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You are here:Home > "Mark" Models > Mark 55 > 1955 Thunderbolt 40hp (831021 thru 899949)
1955 Thunderbolt 40hp (831021 thru 899949)
  Manual
  Carburetor
  Electrical/Ignition
  External Parts
  Fuel Tank
  Gaskets
  Lower Unit
  Paints
  Powerhead
  Top Cowl and Starter
General Information:


  • This model is most often seen in "Mercury Green" & "Dull Aluminum" (pictured above) or "Sunset Orange" & "Sand Tan." It could possibly also have been produced in "Sarasota Blue" & "Sand Tan" or "Marlin Blue" & "Gulf Blue".
  • Model & serial numbers were on the instruction plate riveted to the swivel bracket above and between the clamp screws..
  • Serial numbers 831021 thru 899949 were 1955 models.
  • Mark 55 models were Manual Starting.
  • Electric Starting with Alternator Mark 55E models were also produced.