STM Evo Slipper Clutch - slipping !! - Ducati.ms

williamtell · Oct 21st, 2011, 9:30 pm

I had an STM Evolutione clutch fitted around 6k kilometres ago and whilst out on a particularly hard and fast ride on my 'tard today it started to slip which i was accelerating which i'm assuming means the plates are at starting to wear.
I'm considering replacing them myself but i see you need an STM tool kit and also i'm having a problem finding the spare plates for sale.
Any advice anyone could give, like don't bother just take it to your dealer .. ?!!
I also notice on another thread that it's recommended they are taken apart and cleaned every 2k !! is this correct?

08hyper · Oct 21st, 2011, 11:19 pm

If the clutch pack is a std 12t you can get a Barnett clutch pack, and order a couple of thicker & thinner steel plates, so you can achieve a stack height 36.5mm, also get a good set of HD pressure plate springs like TPO's and you should be good to go. Aloha Alex

Ben710 · Oct 22nd, 2011, 4:14 am

No on the cleaning every 2k miles.

The STM tools cost 200€ over here. I had a STM clutch in a Husqvarna engine and there are not many options rather than buying the factory tools in order to get the thing apart. Which is why I would probably never buy one of these clutch designs for any bike I own.

There was a guy who made the tool himself and lent it to me for free, but since you´re in a land far far away, sending it back and forth is not an option.

If you have access to a machine shop, water cutting, cnc machining, laser cutting, I could email you a PDF template. You could start by printing it out and cutting it on paper to see if it fits your clutch.

williamtell · Oct 22nd, 2011, 3:53 pm

Quote:

Originally Posted by 08hyper

If the clutch pack is a std 12t you can get a Barnett clutch pack, and order a couple of thicker & thinner steel plates, so you can achieve a stack height 36.5mm, also get a good set of HD pressure plate springs like TPO's and you should be good to go. Aloha Alex

Mines the 48 tooth

williamtell · Oct 22nd, 2011, 3:57 pm

Quote:

Originally Posted by Ben710

No on the cleaning every 2k miles.

The STM tools cost 200€ over here. I had a STM clutch in a Husqvarna engine and there are not many options rather than buying the factory tools in order to get the thing apart. Which is why I would probably never buy one of these clutch designs for any bike I own.

There was a guy who made the tool himself and lent it to me for free, but since you´re in a land far far away, sending it back and forth is not an option.

If you have access to a machine shop, water cutting, cnc machining, laser cutting, I could email you a PDF template. You could start by printing it out and cutting it on paper to see if it fits your clutch.

I've found a guy in the UK that selling the genuine (second hand) servicing tools and I'm going to buy them. Yea they cost a fair amount even second hand but the clutch is that good i'm likely to have another one on any other duke i get. (well thats what i'm telling the wife when she see's the money coming out of the account!) :-)

williamtell · Oct 22nd, 2011, 4:02 pm

As mine has started to slip at around 6k (kilometres) how many roughly should i be getting out of a set of plates?
Are there any options when it starts to slip other than replacing the whole set of plates which cost around $400?
Also any ideas where best to purchase plates? It doesn't matter if it's in the UK as the exchange rate is in my favour at the moment making UK purchases a bit better.

08hyper · Oct 22nd, 2011, 8:27 pm

Quote:

Originally Posted by williamtell

Mines the 48 tooth

Too bad.........those 48t plates are going to be mighty pricey..

Sometimes on Ebay you can find a good deal. Aloha Alex

Ben710 · Oct 23rd, 2011, 4:07 am

Clutches are picky in regards to stack height. Your plate stack height (or thickness if you want) has become too small for the clutch to operate properly. You should remove all plates and measure them. The usual slipp clutch stack height is 36.5mm. With the STM being a different design than the Bucci and all of its copies, I would recommend having a look at the official STM service manual. Afterwards, inspect your plates. With 12t clutches, you can buy different driven plates (those steel or aluminum discs without friction material) that alow you to adjust stack height. Iirc they´re available in 2 and 3mm.

Good luck.