CB1100 Idle speed instability problem

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Speed if possible can you also unscrew the old piston, put it in the cylinder and take a picture or video of how it fits inside, in other words;
how much play does the piston have?

With a small piece of wire through the piston it should be simple to pull it back out after the photo has been taken.

And maybe compare if there is a difference in how easy it is to rotate the shaft with the permanent magnets of the old compared to the new iacv.

Recommend taking plenty of pictures to remind yourself how things fit and how cables/hoses are routed and connected, the fueltank breather hose
has it;s own shallow channel just beneath the tank so it does not get pinched and blocked when assembled again and i guess you've seen the
video concerning the fuel hose quick connector from iamheero, a small amount of grease on the pipe makes re-connecting very easy
for the o-ring to slip on.

thanks.