Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 205Get this manual
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Table of Contents Page Exhaust Emissions Standards 30-1 What Are Emissions 30-1 HydrocarbonsHC 30-1 Carbon MonoxideCO 30-1 Oxides of NitrogenNOx 30-1 Controlling Emissions 30-1 Stoichiometric (14.7:1)