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  1. 1

    1979 70hp thunderbolt original prop size

    I am trying to understand the correct prop size. Does anyone know the original prop size? I don't know if the prop that's on there is the best choice(10 1/2 x 14) I was out pulling a tube yesterday and it didn't get very good top speed. The prop needs to be replaced regardless since it is...
  2. 1

    Horn is silent

    I am going batty trying to get the horn to work. I get power to the new switch. I get power past that to the horn. Nothing works. The switch seems to get real hot, real fast. I am obviously missing a step. Any suggestions??
  3. 1

    My outboard serial number is not listed??

    I am trying to verify the year of my Mercury Thunderbolt 70hp. It's not listed on the webpage here with all the serial numbers. Wondering if anyone can help me 5465802
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