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    1970 mercury thunderbolt 500 no pee

    Hi everyone, yesterday I took my old boat out of storage (engine did not run for 2 years). After hooking everything up the engine started pretty easily, I let it ran for a few minutes and then I revved it a little bit to make sure it was running good. No problem so far, the only thing is that...
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    1970 thunderbolt 500 rectifier

    Hi guys! I just got out of the lake I had a problem with my 50hp 1970 thunderbolt 500. I beached after a quick ride and after that the engine would not crank the battery was dead. After a quick inspection I saw that the rectifier and the wires that attach to it were starting to melt. the damages...
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    Thunderbolt 500 1970 Installation on new transom

    Hi everyone! I'm about to install my old merc 500 that I've got to run (thanks to this forum) on a 14' fiberglass boat. I rebuilt the transom and I want to know if anyone knows the bolt pattern for the engine? I'm gonna make some aluminum plate to put between the mounting bracket and transom to...
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    Thunderbolt 500 1970 crank but doesn’t start

    Thanks for the info! If anyone can help me to figure out the TDC that would be awesome :D I'm confused all the manuals say that when the line on the ring is aligned with the arrow, engine is a TDC. Does TDC means that the piston 1 is at the top of the cylinder (highest point near the spark...
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    Thunderbolt 500 1970 crank but doesn’t start

    Hi Everyone I am new to this forum and I’m looking for help to repair my mercury outboard engine it is a thunderbolt 500 1970. I picked it up in a barn it as not run for about 10 years that my uncle said . First thing I did was I pulled the plug and shoot some lube in all four cylinders and...
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