STM Evoluzione Slipper / Clutch Pull Issues - Advice please - Ducati.ms

SilverTT · Nov 3rd, 2009, 9:22 am

I recently picked up a pre-owned HM 1100s with a really nice list of mods: DP perf cams, damper, full termis, STM Evo slipper, Pazzoz shorty levers, carbon, etc.

The bike is amazing and I love it except for one thing - the clutch pull is killing me. I drive 90% of the time in NYC and the stop/go is unbearable with this clutch. I just had the 28.5mm clutch slave installed (can't remember which brand, I think it was the Ducati Evoluzione 28.5) hoping that would solve the problem and from what I can tell it did absolutely nothing at all.

I have heard the shorty levers are part of my issue due to less leverage, but this clutch is so tough that I can't imagine a little more leverage is going to do much. Besides my goal is to use my front two fingers to clutch and I would think the additional leverage would come from the outer ends of the stock lever no?

Bottomline is I think the prior owner wanted the most aggressive setup he could find and/or has hands like king kong. Anyone else running the exact same setup as me and find a solution to this problem?

The shop manager at Ducati who has driven everything under the sun actually grabbed the lever after the install of the 29mm slave and said, "damn that clutch is still really hard" so I know its not just me that feels this way.

richmeyer · Nov 3rd, 2009, 9:56 am

Hypremotard · Nov 3rd, 2009, 10:27 am

Try different springs? I'm in NYC with stock levers and slave. I have replaced the springs irf you would like to try my clutch lemme know.

disgo duc · Nov 3rd, 2009, 2:05 pm

that stm slipper you got is old technology get rid of it...they are known for being tough on the pull....pull it out and put a stock clutch in or get evr slipper and be done with the other!the evr slipper will last for 10,000 miles or more and are way more less expensive than the stm.you should find someone on the the forum or sbay that would buy your stm.thats my advise

SilverTT · Nov 5th, 2009, 3:12 pm

Quote:

Originally Posted by Hypremotard

Try different springs? I'm in NYC with stock levers and slave. I have replaced the springs irf you would like to try my clutch lemme know.

That would be great. Are you around this weekend? I have to go out east on Sat but I'll be in the city all day Sunday. Maybe meet up early afternoon. I'll shoot you a pm with my cellphone.

-Dan

SilverTT · Nov 5th, 2009, 3:29 pm

Quote:

Originally Posted by disgo duc

that stm slipper you got is old technology get rid of it...they are known for being tough on the pull....pull it out and put a stock clutch in or get evr slipper and be done with the other!the evr slipper will last for 10,000 miles or more and are way more less expensive than the stm.you should find someone on the the forum or sbay that would buy your stm.thats my advise

If that is the case I should think about changing to a different Slipper but one of the guys at the parts desk of Ducati NY said the slipper shouldn't change the clutch pull at all. I thought that was strange as why wouldn't different clutches with different plates/springs, etc have different pull tensions?

Have you actually felt the difference between an otherwise stock STM and EVR?

Also have the Pazzoz shorty levers and that is probably not helping but I like to pull with two fingers so even with stock levers I would be pulling on the shorter side of the lever.

Caidly · Nov 5th, 2009, 4:20 pm

If you want to trade the slipper for a stock, I'll show up Sunday as well.

hyperdookie · Nov 5th, 2009, 4:37 pm

If the STM has index marks on the pressure plate and studs like the OE and these are not alligned, that could cause your symptoms.

SilverTT · Nov 15th, 2009, 12:14 pm

Went for a long ride last weekend and the clutch pull didn't seem quite as bad as my first impression. Pretty much acceptable now.

Do need to use three fingers unless I want to really put more effort into using 2 fingers. Of course I'd like to figure out a way to get the pull to a resistance level where I could always use 2 fingers so will talk to the guys at the shop again this week.

Other than that I have to say I love the STM Slipper. It is so nice to be able to do an aggressive downshift and have the clutch soak up what otherwise would be unsettling lock up.

hbliam · Nov 15th, 2009, 1:41 pm

The clutch lever makes a huge difference. It's not the number of fingers pulling, it's the ability to "lever" the lever from further outboard that really helps. I have Pazzo's, a shorty brake and regular clutch.