If your cap is like any of the caps on the assortment of Honda's I have had over the years, it doesnt take a "key" per-ce, It just happens that your key will operate it ... just as will any thing that will fit into the slot. Press down on the cap and turn the key gently. The latch should retract and the cap pop right off. The key will stay in the cap until you put it back on.
If yours is a latch on the side (I doubt it), same is true ... insert the key, press down on the cap turn the key the cap will unlatch
Having said that ... I must also say to you ... that is my experience with Honda caps in my country. I don't know where you are and it is not necessary for you to say where.
Here is a web site you may find interesting, BTW:
http://hrca.honda.com/
Good luck with your Nighthawk.
Thank you for your interest in FixYa.com
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