38.5 mm

 

Thats what I was thinking, thanks for that visual.

I am just worried because I have been going through barnett clutches like every 500 or less miles. I am pissed that my new slipper came with these plates.

I hope I don't have a problem in the future. Would getting caught in the rain one time ruin these plates? Just trying to figure out why the barnetts were burning up.

 

Also, in the diagram it says Curved plate #3 - that is the thinner black 2 plates, one curved, one straight that was included, I see that. But also the kit comes with 1 friction plate the is smaller than the rest, thinner. Where does this belong?

 

just more info for your records.
BellissiMoto - Ducabike Clutch Install

my 6 spring ducabike "race special edition" with new kevlar plates n all is on the boat from Italy right now. I hope I dont go through these every 500 miles like you.

 

This stack order is for the OEM clutch plates, not the barnett, correct me if I'm wrong.

 

the top is the curved plate (white dot) and straight plate (used together)

the bottom left is the standard friction plate

the bottom right is the smaller thinner friction plate, where does this go?!?!

 

I believe the stack height needs to be 36.5mm not 38.5.

 

Maybe different manufacturers use different clutch stacks and heights? I know my OEM slipper and the NGR I replaced it with both are 36.5.

 

I run a Ducabike. 36.5

 

Also the spring caps will influence spring preload, ducati alone has three different heights.

So pack height, spring stiffness, spring preload, spider spring spec and ramp angle will affect slipping, so its a jungle unless you have complete kit fitted that has already been tried out.

Ive never seen a pack with less than 36mm, so you should probably stay above that.
I just did a monster 1100 with DP slipper and oem discs along with the caps that gives the lowest preload, no clue what bike it was for, customer didnt know either, I had to choose from 37.0 or 39.0, so this guy was new at tracking and had no clue what to expect so I picked 37 to have it slip a good bit. Went for a testride and it slipped right away in first gear even, and thats where preference come into play, I would think thats too much, but some like to see their money invested delivers, so he was happy with that.

The stack height in this case doesnt tell you anything meaningful unless you know all the other factors I mentioned.
I like the least amount slipping while still being able to dump the clutch and not upset the chassie to a point of losing control, with my setup stack height is 39mm.
General tip would be, if you like two stroke engine braking go 36.5 if you just like to shut the pulses from the engine out and use the clutch manually 38.5-39mm.

OEM packs typically comes at around 40mm (compressed in a vice), so one disc out usually gets you in the ballpark for a slipper.

 

Ahh I see, still whats the deal with that thin friction plate the barnett comes with? where does that go?

 

No idea, never seen one until now.
Implies something bigger than the hub in diameter to overcome, the black ones in post #6? What are those?
Possibly theyre supposed to interact with that disc.
The black ones may be feathered discs and the thin one on the outside, thats the best I come to think of.

With no other information Id try a pack height of 37-38, having one or two black and the thin go in together at slot three.
Friction disc most inner! A steel may drop down as the support will be lost if the hub moves out far enough.

 

I just installed the clutch pack as instructed by barnett, and of course it slips really bad, also clutch lever feels like hell, not disengaging all the way. What could be the issue

 

If your plate stack height is correct, someone may have pulled the clutch lever when it was disassembled and extended the slave piston and pushrod to the max — holding the plates apart. Open the bleed valve to relieve fluid more quickly and allow the slave and pushrod to retract. Make sure that the pressure plate lines up correctly with the marked spring location. Check that your reservoir fluid level is below the MAX line.