It definetly has enough fuel thru it to tune it properly. OS is one of the easiest/best engines to break-in, but is it broke-in all the way, probably not. That ring is hard, and so is the cylinder, it may take some time to be perfect. Even if you run it a bit rich after you tune the low end needle, you'll still have good throttle responce. Once you are sure it is broke-in "let it scream".