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    1970 Mercury 500 running rough

    I have a 1970 Mercury 500 which seems to run very rough at high rpms. It will only get going about 5-10 mph and while doing so the engine shakes like crazy. So far I've cleaned the carbs, put new carb kits in new fuel lines and new fuel pump kit. After doing that it still ran rough and only went...
  2. 1

    1965 Mercury 500 shifting problems

    I have a 1965 Mercury 500 that will not shift. For some reason when the lower unit is on the outboard, it will not shift. Sometimes the shifter on the control box will get stuck and the lower unit has to be removed in order for it to move freely again. When the lower unit is off I can move the...
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