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  1. colsan

    4HP mercury parts identification

    I'm looking at a 4 hp mercury top end only (no leg so no model number) on ebay, I've found out it has a switch box thunder bolt 2, part number 247 7483. Any ideas what model 4hp merc this is off? I have contacted the seller again, the switch box s/n is 339-6222A8, the same as mine, not as...
  2. colsan

    No spark 4hp Mercury 1978 model Twin cylinder

    I have no spark at the spark plugs, I purchased new plugs & still no spark. there is a reading within specs on the ohm meter on 2 wires coming from trigger assy (brown & white) under the flywheel & going to the switch box (Thunderbolt 11) but no reading on the wires going from switch box to...
  3. colsan

    What year is my 4 hp mercury

    I would like to find out what year this motor is, it is a blue band twin cyclinder motor, serial number 9 188880. colsan
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