If a bitcoin is worth roughly $6000 tonight, how does one sell a item is worth less then $6000 in bitcoin if the item is $4000?
Since this has already been answered, I'll skip to the thing that nobody seems to pick up from your question. Reading between the lines:
So I am brand new, and I am looking for things I have that I can sell to get a crypto wallet going.
If you have no idea how Bitcoin works, why do you want to sell your motorcycle for 0.6
BTC? It sounds to me like you want to jump in because you've heard Bitcoin went up a lot in price. And although that's true, I can highly recommend to learn how Bitcoin works before jumping in with $4000.
Crypto can be very profitable, but you should be aware of it's pitfalls.
You itself mentioned already answered and says repetitive answer this op and others dude. That is his problem whether he want to sell the bike for btc or fiat cash. Both would be money according to me btc users. He just asking conversion of bitcoin for the value 4k us dollars just check in Google and explain him that's it.