Have just got my new SE Stage IV kit installed on my Street Bob 2008. It has been installed by some very experienced engine builders/tuning people. The problem is that they can not get it to run as it should even after spending a lot of time trying to tune it correct. Acceleration is great, top hp and torque also, it runs a bit uneven when cruising. The problem is to start it, especially when cold. It does not start without giving a lot of throttle. They can not get it run run good on low rev, it sounds like it chokes it selves. They are speculating that it can be cauesd by the 58mm throttle body, that it is to big. It is a kit so it should work. Any ideas? Appreciate all support.