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I found it on one of the GSXR drag racing sites, but they provided no backup for their numbers. Many people used a generic 2", but all of them were using the Brocks cover, so I discounted them. I have it all together at 1.920" and it seems to work well, but I had freshly soaked frictions and I never compressed it and remeasured, so I know some oil oozed out to bring it south of that number. I also found nothing in the 2005 manual for stack height, just only listed three thickness steels. My clutch kit came with all three clutch thicknesses.Where did you get that stack height? I can't find any mention of it in the service manual, including other years. Page 3-96 mentions the use of different width outermost driven plates but I don't see any mention of what determines the thickness to be used. Either I'm missing something or the manual needs to be beefed up there.
I've seen 48.18 measured on a K8, 49mm +/- .2mm mentioned, and "Factory specs are 1.885"-1.890" (47.88mm-48.06mm)" for K1-K4. But I can't find any statement by Suzuki.
The clutch mod instructions assume that you have a properly functioning stack and just instruct you on the removal & reinstallation of it. It could also use some beefing up on checking the stack height (or whatever else is appropriate) during reinstallation.
That is the same thing we are discussing. Which of the 2.0, 2.3 or 2.6 should you use.As I understand it, you should have two thicknesses for the drive (friction) plates. However of the thinner plates, eight should be one part # and one should be another (all nine with the same thickness). But there should be either one or two thicknesses for the nine driven (steel) plates. I think the Suzuki kit comes with nine 2.3 mm, one 2.0 mm, and one 2.6 mm thick driven plates, of which only nine are used.