Hey guy's, I have been fighting a top end running prob. for sometime now, she leans out (looses power) at full throttle, runs great at mid-range, I went through a lot of trouble and removed my center console to remove the fuel tank because I thought it had a fuel filter sock in the tank, NOPE, just a tube with a pick up screen that is not removable. I have done a lot to find my problem, ck for air leaks, replaced primer bulb, inspected vacume lines, cleaned carbs, replaced in line fuel filter, tear down VRO pump and inspect(looked real good, soft diaphragms) the oil side of the VRO was bypassed a long time ago and Joe Reeves confirmed that it was done correctly. I am back into the carbs to double ck my work and I noticed something, on the outside body of the carb at about 11 o'clock there is a screw, it seems to be an adjustment screw since it feels like a spring is behind it, the body that the screw is in has a small hole that is open to outside air, could this be a atmospheric port? if so, ALL 4 screws are completly closed, they are not removable if you back them out (or so it seemed, I did not want to forse them since the carbs are plastic. any advise on the purpose of these screws and anything alse would be nice, Thanks, Ron