Smoky Outboard

Thanks for all of your responses they really are much appreciated. Sounds like I haven’t done anything wrong but would be a good idea to get it serviced and impeller changed. Can I ask another question whilst I have you all??!! Just above where I was pointing there are a couple of holes (one either side)….what are these? Do these need to be under water when running?? See photo attached - they are slight hidden behind another part which sticks out. Very technical here I know! Many thanks.
 
There is normally a breeze on a river or you are moving through the water so the smoke does not accumulate. It always does at home in a water butt. Many the time I have stepped back when testing and thought you had better not breath that crap in but I am a two stroke Junky and have a total of 6. To save any negative comments the biggest container ships are two stroke and basically burn heated crude oil when crossing oceans so I do not think my 6 two strokes when occasionally being used are destroying the planet.
 
andsarkit said:
I have a Yamaha 15 2T which is possibly quite similar. ( there was a lot of badge engineering on outboards). The pee hole should produce a strong jet of water and I found it blocked quite easily. You might be able to remove the cover and see a pipe feeding the pee hole which you can pull off to see if it improves the flow. You can feel the side of the engine to see if it is overheating. It should be obvious if the smoke is steam as you will not get a water flow at that point. I always carry a piece of wire to clear the pee hole if it becomes blocked which I think comes from internal corrosion of the aluminium parts.
I doubt that you have damaged the engine as the smell of an overheated engine is quite noticeable and you have only run it for a short time under no load.
It is quite normal for the water in the tank to get quite oily as said above, this was why they were discontinued. My engine from about 1985 has 100:1 written on the side but I have always run it on TCW3 oil at 50;1 as I think this improves engine life.
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Quite often the 'pee' hole just indicates that the water pump is working and is nothing to do with water circulating round the engine block.
 
I have a 15 ho Marinar, but I also have a Suzuki 16 ho that had a hole in the exit of the cooling fines that would exit through the ger linkage and not via the pee hole Tis causes extra smoke in still air.

I fixed it by removed the power head and blocking the extra hole in the power head and water would then cone out the pee hole and less smoke
 
chriskeeler1982 said:
View attachment 199143These are the holes I was wondering what they are, what they do? Just above where the impeller is. Thanks again for the replies.
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On some Yamaha outboards there are rubber blank plugs filling holes in the leg, usually there for access to gear linkages etc.
 
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Boathook said:
Quite often the 'pee' hole just indicates that the water pump is working and is nothing to do with water circulating round the engine block.
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You could be right but this is the water circulation diagram for the Yamaha 15 which may be similar to the Mariner 15.
1757417930697.jpeg
The pipe on the left leads to the pee hole and on mine if this blocked the engine would overheat. Anyway it is a good indication that the impeller is working.
 
chriskeeler1982 said:
Hi, sorry if this has been covered but I need some friendly advice. I have just bought a second hand Mariner 15hp 2 stroke engine about 20 years old. I’ve taken the engine home, filled my wheelie bin and mounted the engine. Filled the external tank with 10 litres unleaded from the petrol station and mixed in 200ml of 2 Stoke outboard oil.

When I came to start the engine it took a good 20 pulls to start but then turned over. It ran well and has continued to do so, now when I stop it, it starts on the first pull. The engine seems to tick over well and goes into forward and reverse. My issue is with lots of white smoke from the engine….comes from around the back of the engine. I don’t know what’s wrong and just checking I’ve done nothing wrong. I went back to the seller to question him and he said I’ve run it dry and broke the engine! I have also noted it leaves the water in the bin very oily and now I have stored the engine inside it smells heavily.

Have I done anything wrong? Can anyone advise what the issue maybe? How much water does the engine need to be sat in…have I run it dry?!

Many thanks.
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We have a Mariner 5hp 2-stroke which must be 15 - 20 years old. It smokes a lot as well, but starts on second or third pull and runs like a dream. We've been doing 50:1 but have been progressively running it leaner and it's not too bad.
 
RogerFoxTerrier said:
We have a Mariner 5hp 2-stroke which must be 15 - 20 years old. It smokes a lot as well, but starts on second or third pull and runs like a dream. We've been doing 50:1 but have been progressively running it leaner and it's not too bad.
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If you do some googling, you can find a yamaha page suggesting that 50:1 is the sweet spot. Any less that 50:1 and you increase engine wear
 
chriskeeler1982 said:
Clive, that’s interesting, thank you. It does seem to run well apart from the smoke so that is definitely worth looking into. Is it relatively standard for the water it sits in to become quite oily on the surface?
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DO NOT RUN 100-1 MIX !!!

Outboard co's tried 100-1 to try and combat the Eco warriors but ended up reverting the original 50-1 mix.

In a bin - the 'smoke and oily' will accumulate and look worse ... its worth trying it on the water and moving ...

As to 'seller' comment - it may be why he sold it !!
 
Refueler said:
DO NOT RUN 100-1 MIX !!!

Outboard co's tried 100-1 to try and combat the Eco warriors but ended up reverting the original 50-1 mix.

In a bin - the 'smoke and oily' will accumulate and look worse ... its worth trying it on the water and moving ...

As to 'seller' comment - it may be why he sold it !!
Click to expand...
It’s definitely more ecologically sound to make your machinery last as long as possible🤣
 
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