Larson 4 HP 1 cylinder outboard

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  • January 7, 2022 at 8:09 pm #252556
    WARREN PINNEY
    Participant

      US Member

      I recently acquired a 1 cylinder 4 cycle outboard. I am looking for a maintenance manual and rear lower over. Can anyone help me out?

      January 7, 2022 at 8:18 pm #252558
      crosbyman
      Participant

        Canada Member - 2 Years

        is it a 4hp running on 1 cyl or a 1 cyl running as a 4 stroke ?

        Joining AOMCI has priviledges 🙂

        January 7, 2022 at 8:51 pm #252560
        Buccaneer
        Participant

          US Member

          Warren, I have a pdf file for the Lauson S350 / 351 but it’s too
          large to upload here.
          If you PM me your email I could try to send it via “We Transfer” online.

          Prepare to be boarded!

          January 12, 2022 at 7:08 pm #252831
          jcrigan
          Participant

            I think he may have the earlier 410 model. That’s a 2.5hp motor and is different from the later S 300 line of motors. Is the lower cover cast aluminum or stamped?

            January 12, 2022 at 10:31 pm #252834
            WARREN PINNEY
            Participant

              US Member

              It is a single cylinder Lauson, SN: 70B7480 no other markings. May be less than 4 HP.

              January 13, 2022 at 9:43 am #252854
              The Boat House
              Participant



                Does it look like this motor?
                Tubs

                January 14, 2022 at 9:26 pm #252929
                WARREN PINNEY
                Participant

                  US Member

                  Thanks. You are right That looks like it. Probably a model 410, 2.5 HP with a rope start motor. The rear back cover is missing, can I operate it without fear of it overheating?

                  January 14, 2022 at 11:47 pm #252933
                  Steve A W
                  Participant

                    US Member - 2 Years
                    WARREN PINNEY wrote:

                    Thanks. You are right That looks like it. Probably a model 410, 2.5 HP with a rope start motor. The rear back cover is missing, can I operate it without fear of it overheating?

                    No.
                    You can maybe barrel run it for a little while;
                    Without the cover in place it will overheat.

                    Member of the MOB chapter.
                    I live in Northwest Indiana

                    January 19, 2022 at 10:35 am #253031
                    lauson73
                    Participant

                      I am the Lauson  person listed in the Antique Outboader Magazine and I have all parts and repair manuals for

                      every model of Lauson. I have close to thirty of these Lausons and many parts motors. I have the cowl,

                      and you need the cowl for correct air cooling.

                      Send me your email and I will get you the Manual or call me @ 541 948 0866

                      Doug Grell

                      Lauson 73

                      January 19, 2022 at 8:00 pm #253073
                      Steve A W
                      Participant

                        US Member - 2 Years

                        Doug

                        Email sent.

                        Thanks

                        Steve A W

                        Member of the MOB chapter.
                        I live in Northwest Indiana

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