I have 150 mains, 45 pilot, cgl needle in middle. I've tried 165's down to 145's. It sputters through the gears and then falls on its face in 5th gear. Its not a lean sputter. I have a pingle to so I really dont think its sucking the bowls dry. It ran good for a long time with the 150's. Starting to think its electrical but not sure.. About ready to say hell with it and take it to jeff, if he's got time.