Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 267Get this manual

Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 267

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EMISSIONS
Controlling Emissions
There are two principle methods of reducing emissions from two-stroke-cycle marine engineThe first method is to control the airfuel ratio that goes into the