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Old 27 December 2013, 12:38   #1
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Country: UK - England
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What model ? Age etc

Having bit trouble in working out model age etc as the 90hp ob does not have serial plate on. Need to establish this so order right wiring harness for tacho to 703 controls etc

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Old 27 December 2013, 14:26   #2
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Just going by cowl it could easily be around mid '80s to mid '90s. I had a Yamaha 25D with exactly the same design and decals (digital-style hp number decals) and it was 1986. I also had a Yamaha 40hp (1995) and although the number style is the same the side decals changed to a simpler design.
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Old 27 December 2013, 14:39   #3
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The age is normally on a black sticker on the port side of the outboard bracket, it will have a model number and on the bottom right of the sticker it will have a letter, this is the letter which tells you the age...



However if this sticker isn't on there I'm not sure if the age will be anywhere else on the outboard.

Do you have a serial number on the rib? the last two numbers normally tell you the age and that could be an indication if it's the original engine.
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Old 27 December 2013, 14:54   #4
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Defo no plates and engine plate is not on, basically all this is needed so chandler can order right tacho loom (other post) don't seem to be getting far
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Old 27 December 2013, 14:56   #5
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Quote:
Originally Posted by whisper View Post
The age is normally on a black sticker on the port side of the outboard bracket, it will have a model number and on the bottom right of the sticker it will have a letter, this is the letter which tells you the age...



However if this sticker isn't on there I'm not sure if the age will be anywhere else on the outboard.

Do you have a serial number on the rib? the last two numbers normally tell you the age and that could be an indication if it's the original engine.

Like this.



The 'T' tells you it's a 1995 engine but, like every other second-hand (sorry, 'pre-owned') engine, it had only done 200 hours when I bought it, according to the seller!
Joking aside, it's in fabulous condition and being one of the three cylinder Yamahas, it's a bulletproof piece of engineering excellence. I hope.
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Old 27 December 2013, 15:03   #6
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Yeah tony I'm missing the plates, this all so can sort gauges haha
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Old 03 January 2014, 18:45   #7
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What might be more help is a pic of the 'leccy connector inside the engine.

If push comes to shove A few pics of the inside of the engine might help - I am running a Merc off my Yam 703..... The electrics aren't spectacularly different in the world of 2- stroke.


I suspect a rewire would be pretty simple, but ask me again when I am little clearer headed.
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Old 03 January 2014, 18:57   #8
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The serial numbers also on a sticker on the Powerhead. May help get the age

Peter @ Boatsandoutboards4sale ~ www.BoatsandOutboards4Sale.co.uk ~ 07930 421007
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Old 04 January 2014, 03:49   #9
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There should be one of these discs somewhere on the power head with a 6 digit number on.

There should also be a 3 digit model number that will appear on a number of cast components. Something like '6H1'

If you can find these two, then I can tell you the year.
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