Be prepared to hear it when ordering your needle and jets. I got it from Sudco when ordering a starter jet and a main air jet. (the starter jet they don’t carry by the way), and from my YAMAHA parts guy. Actually the guy at the parts counter will give you a look similar to the headlights on a deer expression, and ask why do ya need all that? It’s worth it though! If you’re thinking of re jetting, try it. If you’re in the process of re jetting, don’t give up! I think the biggest improvement to the bike has been the jetting.