Larson 4 HP 1 cylinder outboard

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  • WARREN PINNEY

    US Member - 1 Year
    Replies: 2
    Topics: 2
    #252556

    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?


    crosbyman

    Canada Member - 2 Years
    Replies: 2717
    Topics: 269
    #252558

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

    Joining AOMCI has priviledges 🙂


    Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #252560

    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!


    jcrigan

    US Member - 2 Years
    Replies: 522
    Topics: 33
    #252831

    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?


    WARREN PINNEY

    US Member - 1 Year
    Replies: 2
    Topics: 2
    #252834

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


    The Boat House


    Replies: 3795
    Topics: 95
    #252854



    Does it look like this motor?
    Tubs


    WARREN PINNEY

    US Member - 1 Year
    Replies: 2
    Topics: 2
    #252929

    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?


    Steve A W

    US Member - 2 Years
    Replies: 714
    Topics: 47
    #252933

    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


    lauson73


    Replies: 16
    Topics: 10
    #253031

    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


    Steve A W

    US Member - 2 Years
    Replies: 714
    Topics: 47
    #253073

    Doug

    Email sent.

    Thanks

    Steve A W

    Member of the MOB chapter.
    I live in Northwest Indiana

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