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    Merc 500 Carbs...How far to go?

    Re: Merc 500 Carbs...How far to go? I have my carb repair kits, and am lining up the correct parts, and have come upon a choice. For the record my motor is a Merc 500, 50 and the serial is 4418971. There are (2) inlet needles in the kit. I have attached a photo of the (2) provided needles...
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    Merc 500 Carbs...How far to go?

    I have a (circa) 1976 Merc 500, 50 OB. Last year (With some great Forum help) I rebuilt the fuel pumps and water pump, and replaced the majority of the disintegrating engine wiring and all of the fuel line components. It was running fine in a barrel in the driveway, and last week I decided to...
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    Merc 500 Water Pump Base REALLY STUCK

    I have recently been working to rebuild my circa 1976 Merc 500, 50 (Serial 4418971) water pump. When I took it apart, as expected the impeller was old and thrashed. I should say that I have owned this motor for about 12 years, and I run it every year but only for about 2 hours a year, so it...
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    Fuel Line Part Substitute?

    I have a (circa) 1976 Merc 500, 50 OB that I want to rebuild the fuel pumps on. The dual-carbs are the Integral Fuel Pump Type carburetors. There is a 6" rubber fuel line from the quick-connect on the engine case to a "T", and (2) 3" rubber fuel lines from the "T" to the (2) fuel pump intakes...
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