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Old 29 May 2012, 00:52   #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, 00:53   #2
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Old 29 May 2012, 01:43   #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, 08:41   #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, 11:12   #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, 11:37   #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, 01:52   #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, 02:07   #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, 04:42   #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, 06:00   #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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Old 31 May 2012, 08:10   #11
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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?).
As far as I know increasing the oil ratio will just foul up the plugs, I just stick to that is recommended!
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Old 31 May 2012, 08:40   #12
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Folks are always going to have different opinions on this Max. My Mariner 15 says 100:1 private use and 50:1 commercial use. There must be some advantage to 50:1 for heavier use or they wouldn't advise it. So I run at 75:1. Keeps me happy and never foul the plugs, even on the river at 5mph which is not far off tickover for hours at a time.

Having said that the Yamaha handbook you linked doesn't mention commercial use so perhaps they reckon they've cracked it at 100:1 for all useage types.

BTW noted the running in is at 25:1 for 10hrs with no mention of different plugs so I guess they will cope with more oily fuel if you want.
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Old 31 May 2012, 17:34   #13
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Excellent little engines.

Have run these engines for years and never had problems with them. They are so much lighter and better suited to small boats than their modern 4 stroke replacements and as long as you don't run at full power a lot they are almost as economical.

Never gas any major problems with them having used 10 of them over the years for work apart from a spring going on one of the gear selectors. Easy enough to replace and only £4 for the part.

Always run them at 100:1. Adding more oil does nothing but produce more smoke and clog up spark plugs.

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Old 01 June 2012, 01:49   #14
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Excellent, thanks all. Picked it up last night so weather permitting we'll be on the water this weekend with a bit more ommmph than the Twatsoo...
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Old 01 July 2012, 08:40   #15
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I run mine at a 100 to 1 ratio and it performs wonderfully, these are great engines, really reliable.
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Old 01 July 2012, 14:17   #16
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hi all,

looking for an outboard that is under 11kwatt of power - been told that s 15 is 11.2 kWatt.

Any suggestions - new or second hand.
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Old 01 July 2012, 19:11   #17
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hi all,

looking for an outboard that is under 11kwatt of power - been told that s 15 is 11.2 kWatt.

Any suggestions - new or second hand.
Any particular reason? If you're thinking of 'bucking the rules' the Merc 10hp 2 strokes are the same as the 15hp bar the carbs
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Old 02 July 2012, 06:47   #18
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The boat is licencee states mac 14 kW I been told by mate so he looking for a engine that is as close as possible...
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