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Old 22 June 2013, 02:33   #1
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Uprating a 2010 9.9hp Mariner to 15hp

Hi all

I'm looking for some advice on a 2010 9.9 HP outboard. Is it possible to uprate this engine to a 15 HP? If so what are points are for consideration ie cost etc

If this isn't possible on a mariner 9.9 are there any other 9.9 HP outboards that can be uprated in HP?

Thanks in advance for your advice!
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Old 22 June 2013, 03:14   #2
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If its a four stroke you won't be able to. It shares the same block as the 8hp. The 15/20 are a different engine.
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Old 22 June 2013, 03:21   #3
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Thanks samt.

Just checked the engine specs....should have done so first!

Thanks anyway:-)
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Old 22 June 2013, 04:10   #4
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does this mean i can upgrade my 15 2s to a 20 ?
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Old 22 June 2013, 04:27   #5
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If its the current four stoke model then with the right bits, yes.

Edit. Re-read your post, you can't with the 15 2 stroke as the 20hp was a derated 25hp. Although i think mariner did do a 'super' 15 which came from the same engine as the 20/25 two stroke. Never seen one though.
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Old 22 June 2013, 04:34   #6
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cheers for that ,back to the drawing board then lol
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Old 24 June 2013, 16:45   #7
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You can upgrade a 9.9 to 15 on most 2 strokes engines if being same CC, some more easier and friendly to upgrade, others needs more parts change to match 15 HP versions. If the Mariner Super 15 it's same as the newer Merc Super 15 version, which are rebadged Tohatsu cowls, are 18 HP in reality. Fancy names, marketing issues...

Happy Boating
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Old 24 June 2013, 19:01   #8
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Super 15s are the same as the 2-stroke Merc 20/25, 2-cyl motor.
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Old 24 June 2013, 19:39   #9
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Newer rebadged 2 strokes Merc's doesn't have a intermediate 20 HP between 18 & 25, unless sold as a Yam rebadged version. Check 15 HP Super under specs : Mercury Marine 294 CC being same as 18 Tohatsu version. The standard 15 has only 262 same as the 9.9 restricted model. Assume HP Versions could vary from market to market depending which is the manufacturer.

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Old 24 June 2013, 19:53   #10
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This one:

MERCURY : 25, 25 SEA PRO, SUPER 15 (2 CYL.) : 0P017000 THRU 0P325499 - Performance Product Technologies

Super 15, 25 & 25 Sea Pro. Same as the earlier Merc 20/25. 400cc twin.
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