So I just bought this 660 and cleaned the carb out. Has 142/146 mains and 22.5 pilots. Also has an exhaust but the air box is stock with a lid. I’m getting a tumble/stutter/bogg right at a 1/4 to 3/8 throttle. Seems like when I punch the throttle it does it more but if I easy I to it and pass 1/4 it runs great. I’m guessing I need to go to a 25 pilot jet. Anyone have any thoughts on that? Thanks!!!