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  1. R

    what year is my merc?

    this is a 7.5 hp with thunderbolt ignition, it has two blue lines around the head. and a #75 on the head. I would also like to know what the gas oil mixture is supposed to be.
  2. R

    lower unit won't go back in

    I have a 1970 something merc 7.5 horse thunderbolt. took the lower unit off, now i cannot get it back on. the shafts won't line up.
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