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?
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...
