1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 140Get this manual

1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 140

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EMISSIONS
Exhaust Emissions Standards What Are Emissions? Hydrocarbons HC Carbon Monoxide CO Oxides of NitrogenNOx Controlling Emissions Stoichiometric (14.7:1) AirFuel Ratio Outboard Hydrocarbo