I have a 99 900rr to the gravity fed petock, when I got the bike it did not come with the petcock. Picked up what I beleive is a 94 from a friend not knowing there was a difference between the 2 How can I tell which I have? mine has 2 ports on it one for vacuum and one for fuel if that helps...

 

The stock petcock has 2 ports 1 for engine vacuum and the fuel line