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    1988 Mercury Black Max Compression and Leakdown Readings. What now?

    Hello All, I have a 1988 Mercury Black Max 150, Serial Number B251261. The engine is running, but it is rough at low RPM (below ~ 3000 RPM),it isrunning good at high RPM and I think it has full power at top end. The roughoperation in the low range is bothering me. Lots done already: Carbs...
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