N8 (168) The needle itself is SF-21 Mike knew right away that set up was wrong. I have no clue, never had to change needle and needle jet.Sounds like you're on the right track. Other terms for the needle jet are "emulsion tube" and "atomizer." The carbs would have come from Mikuni with N8 needle jets. Curious to know what size you found in there. Good that the float levers were unmolested. I'm sure the pic is meant to show the parts measured and the measurement taken, not the procedure you used, and that you didn't measure from the top of the flange instead of the gasket surface; we don't want to mislead the unknowing.