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  1. C

    Merc HP500 cooling

    My boat has a Hp 500 carb. My question is does anyone know a way to run less water through the exhaust (to make it louder) but still have enough to cool the gill headers?
  2. C

    Mercury 50 runabilty prob

    I have a Merc 50 4cyl serial number 5797774 1980/81. My problem is the engine will only run with the choke on and will not idle. I've rebuilt the carbs/fuel pump/compression is 130 to 135 I've also ruled out primer bulb gas tank and connector. with it running I can spray carb cleaner...
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