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1987 Merc 9.9 vs 1996 9.9 Carb specs

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  • 1987 Merc 9.9 vs 1996 9.9 Carb specs

    I have both of these motors. The 87 has a .52 main jet & WMC23 carb. This carb has a bigger venturi than on the 1996 which has a .48 main jet. The 87 is the 12 cu Powerhead and the 96 has the 16 cu inch. The 87 9.9 seems to have more top end speed.

    Why would the 95+ 9.9's have a smaller carb and main jet with a larger powerhead??
    1989 Four Winns 170 Cobra 3.0

  • #2
    Maybe because the same motor is used for a 15hp? With a larger carb.

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    • #3
      Fair to say the 86-94 9.9's are faster than the 95+ models?
      1989 Four Winns 170 Cobra 3.0

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      • #4
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        I do not know about that but I have a 1995 20hp and my max RPM is 5500. If I was to add a carb from a 25hp it should turn at 6000 RPMS.

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