Page 1 of 3 123 LastLast
Results 1 to 10 of 21
  1. #1
    Join Date
    Mar 2004
    Posts
    896

    Default Weight of an outboard - 8hp to 15hp

    Hi All,

    Currently we use an 8hp Yamaha as an auxilliary (mid 90's motor) for the boat and tender.

    I have been offered a 15hp Yamaha of a similar vintage. Does anyone know how much heavier it is??

    I can lift the 8hp ok, and could manage a couple more kilos - but if it's double then no chance.

    Cheers
    Why can't we work 2 days a week and boat the other 5????

  2. #2
    Wiggo's Avatar
    Wiggo is offline Registered User
    Location : In front of the bloody computer again
    Join Date
    Sep 2003
    Posts
    5,527

    Default Re: Weight of an outboard - 8hp to 15hp

    It's likely to be at least 50% heavier at a guess. Usually the 6 and 8 hp models shared a block and the 10 and 15hp ones used the next size up. 8hp was manageable to lift on and off, but I doubt 15 would be so, at least not on a regular basis (I did once lift a 60hp ELPTO Mariner on and off by hand, but that's not something I would repeat voluntarily).
    The nicest thing about not planning is that failure comes as a complete surprise, and is not preceded by a period of worry and doubt.
    <span style="color:blue">
    http://www.nereid-charter.com
    </span>

  3. #3
    jfm's Avatar
    jfm is offline Registered User
    Location : London/Antibes
    Join Date
    May 2001
    Posts
    17,496

    Default Re: Weight of an outboard - 8hp to 15hp

    I had the yam 15hp 2 stroke, a 2002/3 model, from 2002-2004 (and since then it's still in the family - it's on my brother's boat). Really nice engine. I had it permanently on the tender so didn't lift it off, but it wasn't tiny and so I'd agree Wiggo's comment that it isn't likely to be an easy lift, at sea. As Wiggo says it uses a bigger block than the 8. I have photos somewhere, - do you want me to put them here so you can see the physical size of it?

  4. #4
    Join Date
    Mar 2004
    Posts
    896

    Default Re: Weight of an outboard - 8hp to 15hp

    Yeh this was my thinking too.

    The tender is rated to 10hp but as I will put a lower pitch prop on it to use as an auxiliary on the main boat, I figure it would be relatively safe on the tender as long as I don't go daft. The big advantage of the 9.9 &amp; 15 is that they have a thru hub prop and I can fit a piranah plastic prop to it to have a variable pitch.

    I've asked the guy to put it on some bathroom scales for me to get the weight but he says he doesn't have any.

    Anyone got one of these they can pop on some scales for me to see what it weighs??

    My 8hp is a longshaft, this is a s/shaft, so I don't know if that makes a lot of weight difference?

    Thanks all
    Why can't we work 2 days a week and boat the other 5????

  5. #5
    jfm's Avatar
    jfm is offline Registered User
    Location : London/Antibes
    Join Date
    May 2001
    Posts
    17,496

    Default Re: Weight of an outboard - 8hp to 15hp

    Here are the pics (from summer 2003!)...



  6. #6
    Join Date
    Mar 2004
    Posts
    896

    Default Re: Weight of an outboard - 8hp to 15hp

    I've seen pics Wiggo thanks.

    I will probably leave it on the tender 90% of the time as we tow the tender as it's a bit big for the swim platform so we tend to go most places at displacement speeds.

    My concern is that if we do a long passage I want to be able to put the o/b on the swim platform and the tender on the bow - and although I wouldn't be trying that at sea - it does potentially seem a bit heavy for the lift

    Mind you the 8hp l/shaft isn't light either, and it's all about technique. Perhaps I could rig up some sort of temporary winch/lift to haul it onboard - however if it's 50% heavier as suggested then I think it would just be too heavy for the relatively flimsy swim platform not to mention the weight all going over to one side of the boat.
    Why can't we work 2 days a week and boat the other 5????

  7. #7
    Wiggo's Avatar
    Wiggo is offline Registered User
    Location : In front of the bloody computer again
    Join Date
    Sep 2003
    Posts
    5,527

    Default Re: Weight of an outboard - 8hp to 15hp

    It's difficult to be exact as all the small stuff is 4 stroke now, but for example:

    Tohatsu 4/5/6hp - 25kg
    Tohatsu 8/9.8 hp - 37kg
    Tohatsu 15hp - 52kg

    So a 50% weight increase sounds to be in the right ballpark. Depending on the boat, you could rig up an outboard lift:

    http://www.force4.co.uk/563/Force-4-...ine-Davit.html

    That would certainly get the thing on and off...
    The nicest thing about not planning is that failure comes as a complete surprise, and is not preceded by a period of worry and doubt.
    <span style="color:blue">
    http://www.nereid-charter.com
    </span>

  8. #8
    Join Date
    Mar 2004
    Posts
    896

    Default Re: Weight of an outboard - 8hp to 15hp

    I could make something like that up quite easily.

    If I made it nice, it might be a better way to store the thing as well as I could keep it in the middle and further forward than it hanging off the swim platform.

    One of the reasons I don't want a 4stroke is the extra weight, plus they are harder to lie down.

    I'd love one of the Tohatsu 9.8 2 strokes - apparently they were about 26kg and 10hp - that would be perfect!

    The 15hp you've put in the pics is a newer model than I am looking at - how do I post a pic of it here??

    Thanks
    Why can't we work 2 days a week and boat the other 5????

  9. #9
    Join Date
    Mar 2004
    Posts
    896

    Default Re: Weight of an outboard - 8hp to 15hp

    How do I post a piccy here?
    Why can't we work 2 days a week and boat the other 5????

  10. #10
    Join Date
    Mar 2004
    Posts
    896

    Default Re: Weight of an outboard - 8hp to 15hp

    Guy has just come back to me.

    It's 5stone - which I make 31KG

    That doesn't sound impossible to manage. I will weigh the 8hp tonight, but I reckon that's do-able as the new 4strokes are coming in around that for an 8hp!
    Why can't we work 2 days a week and boat the other 5????

Bookmarks

Posting Permissions

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