2002+ Mercury Mariner 150/175/200 EFI 2-stroke Factory Service Manual, Page 319Get this manual

2002+ Mercury Mariner 150/175/200 EFI 2-stroke Factory Service Manual, Page 319

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POWERHEAD
Reed Valve Opening Cylinder Bore

IMPORTANT: Using micrometer, measure dimension "B" at location shownDimension "B" should be 0.008 inor less than dimension "A"