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I need to know the year, and is it a 2 stroke or four stroke Mercury 5hp Serial # 0A829188.

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If it has a rocker cover , it is 4 stroke
if the plug goes intio the head that is flat mounted on the cylinder ./block then it is 2 stroke ask you service dealer to determine the year as they have the books

Posted on May 12, 2017

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Posted on Jan 02, 2017

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I have a mercury outboard with serial # 5636683. Can you give me the shaft size of the motor?


Hey Robert,
What motor do you have?.. Size, year, two stroke/four stroke..etc.. and what shaft are you talking about?
Mercury Outboard Manuals by Seloc 1965 2014

Jul 18, 2017 | Mercury Boating

1 Answer

1998 1150412UD Mercury Outboard - is it 2 or 4 stroke


If it has an oil compartment, it has to be a two stroke. There is a rough and ready way to check. A four stroke engine has a compression stroke on every four strokes, whereas a two stroke has compression stroke on EVERY upward stroke of the piston. Remove the spark plugs, and turn the engine until you see the piston. Put your finger over the plug hole and turn the engine one revolution. Do you get compression? Keep turning, do you get suction and then compression again. If so it is a two stroke.

you can also follow the pipes from the oil tank and see where they go to? Yours should have a pipe from the pump to the carburetor inlet manifold.

On a new boat though, my advice for you is to take the boat and engine to a marine engineer for a service. The cost is minimal and you will get everything set up for the season, especially the carbs. You can ask lots of questions. The cost is about $150 and is well worth the piece of mind that you are not going to break down.

The critical bit you have missed from your post is the HP. If you Google

Mercury HP Serials

and you will end up at a site with engine details. Then google the same, but manual instead of serials. If you know the year of the boat, add that before 'Mercury'.

Use Evinrude XD50 two stroke oil. It is expensive but the best in clean running, non fouling and lack of acrid fumes. One $48 jug will last a season and a bit if you go out twice a week as I do. My boat goes to the marina on Wednesday :>)

Google

May 29, 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

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

1 Answer

What year is my mercury 50 four stroke, serial # OG292490


It is a 1996, the O stands for oil injected and the rest is the serial number.

Jan 05, 2011 | Boating

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