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Old 02-Aug-2011, 21:55
jacknash jacknash is offline
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Help identifying this slipper clutch 998

Hi

This naughty lil bugger burnt out at Mallory after just 2 sessions. The bike is new to me so I will let it off this once!

Anyways I dont recognise it and it has no name on it or part number to google!





The following plates (S) with Friction plates came out (F)

1xS 2mm
1xS 1.5mm
1xF
1xS 1.5mm
1xF
1xS 1.5mm
1xS 1,5mm
1xF
1xS 1.5mm
1xF
1xS 1.5mm
1xF
1xS 1.5mm
1xS 2mm
1xF
1xS 1.5mm
1xF
1xS 1.5mm
1xF

TOTAL 37.5mm

All Steels are flat, no convex.

I need new Friction plates, unsure how many to buy as the 998 should have 6 Friction plates. Robbing Shazaams info, seems the 996S / SPS plates should work?

Haynes Manual: 748, 916, 996

7 friction plates - one curved plate with two friction surfaces

Minimum friction plate thickness = 2.8mm

2.0mm plain plate #1 2.0mm plain plate #2 3.0mm friction plate #1 1.5mm dished plain plate (convex side facing toward you) 3.0mm friction plate #2 2.0mm plain plate #3 3.0mm friction plate #3 2.0mm plain plate #4 3.0mm friction plate #4 2.0mm plain plate #5 3.0mm friction plate #5 2.0mm plain plate #6 3.0mm friction plate #6 2.0mm plain plate #7 3.0mm friction plate #7 2.0mm plain plate #8 pressure plate (line up marks)

38.5mm plate stack height

Haynes Manual: 916SP, 916SPS, 996S, 996SPS

8 (thinner) friction plates - two curved plates with one friction surface each

Minimum friction plate thickness = 2.3mm

2.0mm plain plate #1 1.5mm dished plain plate #1 (convex side facing toward you) 2.5mm friction plate #1 1.5mm plain plate #1 2.5mm friction plate #2 2.0mm plain plate #2 2.5mm friction plate #3 2.0mm plain plate #3 2.5mm friction plate #4 2.0mm plain plate #4 2.5mm friction plate #5 2.0mm plain plate #5 2.5mm friction plate #6 2.0mm plain plate #6 2.5mm friction plate #7 1.5mm plain plate #2 2.5mm friction plate #8 1.5mm dished plain plate #2 (convex side facing away from you) pressure plate (line up marks)

38.0mm plate stack height

Ducati Service Manual: 998

6 friction plates - one curved plate with two friction surfaces

Minimum friction plate thickness = 2.8mm

2.0mm plain plate #1 1.5mm dished plain plate (convex side facing toward you) 2.5mm plain plate #1 1.5mm plain plate #1 3.0mm friction plate #1 2.0mm plain plate #2 3.0mm friction plate #2 2.0mm plain plate #3 3.0mm friction plate #3 2.0mm plain plate #4 3.0mm friction plate #4 2.0mm plain plate #5 3.0mm friction plate #5 2.0mm plain plate #6 3.0mm friction plate #6 1.5mm plain plate #2 2.5mm plain plate #2 1.5mm dished plain plate (convex side facing toward you) pressure plate (line up marks)

38.0 mm plate stack height

Stack Height

A too-high overall thickness of the plate stack will cause drag between plates when the clutch is disengaged making it difficult to select neutral when the bike is stopped.

The last 2mm steel plate can be interchanged with a 1.5mm curved plate facing away from you if you want to adjust the stack to get the 38mm stack thickness, or if you want a more progressive, soft clutch engagement. A commonly-used substitution that adds an additional spring plate to the stack.

Any of the steel 2mm plain plates can be exchanged with 1.5mm plain plates to reduce stack thickness or increase stack thickness as needed to achieve your desired overall height. You will see the need for this as friction plates wear, so keep your steel plates from pervious clutch replacements as spares to be used as height adjustments later. The 2mm and 1.5mm steel plates only need replacing if they’re scored or warped.
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  #2  
Old 03-Aug-2011, 01:22
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DSC Region Organiser skidlids skidlids is offline
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Slipper clutches have a different build order to the normal clutches so whats in most manuals doesn't apply

Can't see why the two steel plates are together, not good for a slipper clutch, can't tell which order they came out in, did the two steels come out first or last.

as for convex plates, not having one isn't going to help and in the ones I use on track I usually use two, although I have known some racers to use a total of 4 convex plates

Getting the end gap right is also important


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Old 03-Aug-2011, 10:19
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Chaz Chaz is offline
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Nothing wrong with 2 steel plates together(they don't spin against each other) you sometimes need to make up the pack thickness, 37mm on that clutch, starting with a friction plate & finnish with a steel you should have a least 1 dished plate.
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Old 03-Aug-2011, 22:02
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smilo006 smilo006 is offline
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ball and ramp or just ramp?
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Old 04-Aug-2011, 00:27
jacknash jacknash is offline
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Hi thanks for info. Not sure if ball n ramp, need tool to get basket off! So if I get at least one dished plate (where?) And same number of friction plates and build to 37mm the job should be a goodun?
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Old 04-Aug-2011, 00:32
jacknash jacknash is offline
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Steels under pressure plate
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Old 04-Aug-2011, 01:11
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If it was my bike I Would still rather dump the extra 1.5mm Steel and change 3 of the other 1.5mm plates to 2mm, you have the same overall pack thickness


This is how I see it

Lets assume a clutch lift of 3.8mm
Your setup had 19 plates so thats 3.8mm/19 = 0.2mm gap per plate

I would rather have 18 plates so that you get 3.8mm/18 = 0.21mm gap per plate

Might not sound a lot but that extra 0.18mm of clearance across the pack can help reduce drag and the risk of cooking the clutch


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Old 06-Aug-2011, 22:25
jacknash jacknash is offline
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hi skidlids, thanks for your reply. Looking at the Barnett kit does it matter what model I buy it for? I believe the ST4S uses ally plates? Any idea if the 'full' kits also include the dished plate or is that a ducati only part?

Roughly hw many TD's can I expect from a clutch, I am not too harsh however I will 'use' the slipper as god intended!

thanks, jack
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