1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 72Get this manual
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CARBURETOR JET CHARTS STANDARD JET CHART
Main Vent" Idle Main Vent Idle Main Vent Idle
Instllil jet with lin orifice:
2500'5000' (762-1524m) 5000'-7500' (1524-22