What is the stack height with cushion for the Hayabusa?

The Clutch Cushion kit should be assembled exactly as the instructions indicate, with the correct number steel/fiber plates and our green and purple springs correctly installed, as shown in the link below.

Reference: 7 thin and 2 thick steels/7 thin and 2 thick fibers, all within the stock minimum thickness requirements per the service manual. Once this is accomplished, the stack height DOES NOT MATTER as the static spring pressure (550 lbs.) of our kit far surpasses any variance the stack height could affect as far as clamping pressure is concerned.

REFERENCE: Clutch Cushion and Lever Cam Installation Instructions

The video below can be used as a guide for all motorcycles. We used the featured bike for demonstration purposes, but this technique can be used to inspect/tune almost any motorcycle clutch. Start watching at 29:15 minutes.