Yamaha 5BS L661 Owners/Repair Manual

Discussion in 'Outboards' started by Padmack, Jun 5, 2018.

  1. Padmack
    Joined: Apr 2016
    Posts: 9
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: IRL

    Padmack Junior Member


    I am looking for an owners or repair manual (general maintenance) for the above. I have trawled the net but have been unable to find a reliable lead. Since the engine seems to be 1980s vintage then I assume an electronic version may not exist. I would be happy to pursue the channel of buying a manual hardcopy, if I can find one.

    I simply want the accurate and type-specific info regarding stripping down and rebuilding as general pointers for other outboard types may mislead me or I might miss something. I like to do things right rather than blunder in and end up with a box of loose parts. The engine is a good runner but I want to clean her up and keep her running so the urgency is off at the moment.

    Any help here would be good.

    Kind regards
  2. activated
    Joined: Aug 2018
    Posts: 2
    Likes: 0, Points: 1
    Location: Lithuania

    activated New Member

    I have the same problem with manual. This outboard is made since '73 (Products History - History | YAMAHA MOTOR CO., LTD. https://global.yamaha-motor.com/about/history/products/). My outboard is like new inside, just outside is a bit scratched. Week ago i changed gaskets on the propeller shaft and added new oil. Today i got new spark plug(old was NGK BP6HS, bought the same). Now it is starting and going fine(was a problems with idling and statring). Had a problem with handle, repaired it today(cable tension was faulty). I will try to fully restore it in winter, because no time now.
    I have i problem with spark plug cable, its just bad(i think very old.. the rubber is dead). If i touch the "ground" and the cable- it cuts. I need a new one and i dont know where... Will try to insulate the cable with some electric resistant tape, but i dont think it would help.

    About oil change in transmission:
    There are 3 bolts, top one is oil level bolt, bottom one is for "pulling out" old oil and adding new one. The middle bolt i dont know... I made new seals on those 3 screws myself.
    I changed rubber cover seal, got new one, and used loctite sealant to be sure. Changed bearing too.
    The cost is miserable. ~3 euros bearing, 3euros for gasket each, new seals for 3 bolts ~0.5euro+work with scissors.

    Any help would be very nice...

    Sorry for my bad English, not native.
  3. Mr Efficiency
    Joined: Oct 2010
    Posts: 10,390
    Likes: 1,039, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Is that the air-cooled 5 hp engine ? I'm pretty sure that one was also sold under the Mariner brand for some years, and there may have been other brands as well, but I would be looking at Mariner in particular.

  4. activated
    Joined: Aug 2018
    Posts: 2
    Likes: 0, Points: 1
    Location: Lithuania

    activated New Member

    Yes its air-cooled. I found it in boats.net. I checked visuals, looks the same like my yamaha 5bs 661. Here is the link, may be useful for someone. Mercury - Outboard Parts by Year (Mercury, Mariner, Mark, Force, Chrysler, Sears, SportJet) - Mariner Outboard - 1977 - 7005207 OEM Parts - Boats.net https://www.boats.net/catalog/mercury/outboard-by-year/mariner-outboard/1977/7005207

    Thanks fof help.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.