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Old 29 May 2012, 01:52   #1
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Yam 15hp advice please

Hi guys, I'm going to look at a Yamaha 15hp 2 stroke this week - currently running a 9.8 Tohatsu which I'm very familiar with but not the Yams. Any tips please on viewing?

Just to confirm the 'S' on the label makes it a short leg? And the year is '99? Was this the last model of the 2 stroke 15's or was there a later one? Was the cowling colour and graphics always the same?
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Old 29 May 2012, 01:53   #2
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Old 29 May 2012, 02:43   #3
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Yep, that was the last model of Yamaha 2 stroke. Colours are still current (Blueish Grey Metallic ). Fantastic engine, ran the 9.9hp version on a Zodiac SR310, at 37kg its light for a 15hp and the gear shift on the tiller is a nice touch.

No known problems, just check the usual, tell tail, prop damage etc.
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Old 29 May 2012, 09:41   #4
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Thanks for that. And double checking this is the short shaft?

Anyone else chip in any tips for maintainance, or link to a workshop manual etc please?
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Old 29 May 2012, 12:12   #5
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Thanks for that. And double checking this is the short shaft?

Anyone else chip in any tips for maintainance, or link to a workshop manual etc please?

try ebay for CD manual, only a few , but check that it covers your engine, I have one of the CD manuals which does not have my exact model ( going by the letters after the hp ) but its is still useful.
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Old 29 May 2012, 12:37   #6
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I did find the owner's manual below (obvious place to look really... ):

Owners Manuals | Yamaha Outboards
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Old 31 May 2012, 02:52   #7
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Any other Yam owners confirm the best oil ratio to use? I believe the manual states 100:1 wheras my Tohatsu is 50:1. Is there a case for running the Yam 50:1? Is this recommended anyway for commercial use?
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Old 31 May 2012, 03:07   #8
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Any other Yam owners confirm the best oil ratio to use? I believe the manual states 100:1 wheras my Tohatsu is 50:1. Is there a case for running the Yam 50:1? Is this recommended anyway for commercial use?
My 1997, 75 Yam commercial is 50:1.
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Old 31 May 2012, 05:42   #9
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Any other Yam owners confirm the best oil ratio to use? I believe the manual states 100:1 wheras my Tohatsu is 50:1. Is there a case for running the Yam 50:1? Is this recommended anyway for commercial use?

I run mine on 100.1 never had a problem sweet little engines love mine wife & kids are happy to use it too!
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Old 31 May 2012, 07:00   #10
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Thanks Nick, you've had more than a few engines I guess - is there any disadvantage to running on 100:1 - cost is negligable but is it a case of more oil is better or worse. Not that I'm cynical but maybe Yamaha quote 100:1 to give perceived lower running costs/less emissions etc. If commercial users are advised 50:1 there must be a reason (less wear?).
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