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That clutch again...

zippy49

zippy49

Joined Nov 2013
1K Posts | 1+
Inland SoCal
Short version: Has anyone changed out the clutch pack on their early Hyper 821?

Long version: I've been caught by that grabby clutch too many times. If the revs are just a bit too high or I let it out just a bit too quickly I end up stalling the engine half the time. This has become more of a problem since my riding buddy got his Streetfighter, and leaving stop lights has become a bit more -um- competitive. Also, a recent hand injury is not helping.

I will try unplugging the flapper valve motor, but just for grins I called my dealer for a price on replacing the clutch pack with a later one. He quoted me $450 for the parts, and $350 labor. Now, I spent more than that on Andreanis for our 390 Duke, and I don't ride it nearly as much. I'm about a thousand miles away from my next service, so I might ask for the clutch work too.

If anyone has done this, I'd appreciate some input.
 
Not to hijack your thread Zippy, but since you are in the market for a new clutch pack, I figured I'd raise the topic.

Has anyone with an older 821 ridden a newer 939? I noticed when flipping through the parts fiche for the 939 that Ducati drastically redesigned the clutch assembly inside the 939 motor. I wonder if any of these parts can be retrofitted into an 821 to address the grabby feeling many of us are having.

Maybe I've gotten used to it by now, but I did go for a short ride across town with my Father last week. He's been riding for 20+ years, currently has a Hayabusa. Anyways, he was on my hyper and managed to kill it twice pulling away from stops. So while I no longer have issues, I can definitely see it's a problem.

Edit: Here's what I mean. 821 Clutch Diagram:

yBke3dC.png


939 Clutch Diagram:

boOjquv.png
 
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I have wondered about this too. The clutch is really weird on this bike, and any of the other bikes I've ridden the clutch is super linear and easy to use. I did find that the type of oil makes a big difference. The Motul 7100 10w40 works quite well right now.

There was supposedly an update to the 2013's clutch. The design of the clutch itself is going to lend itself to poor modulation because you essentially have two engage/disengage ramps working at the same time due to the slipper action, and they compound each other.
 
zippy49 said:
I've been caught by that grabby clutch too many times. If the revs are just a bit too high or I let it out just a bit too quickly I end up stalling the engine half the time.
Click to expand...

That difficulty in launching the bike smoothly also annoyed me on my 821. You may not have to change the clutch to improve it. The problem disappeared for me after I changed the front sprocket to 14 tooth, but because the gears will be shorter then you still won't beat your buddy on the Streetfighter.
 
monocog007 said:
Not to hijack your thread Zippy, but since you are in the market for a new clutch pack, I figured I'd raise the topic.

Has anyone with an older 821 ridden a newer 939? I noticed when flipping through the parts fiche for the 939 that Ducati drastically redesigned the clutch assembly inside the 939 motor. I wonder if any of these parts can be retrofitted into an 821 to address the grabby feeling many of us are having.

Maybe I've gotten used to it by now, but I did go for a short ride across town with my Father last week. He's been riding for 20+ years, currently has a Hayabusa. Anyways, he was on my hyper and managed to kill it twice pulling away from stops. So while I no longer have issues, I can definitely see it's a problem.

Edit: Here's what I mean. 821 Clutch Diagram:

yBke3dC.png


939 Clutch Diagram:

boOjquv.png
Click to expand...
Has anyone compared the 2 clutches? I'd be curious up the road when replacement is needed.
 
appliance821 said:
Has anyone compared the 2 clutches? I'd be curious up the road when replacement is needed.
Click to expand...

Sorry that I hadn't seen this previously. Those assemblies are completely different. I will ask my dealer about his when I take the bike in for it's 9K service in a month or two.
 
I did it

I finally put that f**king clutch issue to bed. Installed a used 2015 clutch. If you have a 2013 or 2014 this is the way to go. Now I don't look like I'm learning how to ride a motorcycle anymore.
The parts fiche indicates that there are three different part #'s from the original. But the only difference is the discs.
You'll need to make a couple of special 3 mm x .5 bolts to hold the whole thing together.

Bodd4BeNn7veYsusZt4v6jtDOM6CYMO6O41XzHM3deOWZoIawkVVYXVMYjNs6W0FkwXjLQxBXBxsRH8DkCoP3LxcZ9nbEpzgX9UtzPqI7yCqyFCa52pbc6y4HJywlQ0JsmjYWimvtO9L4hT7TyWpJe9oA7Kw7IWOmaC0T1yoiybb3Ntz03CD5cfOrG_ZqpmnZGlozHSV_mhhyb61RhE5MkPY7lGzf3obboFa1nvWjoBnWKb4CNKbPTdlOkh3xcAX7P-1xLhCDYoiO1S1GdJIsh8MK8c6aXjF12AD1GNSLr152Rpiz4X3E4JhaSe1PxqxMdtqKgGtWQNVUXZ8NUl3-CFLvKXXX7sU1BYdebruWByvLC02Yh8pBJdBHKGtYZkaDIL3cQqDsLnqGIuMcalYbQ9l4SBdIpElg1ZTXr8Rvy5lcWTmvbrnc76oDSUQ1oxukaDofCj3CGl5WK2iZCtaVHGEA_q4x1R8zNgjOTrVOwnFpX-GZ2vkWdO1GR-dYwzgeds6wdXKCb4DGpbHpD2ufJyermHTgOd3jN1oH9qlRMqSlVjjZFEGtbYq8dY-ozsZRrC8npF9AX7o8EFxPCbdYEONuVXoFE7D71NSQ8yCk8S02g=w1254-h1037-no


--------------------------------------------------------------------------------------------
Rallye Crazy!
 
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The first diagram is for a 2015 clutch. The plates are different from 2013 -14. 2015 plates fix the problem. Actually in looking at the 939 diag. it doesn't look like a slipper clutch
 
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fredgilb said:
The first diagram is for a 2015 clutch. The plates are different from 2013 -14. 2015 plates fix the problem. Actually in looking at the 939 diag. it doesn't look like a slipper clutch
Click to expand...

Your photos that you attached don't seem to be working for me.
 
Here's a pic of the 2013/14 clutch assembly. Note that the 2015 has two "anti-judder" rings on the inner end of the clutch pack, that's going into my Strada next month.

Okay, now I've made a list of changed parts. The new part numbers are:

Clutch Disc Set: 19020312A (last three numbers completely different from 2013)
Plate Holder Hub (inner): 196106601B (only the last letter changed)
Pressure Plate:19420573B: (next to last number changed).

Of course the parts diagrams only show the change in the disc set.

And the parts cost, total, exceeds $1000. Lawdy Mama!
 

Attachments

  • HYM_MY13_clutch parts.jpg
    HYM_MY13_clutch parts.jpg
    97.7 KB
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zippy49 said:
Here's a pic of the 2013/14 clutch assembly. Note that the 2015 has two "anti-judder" rings on the inner end of the clutch pack, that's going into my Strada next month.

Okay, now I've made a list of changed parts. The new part numbers are:

Clutch Disc Set: 19020312A (last three numbers completely different from 2013)
Plate Holder Hub (inner): 196106601B (only the last letter changed)
Pressure Plate:19420573B: (next to last number changed).

Of course the parts diagrams only show the change in the disc set.

And the parts cost, total, exceeds $1000. Lawdy Mama!
Click to expand...
Thanks for collating this. Did a quick search just on the clutch plates and you can save about $100.00 by ordering from Europe. Keep us posted as you progress.
 
appliance821 said:
Thanks for collating this. Did a quick search just on the clutch plates and you can save about $100.00 by ordering from Europe. Keep us posted as you progress.
Click to expand...

Barnett has them for $239, to fit the Monster 821. However, they don't seem to include the two anti-judder rings. I will call them later to find out for sure.

I'd hate to think that those little rings are worth >$200....:(

Update: Yes, those rings are not included. However, if enough owners were to call or email them about this they might make them.
 
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Could we simply buy a judder spring and add it to our existing clutch pack? I wonder why Ducati didn't use one in the first place... they seem pretty common on most bikes.

It appears to just be a giant thin belleville washer, to add a little more displacement and cushion to the clutch engagement.

If someone measures the diameters and thickness of the 2015 judder spring maybe we can find another one that will work just as well.
 
kuksul08 said:
Could we simply buy a judder spring and add it to our existing clutch pack? I wonder why Ducati didn't use one in the first place... they seem pretty common on most bikes.

It appears to just be a giant thin belleville washer, to add a little more displacement and cushion to the clutch engagement.

If someone measures the diameters and thickness of the 2015 judder spring maybe we can find another one that will work just as well.
Click to expand...

To use a judder spring though, we'd need an extra friction plate to match the outer diameter of the judder spring, correct?
 
kuksul08 said:
Could we simply buy a judder spring and add it to our existing clutch pack? I wonder why Ducati didn't use one in the first place... they seem pretty common on most bikes.

It appears to just be a giant thin belleville washer, to add a little more displacement and cushion to the clutch engagement.

If someone measures the diameters and thickness of the 2015 judder spring maybe we can find another one that will work just as well.
Click to expand...

That's a good question. The parts fiche includes the plates and judder springs as one part, but I wonder if a dealer could get the judder springs separately.
 

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