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Engine will idle fine at 1000 rps but when I back it down to idle it goes to 700 then 600 and bounces back and forth between 600 and 500 then dies. Restart and back up to 1000 fine. Changed fuel filters, pumps, and rebuilt carbs. Not sure of pilot screw settings, one manual says 1 1/8 to 1/4 on both sides and another is port 1 1/4 and stbd 3/4. Anyone know the real number for port and stbd?