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Discussion Starter #1 (Edited)
Guys, I am trying to decide on a slipper clutch, please no discussion on the merits or otherwise of having one. What I would like to know is comparing the STM evo to the Surflex unit. One of these will eventually make thier way into my 06 999R.

Yes I have searched the forum posts but have not found any comparative data, just a bunch of opinons on pros and cons of having a slipper.

Which has the lowest amount of maintenance?
Which has the best operationa longevity?
Which has the smoothest operation - engage/disenage?
Which has the lightest pull at the lever?

I am far more concerned with the operational issues mentioned above than the cost. Please lets not turn this into a product bashing, just some real world observations by people that are actually riding with these. :)

Thanks all
Cheers
 

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I've tried STM and most of the others ramp style slipper clutches ( Motowheels, yoyo, Bucci, DP...). The Surflex is my favorite. easist clutch pull, smoothest operation, lowest amount of maintenance, ...longevity appears to be the same so far. I have the Surflex on 3 of my bikes ( 916SP, 999R, M944).
 

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Don't the 999R come with a slipper clutch?

I don't own either one so I can't give you an opinion about which works/feels better. What I do know is that maintenance on all slippers would be the same, especially clutchplate stackheight. As the material starts to wear, you would have to maintain the correct stackheight by adding more steel plates. I'm also certain that ramp height(slip characteristics) are different between the various brands that are out there. STM Evo's use specific clutchpacks mfg'd by them and have two versions 12T vs. 48T. The 48T will give you more surface area and less wear on the basket tangs. The Surflex can use any clutchpacks available. I have the Yoyodyne unit with oem sintered plates and it has been troublefree and the least expensive of the bunch.

Here's article on installation/maintenance/stackheight. You may want to give Motowheels a call since they carry STM and Surflex.

http://www.yoyodyneti.com/ProductInfo.aspx?productid=T10901

http://www.yoyodyneti.com/motorcycle_slipper_clutch_operat.htm

http://ducatigarage.netfirms.com/pitstops3.html

http://www.motowheels.com/italian/myproducts.cfm?parentcategoryid=442%7CDucati%20Clutch%3A&CategoryID=467|Clutch%20Assemblies%20%26%20Parts%2D%20Slipper&collection=168%7CEuropean%20Motorcycle%20Parts
 

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Discussion Starter #4
cheech said:
Don't the 999R come with a slipper clutch?

I don't own either one so I can't give you an opinion about which works/feels better. What I do know is that maintenance on all slippers would be the same, especially clutchplate stackheight. As the material starts to wear, you would have to maintain the correct stackheight by adding more steel plates. I'm also certain that ramp height(slip characteristics) are different between the various brands that are out there. STM Evo's use specific clutchpacks mfg'd by them and have two versions 12T vs. 48T. The 48T will give you more surface area and less wear on the basket tangs. The Surflex can use any clutchpacks available. I have the Yoyodyne unit with oem sintered plates and it has been troublefree and the least expensive of the bunch.

Here's article on installation/maintenance/stackheight. You may want to give Motowheels a call since they carry STM and Surflex.

http://www.yoyodyneti.com/ProductInfo.aspx?productid=T10901

http://www.yoyodyneti.com/motorcycle_slipper_clutch_operat.htm

http://ducatigarage.netfirms.com/pitstops3.html

http://www.motowheels.com/italian/myproducts.cfm?parentcategoryid=442%7CDucati%20Clutch%3A&CategoryID=467|Clutch%20Assemblies%20%26%20Parts%2D%20Slipper&collection=168%7CEuropean%20Motorcycle%20Parts
The 749R gets the slipper but the 999R once again gets left out, you would think that for 40K they would throw one in. Oh well......
 

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Arrgo said:
The 749R gets the slipper but the 999R once again gets left out, you would think that for 40K they would throw one in. Oh well......
yeah, that is a shame.
 

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i have the STM evoluzione type one and am very happy with it. i've just had to replace the sprag spring (the 6 arm spider type spring) as it had broken, which is common apparently. the 748r takes the same spring so it wasn't hard to get. clutch pull is light and it works predictably and consistently, looks the goods too. havn't used a surflex so i can't compare but the STM has been fine for me.
cheers,
paul.
 

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I don't have any others to compare to but I've been VERY pleased with the Surflex... Easy to install, least expensive, very transparent in opperation and the clutch pull is sooooo light. I have CRG shorty levers and can use just 2 fingers all day long.
 
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