Carb Cover Questions

I bought 4 black polychrome carb covers to replace the rusting chrome ones on my bike. When I take off the old ones, will I need to do anything to the carburettor 'settings' before or after putting the new ones on?

Thx

I'm speaking in referance to Mikunis (bad spelling?), it's just a cover. No changes.

If the look like the pic, then they're Keihin's.
There won't be any adjustments. But MAKE SURE the rubber diaphram underneath stays in it's little groove when you put the new ones on.

Thanks, I'll see how it goes & if there are any probs I'll let ya'll know.