ORIGINAL: gunfighterII
Sport,
I had to go get my instructions and here's what they say, advance throttle arm to full open position, the engine should now be running excessively rich, if not, turn the adjustment screw until a rich mixture is acheived. Now lean the engine by turning in the HS needle until max RPM is obtained, next adjust the idle by closing the throttle arm and adjusting the idle mixture disc.
I have to respectfully disagree with you again as it says that right in the instructions, they make it sound like you can adjust the screw and change the mixture setting. Ain't gonna happen.
I've always viewed the adjusters on the Perry pumps as volume controls, not pressure controls. Consider the instructions: The idea is to make sure that the pump is delivering enough fuel to let the engine run over-rich when the high speed needle is adjusted for that condition.
CR