What's the real deal with the "S" pilot jets (65s, 68s, etc)? I understand how they are physically different from standard Keihin jets (the "S" jets have smaller emulsification holes). What I don't understand is why so many people seem to use and recommend using "S" jets (68s especially) versus the standard jets (like a regular 68). I am under the impression that the "S" jets are strictly a Honda thing that is related to emissions, NOT performance. The reason I'm asking about this is because I'm using a 68 pilot jet with great results and I want to know why (if there is a reason) I should be using the 68s pilot jet so many others seem to be using. Thanks. ETA: I was gonna ask about the b53e needle but decided not to--yet my edited post title isn't showing up on the subforum list.