Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 95Get this manual

Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 95

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SERVICE MANUAL NUMBER 24
Engine laboring Clogged flame arrestor Engine compartment sealed too tight Boat bottom

Not enough air for engine to run properly Dirty (marine growth), hook