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DB2 Clutch inspection

 
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welshlamb



Joined: 09 Mar 2011
Posts: 266
Location: South Wales , Nr. Abergavenny

PostPosted: Mon Apr 17, 2017 9:20 pm    Post subject: DB2 Clutch inspection Reply with quote

When I bought my DB2 I thought the 'take up' on the clutch was aggressive i.e. 'grabby'. I only did a few hundred miles last year and after a couple of 20-50 mile runs recently I thought I should take a look as it was no better.

This is the 'stack' of plates from my bike.



The eagle eyed amongst you may notice that there are 9 steel plates and 8 friction plates. Overall stack height is 37mm (manual doent give a value for this 'as new).

My Haynes 900ss manual suggests Post 92 model should have
2 off 2mm plain plates then...
Friction plate then...
1.5mm friction plate (dished and marked with a dot?) then
alternating friction plates and 2mm plain plates... finishing with plain plate

Unfortunately it doesn't say how many.

This pic from Gowanloch ducati suggests 10 plain and 8 friction??



Also in my current pack nos 1, 3 and 9 (outside) plates are 2mm thick and all the rest are 1.4mm thick.

As all the friction plates are 2.8mm (ie absolutely on the Haynes manuals wear limit) then they are I assume 'toast' although some webistes cite 2.5mm!! I cant actually see any blocks of friction material on the discs so assume it was a continuous band of friction material? (not like pics of ducati plates I have seen)

The steel plain discs are all coloured but feel smooth to the touch (I cant feel anything with dragging a fingernail across them).



There is no wear to the drum faces where the friction plate tangs engage (The drum is an aftermarket alloy item) or in the teeth of the inner drum (good!) Reading other sites it seems that with the aluminium basket I should use aluminium based friction plates (as fitted as standard on later 900ie I believe)

What is the correct sequence and number of plates?


any thoughts welcomed.
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Joined: 22 Oct 2007
Posts: 457
Location: Stafford, UK

PostPosted: Mon Apr 17, 2017 11:30 pm    Post subject: Reply with quote

Hi

No knowledge of the internals of the Ducati clutch, but logically shouldn't there just be at most 1 difference in the number of one plate or the other?

All the best

Katy
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Weed



Joined: 29 Dec 2013
Posts: 137
Location: Perth Australia

PostPosted: Tue Apr 18, 2017 12:36 am    Post subject: Reply with quote

Go to http://www.ducati.ms. Do a search, there is a lot of info on clutches on that site. The Gowanloch stack is correct but different steel plate thicknesses are used to get the correct stack height. No need to be to pedantic on the heights though. Also there are variations with concave steels as well.
The grabbing is a common issue & this can be cured by heating the friction plates, applying a grease & wiping off the excess. Strange as it seems, it does work.
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vort28



Joined: 22 Mar 2010
Posts: 1782
Location: Northwest , UK

PostPosted: Tue Apr 18, 2017 8:29 am    Post subject: Reply with quote

Hi Welshlamb.

Not sure of your experience with Duc clutches , but they are all grabbie to some extent, part of the dry clutch character !!
Very Happy Shocked
What type of alloy basket is it ? Has it got the steel retaining band or not ?
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welshlamb



Joined: 09 Mar 2011
Posts: 266
Location: South Wales , Nr. Abergavenny

PostPosted: Sat May 20, 2017 9:57 pm    Post subject: Reply with quote

Took the clutch into CJS racing near Bristol (independent Duc specialists) whoo took one look and said that steel plates and continuous friction material were really for racing apps and not suited to road use (explains the VERY grabby nature).. Say they have tried many different clutch packs but keep coming back to Ducati OEM. Riders in Bristol had a 749 pack in stock which has the right alloy plates and friction pads. Installed and hopefully that will cure the issue.

Have also fitted Oberon slave




and taken opportunity whilst the Bims 'clothes' are off to change to Cycle Works coils and Exact heavy duty battery/solenoid/earth cables to try and improve the knife edge starting! Should have it running again this week. (little did I know!!)
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Last edited by welshlamb on Mon May 29, 2017 9:21 am; edited 1 time in total
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brian



Joined: 22 Aug 2011
Posts: 2408
Location: QLD, Australia

PostPosted: Sat May 20, 2017 11:15 pm    Post subject: Reply with quote

Good news on the clutch, interested to hear what the difference is when riding. I've been going to buy an Oberon slave for my DB4 but haven't got round to it as yet. They are meant to be a nice unit.
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