This Mikuni jet is identified by the numbers 568 being stamped on it but you may also find that there are other needle jets that though having a different series number stamped on them, are in fact identical to the 568 and thus interchangeable. The Mikuni 568 series are used in our RS34, 36, 38 and 40mm carb sets as well as the TM40-6 and TM36-68. These Mikuni NJ’s use a N100.604 round type main jet which is a different thread and sizing scale than the Hex type main jets.
The lower the letter and number indicates the leaner the jet. Example N-6 is leaner than N-8. These are in 0.01mm increments and the 1/2 size 5’s are in a 0.005mm increments. Only the shown sizes are available.