Do you mean the airbox ducts? If they are soft, it should be easy.
On my 81 650 I sometimes just push them into the airbox & reinstall from inside the airbox.
Often times it's suggested to remove the airbox bracket bolts to get a little wiggle room, but I never bother doing that.
If they're hard, you could cut them out. avoid damaging the airbox. A heat gun might help soften hard ones for removal.
I'm not sure if a heat gun could ignite gasoline, though.
1981 KZ650-CSR. Competition, Sports & Road.