Logo
Results 1 to 2 of 2
  1. #1

    Default Need year hiawatha 5hp, model 350mi25-7973b, serial 481485

    JUST GOT IT, WHAT YEAR IS IT?, GAS & OIL RATIO? USING TODAY'S 2-CYCLE OIL - ON MOTOR SAYS 1/2 Pt SAE 30 @ GALLON. WHICH IS BEST OIL TO USE? CAN I DOWNLOAD A MANUAL SOMEWHERE? THANKS MUCH. RETIRED.

  2. #2

    Default Re: Need year hiawatha 5hp, model 350mi25-7973b, serial 481485

    Quote Originally Posted by JB2014 View Post
    JUST GOT IT, WHAT YEAR IS IT?, GAS & OIL RATIO? USING TODAY'S 2-CYCLE OIL - ON MOTOR SAYS 1/2 Pt SAE 30 @ GALLON. WHICH IS BEST OIL TO USE? CAN I DOWNLOAD A MANUAL SOMEWHERE? THANKS MUCH. RETIRED.
    It would be a 1955, in 1956 Scott started making the Hiawatha and has different model number sequence. I HIGHLY recommend that you run the 16:1 oil ratio. I have one of these outboards that my father bought in 1955 and that is what I run in it now. I use Pennzoil 2-cycle marine and have trolled for hours without fouling the plugs. These engines are designed for heavy lubrication and anything with a higher ratio will lead to overheating and damage. Replacement parts for these motors are hard to come by, don't risk damage. Run 100% gasoline. The float in the carburetor is coated with shellac, ethanol will dissolve this shellac causing gumming of the jet and float failure. Always run the carburetor dry before storage by closing the needle valve below the air-fuel mixture knob and allow the engine to die. By following these few simple rules, this motor has run every year for 60 years.

Similar Threads

  1. mariner 8 serial' (647 S 23889) year model??
    By scooters in forum Identifying Model / Year / Horsepower
    Replies: 12
    Last Post: 02-08-2011, 05:12 AM
  2. Lookup Nissan model year with serial number
    By jc_uf_itk in forum Nissan Tohatsu Outboard Archive
    Replies: 1
    Last Post: 01-03-2009, 10:20 AM
  3. Evinrude serial G4113201 model amp year
    By gadus in forum Johnson Evinrude Outboard Archive
    Replies: 0
    Last Post: 06-21-2008, 10:59 AM
  4. No serial plate or model # what year it is
    By don57 in forum Johnson Evinrude Outboard Archive
    Replies: 5
    Last Post: 08-24-2007, 11:30 AM
  5. Find engine model year by serial #
    By russ0943 in forum Mercruiser Sterndrive Archive
    Replies: 9
    Last Post: 06-26-2006, 10:09 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •