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    66 Merc 500 Questions

    I am replacing the water pump and have some questions that I hope someone will answer. When I put water directly into water tube in driveshaft housing, no water exits through the tell tale hole on side of motor. It does exit out the top hole with the plug removed so I know water is getting to...
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    Water Pump Issue

    I have an old Merc 500. With the muffs on and the motor not running, can water still flow through the pump and if so should there be a stream from the pee hole. I dont get any water stream from the pee hole when it is running and I'm reluctant to run it for any length of time until I replace...
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    Water temp magneto ground.

    I have a 1963 Merc 650 that has a temp sensor on the water jacket that grounds the mag (at least I assume it will if I ever get it running). I also have a 1966 Merc 500 that has the location for a sensor but no sensor attached. Did the 50 originally have one? I kind of like the idea of a shutoff...
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    No Idle but lots of RPM's

    I finally got the old 50 running. She's a 1966 magneto ignition 500. [I] rebuilt the carbs and fuel pump, set points correctly to .008and replaced a bad condenser and she jumped to life. The problem now is absolutely no idle. Once she starts she revs up to something a lot higher than 600-700...
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    1966 Merc 500 Starting Issues

    Hello, I'm attempting to bring an old Merc back to life and could use a bit of assistance. I have rebuilt the fuel pump and carbs. Compression is 145 on 1,2 and 3. Cant get in to #4 but am assuming it's the same. Point are not new but looked very good, no arcing showing. The manual calls for...
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