cylinder, we had to make note of it in the test.

I was thinking about getting one, but this scared me off a bit. Do you have any comments on that? Thanks.
 
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Well, Chris and I had the total opposite experience with the two manufacturers.

I guess you should just flip a coin...heads: I save $35...tails: I spend $35 more...the rest is a toss up.

There is also the STM slave cylinder in case you lose the coin.
 
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well I have had my yoyodyne for two years now works great
and I always find neutral, never once had a problem with the clutch........The shop where I bought mine from also has praise for the yoyodynes.
 
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yet I am attracted to purty bits.........and STM seems to make great stuff.

 

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On my S4 the levers have four adjustment points numbered 1 through 4. position 1 provides maximum lever motion but makes the lever a bit wide off the handle bars for my smaller hands. Position 4 has the least lever motion and is most comfortable for my hands. I noticed that with the stock slave I had no problem finding nuetral in all lever positions. However, after installed the evol unit, position 4 (least motion) made it very difficult to find nuetral. Slipping it down one position solved the problem.

I think that this is characteristic of all after market slaves that advertise reduced pull force. In order to achieve reduced pull force, the slave cylinder plunger has to be wider (more surface area) and thus does not move quite as far (bore requires more fluid to enter for same linear motion) and can result in not fully releasing the clutch under conditions where the lever has the least motion.

For me, the difference between position 4 and position 3 was not significant so I solved that problem by just using position 3.

Borg Girl
 
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YoYo's are hard anodized and EVO's are color anodized. Difference is YoYo's will tend to wear less. Reality is, slave does not cycle hundreds of thousands of times and wear is not an issue. I have an Evo and have had no problems. I guess I could have paid for a YoYo, $35 is about the price of an oil change. No big whip. I have about 6K on the new slave. No sign of leak.
 

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Chris, in the article I found it said the following about Yoyodyne:
On the Monster, Yoyodyne's standard 25% reduction ratio was just a little too much, resulting in partial clutch engagement even when the lever was fully pulled in. While traveling at speed this did not pose a problem. However, once stopped at a traffic light, we found it impossible to engage neutral. This is a clutch spring/clutch plate problem that Yoyodyne shouldn't be blamed for, but since the clutch engaged and disengaged fine with the factory slave cylinder, we had to make note of it in the test.
I was thinking about getting one, but this scared me off a bit.
 
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