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  1. R

    Mercruiser 3.7 MCM 165 not getting to operating RPM

    ok. What reading am I looking for when checking the compression?
  2. R

    Mercruiser 3.7 MCM 165 not getting to operating RPM

    Thanks for the reply. I should have mentioned that yes the ratio is the same. we took off a 1.84 ratio, 17/19 tooth gears and put on a 1.84. The boat is currently in the water so we haven't 100% confirmed the ratio yet but the person we bought from is very reputable and swears that its a 1.84...
  3. R

    Mercruiser 3.7 MCM 165 not getting to operating RPM

    I recently purchased a 1987 Four Winns 190 Horizon with a Mercruise 3.7 MCM 165 ( 4 Cylinder) and an Alpha One stern drive. While taking the boat out for the second time this season we were able to cruise around 4500-4800 RPM. However, while bringing the boat down from speed something in the...
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