It does say but if I remember right 142 on the outside and 140 inside or it might be the other way around (a lot of help ha). If it is jetted up, I wouldn't change it until you rode it with the stock pipes. From the factory, the Bird had a dip in the power curve around 5,000 rpm and the jetting seemed to help it. Pete from Pa is the jetting expert around here, maybe he will chime in.