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  1. K

    9.9 / 15 hp gear ratio

    What is the gear case ratio for late 1970s to 1990s? I want to correlate engine RPM to prop RPM.
  2. K

    HP & Torque Curves for 9.9 & 15 hp

    Anybody have these? Explanation: Am buying a kicker. Have seen many posts saying the increased power of the 15 hp is only at top end, resulting from increased max RPM. Since aux motor will probably never run at 5,000+ RPM, there doesn't seem to be any point in buying the 15 hp. If I...
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