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You are here:Home > "Mark" Models > Mark 55 > 1956-58 Thunderbolt 40hp (906752 thru 1152195)
1956-58 Thunderbolt 40hp (906752 thru 1152195)
  Manual
  Carburetor
  Electrical/Ignition
  External Parts
  Fuel Tank
  Gaskets
  Lower Unit
  Paints
  Powerhead
  Top Cowl and Starter
General Information:


  • 1956 models were produced in "Sunset Orange" & "Sand Tan," (pictured above) and likely were produced in "Quicksilver Green" & "Sand Tan" and "Marlin Blue" & "Gulf Blue." They may also have been produced in "Sarasota Blue" & "Sand Tan."
  • 1957 models were produced in "Sunset Orange" & "Sand Tan," and "Sarasota Blue" & "Sand Tan" and likely were produced in all "Charcoal" and in "Quicksilver Green" & "Sand Tan" (pictured above.)
  • 1958 models were produced in "Sunset Orange" & "Sand Tan", "Cavalry Brown" & "Sand Tan" and "Burgundy" & "Sand Tan." Other colors are possible as well.
  • Model & serial numbers were on the instruction plate riveted to the swivel bracket above and between the clamp screws..
  • Serial numbers 906752 thru 983919 were 1956 models.
  • 1025987 thru 1097499 were 1957 models.
  • 1134536 thru 1152195 were 1958 models.
  • Mark 55 models were Manual Starting, Short Shaft.
  • Short Shaft, Electric Starting with Alternator Mark 55E models were also produced.
  • Mark 55L manual start Long Shaft models were produced in 1956 and 1958.
  • Mark 55EL Long Shaft, Electric Start with Alternator models were produced in 1956-57-58.
  • Mark 55S Short Shaft Electric Start without alternator models were produced in 1958.
  • Ser# 906752-977517 require the reuse of the original top plate casting #25474 to support the starter mounting bolts.