Larson 4 HP 1 cylinder outboard
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- This topic has 9 replies, 7 voices, and was last updated 2 years, 2 months ago by Steve A W.
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January 7, 2022 at 8:09 pm #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?
January 7, 2022 at 8:18 pm #252558is 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 #252560Warren, 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 #252831I 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 #252834It is a single cylinder Lauson, SN: 70B7480 no other markings. May be less than 4 HP.
January 13, 2022 at 9:43 am #252854
Does it look like this motor?
Tubs
January 14, 2022 at 9:26 pm #252929Thanks. 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 #252933Thanks. 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 IndianaJanuary 19, 2022 at 10:35 am #253031I 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
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