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Discussion Starter #1
All,

After my trip up Pikes Peak Mt my clutch has been rattling a little bit and will not engage until the last little bit of the clutch lever movement. The radial master cylinder started to leak going up Pikes Peak and on the way down. Also the clutch got hot from all the slipping trying to go 10mph up a mountain. I stop and checked it but I could not find where the leak was. I tried rebleeding the hole clutch system with no luck. So I just figured the clutch had over heated and needed to be changed. FYI the clutch has never slipped while riding. So I took the clutch a part and here is what I found.

2011 Ducati 848 Evo Clutch Numbers: 8/26/2014


Plates to Basket Clearance: 0.3mm Max:0.6mm


Flatness: All Friction Plates GOOD Max:0.2mm


Clutch Pack Thickness: 50.10, 50.10, 50.05, 50.10: Min 46.10mm


Friction Plate Thickness: 2.97, 2.88, 2.89, 2.96, 2.99, 2.99, 2.96, 2.95, 2.95, 3.00 Min:2.60mm


Steel Plate Thickness: 1.52, 1.52, 1.56, 1.98, 1.97, 2.00, 1.96, 1.56, 1.58, 1.57
Min: x.xxmm




Spring Length: 50.06, 50.09, 50.06, 50.08, 50.12 Min:41mm


Friction Plate:
Friction Plate.jpg

Steel Plate: Worse Condition
Steel Plate Worse Cond.jpg

So how does the clutch look to you, to me it looks OK.:confused:

After looking at the clutch pack I am now thinking that maybe it is the clutch radial master cylinder or the clutch slave cylinder. I have been trying to find a rebuild kit for the radial master cylinder.
 

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First off I don't know if your clutch is within spec or not, but from what you have posted you have around 3mm of wear on the metals if 2mm thickness is new spec. You have 3 plates around 2mm and the rest around 1.5mm, a fair bit of variation I would say. If that were me I would be asking someone that knows or check the workshop manual to see if that's within spec or not.
You bled the system, so how does the lever feel now, firm or spongy?
Not sure if a rebuild kit is available for the master or not, pretty sure no kit for the slave though.
Let us know how you get on?
 

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I have a 2011 evo as well, my clutch has chattered since day one, my buddys 2009 848 doesnt, but ive never had any problems with it so i never worried. i have a spec clutch on my car and it chatters ten times worse so i never even thought twice about the bikes little chatter.
 

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The service limit on 3 mm friction plates is 2.8 mm.
For 2.5 mm plates the service limit is 2.3 mm.

The allowable gap between the plates and basket is 0.6 mm.
 

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Discussion Starter #5
360 there are two size of steel plates in the 848 clutch pack, 1.6 mm and 2.00mm. I sanded the steel plates with 320 and WD40 on glass plate and reassembled the bike. I decided to to check the clutch slave and I did find some fluid in it. I am going to cycle it tomorrow to see where the fluid is coming from. The bike has around 15,000 miles so it may be time to change the slave cylinder.
 

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Yea, you probably got air in the system or something. I can't imagine the clutch pack having any issues in such a short period of time.
 

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Ever stop and think maybe the elevation might have played a part in it?

Maybe you had some air in the system, not enough to notice at lower elevations but as you got higher in elevation the air in the system expanded and caused issues in your OP.

I havent took the Monster up there yet, but I have drove the car up there and I have seen a unopened bag of chips that I bought down in the Springs and as we got higher towards the top the bag of chips literally exploded.

Just a thought.
 

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One other option to look at is the clutch line. I remember several new 848EVO's out of the crate needing to have the line replaced in '11. It wasn't a recall since it wasn't large enough, but it was replaced under warranty.
 

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Discussion Starter #10
Got it all back together and it feels better, but I am currently not able to ride since they just chipped and seal my road, so now it is like a gravel road.
 
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