Convex / Spring / Wave Plate for Clutch?

sportbiker_kev

sportbiker_kev

Well-known member
How important is the spring plate (aka convex plate or wave plate), that goes in the mix of friction and steel plates in the clutch? I've read that it's not entirely necessary.

I don't have one in my new Barnett set, and my bike had the clutch stripped off it before I got it, so I can't reuse the original. My local dealer can't find a part number for a new one. They say it only comes in the new set of clutch plates, but I've read on the Ducati forum that you can order it separately from Ducati. I found this part number on another forum (067516530) - it seems to be for a 748/998, but my dealer can't guarantee me if it will work or not.

Any ideas/suggestions? What happens if I don't even use it? As long as the stack of plates is the right thickness, it's all good? I know nothing about clutches, but I'm learning...
 
is that not a plate that prevents the plates from sticking together?
 
Although your bike might seem to work fine without it, its supposed to be there. When you get an aftermarket clutch kit you are supposed to reuse those OEM spring plates...My bikes have one flat one and one convex, that go in first...

You can order those separately from a dealer.....If I were you I would order them!
 
WOW Ducati is box! You cant buy clutch plates separate, you have to buy them as a complete set....

And looking at the parts fiche for a the Hypermotard 1100 I dont see any spring plates on that clutch...I see 8 friction plates, and 10 steel plates....Rather then 1 steel at the bottom with a spring plate, it looks like they run 2 steels plates then a friction...
 
According to the shop manual, the order is: 2 steel plates, 1 friction plate, 1 spring plate, friction plate, steel plate, friction plate, steel plate etc.

But yah, you can't get just the spring plate separately for the Hyper. Someone on the Duc forum gave me a part number for the spring plate on a 748. Says it will work. I'll order it and hope for the best.

CLUTCH.jpg
 
Your clutch will work without it, but the clutch will drag.

You can put an O ring around the drive, one on each metal plate. Does exactly the same job.
Yamaha does that on TZs and I have been doing it for 35 years in clutch packs of auto transmissions.
 
sportbiker_kev said:
According to the shop manual, the order is: 2 steel plates, 1 friction plate, 1 spring plate, friction plate, steel plate, friction plate, steel plate etc.

But yah, you can't get just the spring plate separately for the Hyper. Someone on the Duc forum gave me a part number for the spring plate on a 748. Says it will work. I'll order it and hope for the best.

CLUTCH.jpg
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What was the cost of the Barnett compared to the OEM Ducati clutch kit? And do you like the feel of the Barnett?
 
sportbiker_kev said:
$200 shipped (from Ebay) vs. $500 for the Ducati one.


Probably won't know till spring - but I'll let you know then!
This is it's current state.....
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You might not like it! Especially if you use their springs if they came with springs.....Their clutch kits usually make the clutch pull much harder.....Not a fan personally...
 
sportbiker_kev said:
Even with a hydraulic clutch?
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Hydraulic or cable they still use springs for the pressure plate tension....Barnett usually supplies new springs that are stronger, if you use those stronger springs, your clutch pull gets harder....

Might not be as noticeable with a hydraulic clutch master, but stronger springs are stronger springs and will affect the pull

If it came with springs just compare them, like I said Barnett springs are usually much stronger....

Besides that Barnett friction material is a little too grabby feeling for me, for street riding....just not a fan of the feeling of their kits...
 
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I did get new springs from Barnett, but I'll have to use them because I'm missing some. When I got the bike, it only had 4 friction plates, no steel plates, and springs missing. Glad I took the clutch cover off before I tried to run it!
 
sportbiker_kev said:
I did get new springs from Barnett, but I'll have to use them because I'm missing some. When I got the bike, it only had 4 friction plates, no steel plates, and springs missing. Glad I took the clutch cover off before I tried to run it!
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Some people mix some Barnett springs with some OEM springs to lighten it up, if it gets too hard for their liking.....Track bike doesnt really matter so much, its playing with the clutch at lights and stop signs where the heavier pull gets annoying...
 
JohnnyP636 said:
Some people mix some Barnett springs with some OEM springs to lighten it up, if it gets too hard for their liking.....Track bike doesnt really matter so much, its playing with the clutch at lights and stop signs where the heavier pull gets annoying...
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+ 1 ....1/2 aftermarket 1/2 OEM springs works well if your trying to get a stiffer clutch......

OP: try a quick pull lever, with OEM springs, works wonders....
 
LittleSaki said:
cant that be converted to a cable pull?
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Not easily, although Im sure there are conversion kits out there ....If you really want to change the way a hydraulic clutch feels, you can change the master cylinder to a Brembo with a different size bore x stroke...And they also make billet slave masters that have different piston bore x stroke....Different combination's of bore x stroke will give you different feel....

Ive heard the billet slave masters make a nice upgrade to the Ducatis. Many brands to choose from these days
http://www.google.ca/search?q=ducat...&biw=1024&bih=572&sei= Zh60TtH2AsfZ0QG57rHDBA
 
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If you need a peek at another clutch,feel free to drop by and have a look at the muffin's.The pressure plate etc is off because i loaned a friend the pushrod.Pm me for any more info or contact #.
 
the convex plate is also known as a judder spring.
The clutch will work normally without it but the bike will make quite a noise as the clutch enguages.
I had a Harley barnett kit that had this missing - called them and they sent me the part.

Donald
 
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