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Old 10 April 2013, 16:42   #1
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Mariner 25 hp

Hi can anybody confirm the year of manufacture of my mariner outboard The outboard is a mariner 25 hp 2stroke serial number op137390 I believe it's one of the last 2strokes ? Trying to get the correct service parts and also find the correct fuel oil mix, previous owner stated 1% oil ie 100: 1 there is a fairly original looking sticker on the motor stating 1% may be being paranoid but always been 50:1 on other 2strokes I've owned ,and have seen a user manual online stating 50: 1 ( may be an earlier manual ) Also spark plugs NGk b7 hs 10 listed in the manual but NGk bpz8h 10 in the motor at the moment Any help would be tops thanks
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Old 11 April 2013, 04:08   #2
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Country: UK - England
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Your obm will be 50:1 fuel mix, as for the spark plugs you will probally find on the epc that there are about half a dozen that you can use, but any merc/mar dealer on here will be able to tell you
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Old 13 April 2013, 18:16   #3
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
That brand model could be a disguissed Tohatsu same HP horse, if so any Tohatsu part will fit and you can pass that horse to a 30 HP for peanuts cost. Check if same as pic. And the correct fuel/oil ratio is 50:1.

Happy Boating
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Old 13 April 2013, 20:12   #4
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Country: Australia
Town: Melbourne
Boat name: Shark attack
Make: Stacer
Length: 3m +
Engine: 30hp Outboard
Join Date: Apr 2010
Posts: 19
It's a made in USA motor not the Japan made Tohatsu, can tell that from the pictures you've put up. Cowl looks the same as a 1998 model but parts for this should be interchangeable between years as they didn't update the motor design. Fuel:oil mix is 50:1 and parts should be available through a Mercury dealer (This engine and the Mercury 25hp USA model were identical bar the cowl paint/decals).
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Old 14 April 2013, 08:35   #5
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
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As joey 1987 mentions above, if it's the motor on the Honwave in your album pics, then it's '97/98 ish.

I'd mix the oil 50:1, as uncle al suggests.

For part numbers, look here:

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

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Old 14 April 2013, 11:48   #6
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The power head has the word Mercosil 872-9076-c14 cast into it so doese this point to japanise usa or eroupe ? Cheers guys
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Old 14 April 2013, 18:11   #7
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Country: UK - Wales
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It's a Merc, not a Tohatsu - could be made in USA or Belgium. Should say on the Serial Number badge on the saddle.

The link I posted earlier will give you part numbers for any bits you need.
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Old 15 April 2013, 03:50   #8
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Its a merc/mar obm from Belgium, as identyfied by its serial number.Much used by the MOD
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Old 15 April 2013, 16:56   #9
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Thanks for all your help guys ! SORTED!!!!!
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