I cannot seem to richen up the high speed mixture on my Saito 180, although it's like 4~5 full turns out from fully closed. It will run adequately at 4~5 turns out, not lean, not rich. But it makes me a little nervous. I even tried the oscillating pump, and it still cannot richen up. My tank is at same level, just 7" behind the carb. My idel screw is about 3 turns in from flush. I did open it to flush and try the high speed, but it didn't make a difference. I have about 1 gallon through already. Does anyone else have this problem?

By the way, how much can I turn out the oscillating pump? They say out is more. But is there a dead stop when I turn it out the max turns, or will I just unscrew that thing altogether?