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I have a mercury 20 HP serial number og352431 is it 2 or 4 stroke

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Year of serial #0D122790 mercury motor 2.5


You'll find a tag on your bracket.
The upper numbers you'll find your serial number,
Then in the 'box' just below the 4 digits indicating the production year.
Is it a 2.5Hp, or 2.5liter? Your serial is in the V-6 2-stroke 135-175 Xr range...

Sep 21, 2017 | Mercury Boating

1 Answer

I have a 20 hp mercury outboard serial#06082001.I want to know what year it is and if it's 2 or 4 stroke


If you drop the first zero it would put it at 1981.

http://www.themarinedoctor.com/msn.pdf

this site gives a different answer, as 1980- 81, so close. It SUGGESTS it is a 4 stroke engine.

http://www.boats.net/parts/search/Merc2/Mercury/25%20%282%20CYL.%29%282-STROKE%29%28International%29/parts.html

It is likely a 4 stroke, but I won't give you a definitive answer, due to the damage it can cause with a guess!

A four stroke running with two stroke oil will just smoke, but a two stroke with no oil will seize and leave you stranded on the water with a seized engine!

A four stroke engine has valves operated by push rods or a pulley and a chain, a two stroke just has a head. Take a look at the engine and it should be obvious.

For your first service, I would suggest you go to a marine engineer. Ask all the questions, and get the right answers. When I had my 1986 Evinrude serviced, i typed a list of questions and left the list with him. i asked him when I picked up the boat and wrote the answers down. The first one was 'petrol to oil ratio and which is the best oil'. A basic service will cost you a hundred bucks and you will have some comfort that you are unlikely to break down, 6 miles offshore with only a paddle :)

https://www.google.ca/search?q=20+hp+mercury+outboard+serial%2306082001&ie=utf-8&oe=utf-8&gws_rd=cr&ei=uwm-WKjHK6SUjwSApJLQBw#q=mercury+outboard+serial+number+lookup&*

Mar 07, 2017 | Mercury Boating

1 Answer

What year is a mercury 35hp outboard motor with serial number2491265.Is the motor 2 or 4 stroke


the serial number begins 2487558 and continues past 2491265 and as the beginning serial number denotes the year , your engine is 1969 model
it shows as a 2 stroke with auto oil injection
check the heads
if the plugs are in the flat of the head and there are no rocker covers it is 2 stroke
talk with a mercury /mariner service center

Sep 25, 2016 | Mercury Mariner Starter, Outboard, 35-40...

1 Answer

What is the shaft length of my 1998 mercury tracker outboard Serial number OG676641


Measure from the cavitation plate (the one above the prop) to the u bend where the motor hangs on the transom. They are usually considered 15", 20", 25".

Nov 02, 2014 | Boating

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Serial number decode0B142498


Go to boats.net - Mercury parts - search under hp/serial range - select 20hp 2 cylinder - it will be under the first selection 0A730007 and up.

Aug 24, 2014 | Seloc Mercury Outboard Engine Repair...

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75 horse power ercurywhat year of manufacture serial number 06255293


There is no data included in the serial number that gives info of what year the engine was made. You can, however look up the number here, and that will tell you the year of manufactor.

http://www.iboats.com/basics/serial_number_year.html#mercury

Aug 15, 2014 | Clymer Mercury/mariner 75-275 Hp...

1 Answer

I have mercury 50 hp 4 stroke thunderbolt serial no 2307966 any information


www.mercurymarine.com/parts-and.../parts-catalog

4 stroke cycle? More likely two stroke cycle with oil injection.

Jun 13, 2014 | Computers & Internet

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