The secondary shoule "float" from side to side. On the 900 there is no clutch alignment so thats why it does that to align itself. Take a look at the stickies there is tons of info on how to set this.
I have read much, and i hear allot about making sure your clutches are aligned. Read different tightening sequences of front mount, pto first, rear left, next,, then,, etc.. And checking alignment while doing so... So i bought the alignemnt tool made for this sled. This alignemnt tool came w/ spec's of gap for TSS-98 clutch,, which is stock. .040 gap required.. gives feedback in instruction to loosen mounts, shim, retighten then measure,, do again if off till gap is reached.
This clutch, 2ndary,, has push in and out,,,, slop.. Im asking do you push in till bottom out,, then measure,,,, or pull it out then measure against tool....
I may no know everything,, but i know this 900 clutch needs to be aligned,, and yes,, the slop to to aid in alignment as the motor rotates from torque... but there is a start alignment to this, and thats what this tool is for.